Lincoln Corsair Manuals

Lincoln Corsair: Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40 / Diagnosis and Testing - DTC Chart and Pinpoint Tests - 2.0L EcoBoost (177kW/240PS) – MI4

Lincoln Corsair 2020-2022 Service Manual / Powertrain / Automatic Transmission / Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40 / Diagnosis and Testing - DTC Chart and Pinpoint Tests - 2.0L EcoBoost (177kW/240PS) – MI4

Diagnostic Trouble Code (DTC) Chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).


Module DTC Description Action
PCM P0657:00 Actuator Supply Voltage 'A' Circuit/Open: No Sub Type Information GO to Pinpoint Test A
PCM P0657:00 Actuator Supply Voltage 'A' Circuit/Open: No Sub Type Information GO to Pinpoint Test F
PCM P0702:00 Transmission Control System Electrical: No Sub Type Information GO to Pinpoint Test J
PCM P0706:00 Transmission Range Sensor 'A' Circuit Range/Performance: No Sub Type Information GO to Pinpoint Test C
PCM P0707:00 Transmission Range Sensor 'A' Circuit Low: No Sub Type Information GO to Pinpoint Test C
PCM P0708:00 Transmission Range Sensor 'A' Circuit High: No Sub Type Information GO to Pinpoint Test C
PCM P0709:00 Transmission Range Sensor 'A' Circuit Intermittent: No Sub Type Information GO to Pinpoint Test C
PCM P0710:00 Transmission Fluid Temperature Sensor 'A' Circuit: No Sub Type Information GO to Pinpoint Test B
PCM P0711:00 Transmission Fluid Temperature Sensor 'A' Circuit Range/Performance: No Sub Type Information GO to Pinpoint Test B
PCM P0712:00 Transmission Fluid Temperature Sensor 'A' Circuit Low: No Sub Type Information GO to Pinpoint Test B
PCM P0713:00 Transmission Fluid Temperature Sensor 'A' Circuit High: No Sub Type Information GO to Pinpoint Test B
PCM P0715:00 Input/Turbine Shaft Speed Sensor 'A' Circuit: No Sub Type Information GO to Pinpoint Test D
PCM P0716:00 Input/Turbine Shaft Speed Sensor 'A' Circuit Range/Performance: No Sub Type Information GO to Pinpoint Test G
PCM P0717:00 Input/Turbine Shaft Speed Sensor 'A' Circuit No Signal: No Sub Type Information GO to Pinpoint Test D
PCM P0718:00 Input/Turbine Shaft Speed Sensor 'A' Circuit Intermittent: No Sub Type Information GO to Pinpoint Test D
PCM P0720:00 Output Shaft Speed Sensor Circuit: No Sub Type Information GO to Pinpoint Test D
PCM P0721:00 Output Shaft Speed Sensor Circuit Range/Performance: No Sub Type Information GO to Pinpoint Test G
PCM P0722:00 Output Shaft Speed Sensor Circuit No Signal: No Sub Type Information GO to Pinpoint Test D
PCM P0723:00 Output Shaft Speed Sensor Circuit Intermittent: No Sub Type Information GO to Pinpoint Test D
PCM P0729:00 Gear 6 Incorrect Ratio: No Sub Type Information GO to Pinpoint Test K
PCM P0731:00 Gear 1 Incorrect Ratio: No Sub Type Information GO to Pinpoint Test L
PCM P0732:00 Gear 2 Incorrect Ratio: No Sub Type Information GO to Pinpoint Test M
PCM P0733:00 Gear 3 Incorrect Ratio: No Sub Type Information GO to Pinpoint Test N
PCM P0734:00 Gear 4 Incorrect Ratio: No Sub Type Information GO to Pinpoint Test O
PCM P0735:00 Gear 5 Incorrect Ratio: No Sub Type Information GO to Pinpoint Test P
PCM P0736:00 Reverse Incorrect Ratio: No Sub Type Information GO to Pinpoint Test S
PCM P073D:00 Unable to Engage Neutral: No Sub Type Information GO to Pinpoint Test T
PCM P073E:00 Unable to Engage Reverse: No Sub Type Information GO to Pinpoint Test U
PCM P073F:00 Unable to Engage Gear 1: No Sub Type Information GO to Pinpoint Test V
PCM P0740:00 Torque Converter Clutch Solenoid Circuit/Open: No Sub Type Information GO to Pinpoint Test F
PCM P0741:00 Torque Converter Clutch Solenoid Circuit Performance/Stuck Off: No Sub Type Information GO to Pinpoint Test W
PCM P0743:00 Torque Converter Clutch Solenoid Circuit Electrical: No Sub Type Information GO to Pinpoint Test F
PCM P0748:00 Pressure Control Solenoid 'A' Electrical: No Sub Type Information GO to Pinpoint Test F
PCM P0751:00 Shift Solenoid 'A' Performance/Stuck Off: No Sub Type Information GO to Pinpoint Test X
PCM P0752:00 Shift Solenoid 'A' Stuck On: No Sub Type Information GO to Pinpoint Test Y
PCM P0753:00 Shift Solenoid 'A' Electrical: No Sub Type Information GO to Pinpoint Test A
PCM P0754:00 Shift Solenoid 'A' Intermittent: No Sub Type Information GO to Pinpoint Test A
PCM P0756:00 Shift Solenoid 'B' Performance/Stuck Off: No Sub Type Information GO to Pinpoint Test X
PCM P0757:00 Shift Solenoid 'B' Stuck On: No Sub Type Information GO to Pinpoint Test Y
PCM P0758:00 Shift Solenoid 'B' Electrical: No Sub Type Information GO to Pinpoint Test A
PCM P0759:00 Shift Solenoid 'B' Intermittent: No Sub Type Information GO to Pinpoint Test A
PCM P0761:00 Shift Solenoid 'C' Performance/Stuck Off: No Sub Type Information GO to Pinpoint Test X
PCM P0762:00 Shift Solenoid 'C' Stuck On: No Sub Type Information GO to Pinpoint Test Y
PCM P0763:00 Shift Solenoid 'C' Electrical: No Sub Type Information GO to Pinpoint Test A
PCM P0764:00 Shift Solenoid 'C' Intermittent: No Sub Type Information GO to Pinpoint Test A
PCM P0766:00 Shift Solenoid 'D' Performance/Stuck Off: No Sub Type Information GO to Pinpoint Test X
PCM P0767:00 Shift Solenoid 'D' Stuck On: No Sub Type Information GO to Pinpoint Test Y
PCM P0768:00 Shift Solenoid 'D' Electrical: No Sub Type Information GO to Pinpoint Test A
PCM P0769:00 Shift Solenoid 'D' Intermittent: No Sub Type Information GO to Pinpoint Test A
PCM P076F:00 Gear 7 Incorrect Ratio: No Sub Type Information GO to Pinpoint Test Q
PCM P0771:00 Shift Solenoid 'E' Performance/Stuck Off: No Sub Type Information GO to Pinpoint Test X
PCM P0772:00 Shift Solenoid 'E' Stuck On: No Sub Type Information GO to Pinpoint Test Y
PCM P0773:00 Shift Solenoid 'E' Electrical: No Sub Type Information GO to Pinpoint Test A
PCM P0774:00 Shift Solenoid 'E' Intermittent: No Sub Type Information GO to Pinpoint Test A
PCM P077D:00 Output Shaft Speed Sensor Circuit High: No Sub Type Information GO to Pinpoint Test D
PCM P0791:00 Intermediate Shaft Speed Sensor 'A' Circuit: No Sub Type Information GO to Pinpoint Test D
PCM P0792:00 Intermediate Shaft Speed Sensor 'A' Circuit Range/Performance: No Sub Type Information GO to Pinpoint Test G
PCM P0793:00 Intermediate Shaft Speed Sensor 'A' Circuit No Signal: No Sub Type Information GO to Pinpoint Test D
PCM P0794:00 Intermediate Shaft Speed Sensor 'A' Circuit Intermittent: No Sub Type Information GO to Pinpoint Test D
PCM P07C0:00 Input/Turbine Shaft Speed Sensor 'A' Circuit High: No Sub Type Information GO to Pinpoint Test D
PCM P07C6:00 Intermediate Shaft Speed Sensor 'A' Circuit High: No Sub Type Information GO to Pinpoint Test D
PCM P07D9:00 Gear 8 Incorrect Ratio: No Sub Type Information GO to Pinpoint Test R
PCM P07E4:00 Unable to Engage Park: No Sub Type Information GO to Pinpoint Test I
PCM P07E6:00 Stuck in Park: No Sub Type Information GO to Pinpoint Test I
PCM P0840:00 Transmission Fluid Pressure Sensor/Switch 'A' Circuit: No Sub Type Information GO to Pinpoint Test H
PCM P0841:00 Transmission Fluid Pressure Sensor/Switch 'A' Circuit Range/Performance: No Sub Type Information GO to Pinpoint Test H
PCM P0842:00 Transmission Fluid Pressure Sensor/Switch 'A' Circuit Low: No Sub Type Information GO to Pinpoint Test H
PCM P0843:00 Transmission Fluid Pressure Sensor/Switch 'A' Circuit High: No Sub Type Information GO to Pinpoint Test H
PCM P0845:00 Transmission Fluid Pressure Sensor/Switch 'B' Circuit: No Sub Type Information GO to Pinpoint Test H
PCM P0846:00 Transmission Fluid Pressure Sensor/Switch 'B' Circuit Range/Performance: No Sub Type Information GO to Pinpoint Test H
PCM P0847:00 Transmission Fluid Pressure Sensor/Switch 'B' Circuit Low: No Sub Type Information GO to Pinpoint Test H
PCM P0848:00 Transmission Fluid Pressure Sensor/Switch 'B' Circuit High: No Sub Type Information GO to Pinpoint Test H
PCM P0868:00 Transmission Fluid Pressure Low: No Sub Type Information GO to Pinpoint Test Z
PCM P0869:00 Transmission Fluid Pressure High: No Sub Type Information GO to Pinpoint Test Z
PCM P0882:00 TCM Power Input Signal Low: No Sub Type Information GO to Pinpoint Test J
PCM P0883:00 TCM Power Input Signal High: No Sub Type Information GO to Pinpoint Test J
PCM P093A:00 Hydraulic Accumulator Solenoid Circuit/Open: No Sub Type Information GO to Pinpoint Test E
PCM P093B:00 Hydraulic Accumulator Solenoid Circuit Low: No Sub Type Information GO to Pinpoint Test E
PCM P093C:00 Hydraulic Accumulator Solenoid Circuit High: No Sub Type Information GO to Pinpoint Test E
PCM P093D:00 Hydraulic Accumulator Solenoid Performance: No Sub Type Information GO to Pinpoint Test E
PCM P0960:00 Pressure Control Solenoid 'A' Control Circuit/Open: No Sub Type Information GO to Pinpoint Test F
PCM P0961:00 Pressure Control Solenoid 'A' Control Circuit Range/Performance: No Sub Type Information GO to Pinpoint Test F
PCM P0962:00 Pressure Control Solenoid 'A' Control Circuit Low: No Sub Type Information GO to Pinpoint Test F
PCM P0963:00 Pressure Control Solenoid 'A' Control Circuit High: No Sub Type Information GO to Pinpoint Test F
PCM P0973:00 Shift Solenoid 'A' Control Circuit Low: No Sub Type Information GO to Pinpoint Test A
PCM P0974:00 Shift Solenoid 'A' Control Circuit High: No Sub Type Information GO to Pinpoint Test A
PCM P0976:00 Shift Solenoid 'B' Control Circuit Low: No Sub Type Information GO to Pinpoint Test A
PCM P0977:00 Shift Solenoid 'B' Control Circuit High: No Sub Type Information GO to Pinpoint Test A
PCM P0979:00 Shift Solenoid 'C' Control Circuit Low: No Sub Type Information GO to Pinpoint Test A
PCM P097A:00 Shift Solenoid 'A' Control Circuit/Open: No Sub Type Information GO to Pinpoint Test A
PCM P097B:00 Shift Solenoid 'B' Control Circuit/Open: No Sub Type Information GO to Pinpoint Test A
PCM P097C:00 Shift Solenoid 'C' Control Circuit/Open: No Sub Type Information GO to Pinpoint Test A
PCM P097D:00 Shift Solenoid 'D' Control Circuit/Open: No Sub Type Information GO to Pinpoint Test A
PCM P097E:00 Shift Solenoid 'E' Control Circuit/Open: No Sub Type Information GO to Pinpoint Test A
PCM P097F:00 Shift Solenoid 'F' Control Circuit/Open: No Sub Type Information GO to Pinpoint Test A
PCM P0980:00 Shift Solenoid 'C' Control Circuit High: No Sub Type Information GO to Pinpoint Test A
PCM P0982:00 Shift Solenoid 'D' Control Circuit Low: No Sub Type Information GO to Pinpoint Test A
PCM P0983:00 Shift Solenoid 'D' Control Circuit High: No Sub Type Information GO to Pinpoint Test A
PCM P0985:00 Shift Solenoid 'E' Control Circuit Low: No Sub Type Information GO to Pinpoint Test A
PCM P0986:00 Shift Solenoid 'E' Control Circuit High: No Sub Type Information GO to Pinpoint Test A
PCM P0998:00 Shift Solenoid 'F' Control Circuit Low: No Sub Type Information GO to Pinpoint Test A
PCM P0999:00 Shift Solenoid 'F' Control Circuit High: No Sub Type Information GO to Pinpoint Test A
PCM P1001:00 KOER Not Able to Complete, KOER Aborted: No Sub Type Information GO to Pinpoint Test AA
PCM P1397:00 System Voltage Out Of Self Test Range: No Sub Type Information GO to Pinpoint Test J
PCM P1636:00 Inductive Signature Chip Communication Error: No Sub Type Information GO to Pinpoint Test AB
PCM P163E:00 Transmission Control Module Programming Error: No Sub Type Information GO to Pinpoint Test AC
PCM P163F:00 Transmission ID Block Corrupted, Not Programmed: No Sub Type Information GO to Pinpoint Test AC
PCM P1711:00 Transmission Fluid Temperature Sensor Out Of Self Test Range: No Sub Type Information GO to Pinpoint Test B
PCM P1744:00 Torque Converter Clutch Solenoid Circuit Performance: No Sub Type Information GO to Pinpoint Test AD
PCM P1783:00 Transmission Overtemperature Condition: No Sub Type Information GO to Pinpoint Test AE
PCM P1A02:00 Transmission One Way Clutch Performance: No Sub Type Information GO to Pinpoint Test AF
PCM P2669:00 Actuator Supply Voltage 'B' Circuit/Open: No Sub Type Information GO to Pinpoint Test A
PCM P26C3:00 Internal Control Module Transmission Range Sensor Performance: No Sub Type Information GO to Pinpoint Test AG
PCM P2700:00 Transmission Friction Element 'A' Apply Time Range/Performance: No Sub Type Information GO to Pinpoint Test AH
PCM P2701:00 Transmission Friction Element 'B' Apply Time Range/Performance: No Sub Type Information GO to Pinpoint Test AH
PCM P2702:00 Transmission Friction Element 'C' Apply Time Range/Performance: No Sub Type Information GO to Pinpoint Test AH
PCM P2703:00 Transmission Friction Element 'D' Apply Time Range/Performance: No Sub Type Information GO to Pinpoint Test AH
PCM P2704:00 Transmission Friction Element 'E' Apply Time Range/Performance: No Sub Type Information GO to Pinpoint Test AH
PCM P2705:00 Transmission Friction Element 'F' Apply Time Range/Performance: No Sub Type Information GO to Pinpoint Test AH
PCM P2707:00 Shift Solenoid 'F' Performance/Stuck Off: No Sub Type Information GO to Pinpoint Test X
PCM P2708:00 Shift Solenoid 'F' Stuck On: No Sub Type Information GO to Pinpoint Test Y
PCM P2709:00 Shift Solenoid 'F' Electrical: No Sub Type Information GO to Pinpoint Test A
PCM P2710:00 Shift Solenoid 'F' Intermittent: No Sub Type Information GO to Pinpoint Test A
PCM P2758:00 Torque Converter Clutch Pressure Control Solenoid Stuck On: No Sub Type Information GO to Pinpoint Test Y
PCM P2760:00 Torque Converter Clutch Pressure Control Solenoid Intermittent: No Sub Type Information GO to Pinpoint Test F
PCM P2769:00 Torque Converter Clutch Circuit Low: No Sub Type Information GO to Pinpoint Test F
PCM P2770:00 Torque Converter Clutch Circuit High: No Sub Type Information GO to Pinpoint Test F
PCM P2783:00 Torque Converter Temperature Too High: No Sub Type Information GO to Pinpoint Test AI
PCM P27B2:00 Internal Control Module Transmission Range Control Performance: No Sub Type Information GO to Pinpoint Test AJ
PCM P27B3:00 Internal Control Module Transmission Gear Select Performance: No Sub Type Information GO to Pinpoint Test AJ
PCM P27B4:00 Internal Control Module Transmission Gear Direction Control Performance: No Sub Type Information GO to Pinpoint Test AJ
PCM P27B5:00 Internal Control Module Transmission Gear Ratio Control Performance: No Sub Type Information GO to Pinpoint Test AJ
PCM P27B6:00 Internal Control Module Transmission Speed Sensor Performance: No Sub Type Information GO to Pinpoint Test AJ
PCM P2801:00 Transmission Range Sensor 'B' Circuit Range/Performance: No Sub Type Information GO to Pinpoint Test C
PCM P2802:00 Transmission Range Sensor 'B' Circuit Low: No Sub Type Information GO to Pinpoint Test C
PCM P2803:00 Transmission Range Sensor 'B' Circuit High: No Sub Type Information GO to Pinpoint Test C
PCM P2804:00 Transmission Range Sensor 'B' Circuit Intermittent: No Sub Type Information GO to Pinpoint Test C
PCM P2805:00 Transmission Range Sensor 'A'/ 'B' Correlation: No Sub Type Information GO to Pinpoint Test C
PCM P2888:00 Park Lock/Pawl Actuator Circuit/Open: No Sub Type Information GO to Pinpoint Test I
PCM P2889:00 Park Lock/Pawl Actuator Circuit Low: No Sub Type Information GO to Pinpoint Test I
PCM P288A:00 Park Lock/Pawl Actuator Circuit High: No Sub Type Information GO to Pinpoint Test I
PCM P288B:00 Park Lock/Pawl Actuator Circuit Performance: No Sub Type Information GO to Pinpoint Test I

Symptom Chart: Automatic Transmission

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

In most circumstances the PCM / TCM sets a DTC to help guide with diagnostics. Refer to the DTC Chart before using the Symptom Chart. The Condition column lists the vehicle condition. The Action column refers to a pinpoint test that lists possible sources of the condition and the action to be performed to determine the cause of each condition. Each pinpoint test lists the components that can cause the symptom and the individual components in that system. The components are listed in order of disassembly. Use the list of components and the required action to focus on disassembly inspections for the root cause of the concern.

Symptom Chart
Symptom Possible Sources Action
  • Engagement concerns
  • REFER to Pinpoint Test
  • GO to Pinpoint Test AK
  • Shift concerns
  • REFER to Pinpoint Test
  • GO to Pinpoint Test AL
  • Torque converter operation concerns
  • REFER to Pinpoint Test
  • GO to Pinpoint Test AM
  • Park engagement concerns
  • REFER to Pinpoint Test
  • GO to Pinpoint Test AN
  • Other concerns
  • REFER to Pinpoint Test
  • GO to Pinpoint Test AO

Pinpoint Tests


PINPOINT TEST A: TRANSMISSION CONTROL SOLENOIDS

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

The 8F35/8F40 transmission uses 6 linear force shift solenoids (A, B, C, D, E, F) called Casting Integrated Direct Acting Solenoids (CIDAS). Unlike previous shift solenoids, they are mechanical in nature meaning no transmission fluid passes through them. They use an armature pin assembly that moves a control valve in the main control valve body to control and apply hydraulic fluid pressure. Each clutch (A, B, C, D, E, F) has a corresponding shift solenoid (A, B, C, D, E, F) that is directly proportional in that zero current equals zero pressure and maximum current equals maximum pressure. Since there is no pressure with zero current, none of the clutch packs are able to engage if the power is interrupted to the shift solenoids .

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P0657:00 Actuator Supply Voltage 'A' Circuit/Open: No Sub Type Information The transmission solenoid power control 1 (TSPC1) provides power to shift solenoids B, D, E, and F as well as to the TCC and LPC solenoids. This DTC sets when the PCM has detected an open circuit.
PCM P0753:00 Shift Solenoid 'A' Electrical: No Sub Type Information DTC P0753 illuminates the wrench light in conjunction with P0973, P0974, and/or P097A. Service the more specific DTC first.
PCM P0754:00 Shift Solenoid 'A' Intermittent: No Sub Type Information The PCM detected a SSA fault, but the fault did not last long enough for the PCM to set a more specific SSA DTC . Inspect SSA wiring and connectors for damage.
PCM P0758:00 Shift Solenoid 'B' Electrical: No Sub Type Information DTC P0758 illuminates the wrench light in conjunction with P0976, P0977, and/or P097B. Service the more specific DTC first.
PCM P0759:00 Shift Solenoid 'B' Intermittent: No Sub Type Information The PCM detected a SSB fault, but the fault did not last long enough for the PCM to set a more specific SSB DTC . Inspect SSB wiring and connectors for damage.
PCM P0763:00 Shift Solenoid 'C' Electrical: No Sub Type Information DTC P0763 illuminates the wrench light in conjunction with P0779, P097C, and/or P0980. Service the more specific DTC first.
PCM P0764:00 Shift Solenoid 'C' Intermittent: No Sub Type Information The PCM detected SSC fault, but the fault did not last long enough for the PCM to set a more specific SSC DTC . Inspect SSC wiring and connectors for damage.
PCM P0768:00 Shift Solenoid 'D' Electrical: No Sub Type Information DTC P0768 illuminates the wrench light in conjunction with P097D, P0982, and/or P0982. Service the more specific DTC first.
PCM P0769:00 Shift Solenoid 'D' Intermittent: No Sub Type Information The PCM detected SSD fault, but the fault did not last long enough for the PCM to set a more specific SSD DTC . Inspect SSD wiring and connectors for damage.
PCM P0773:00 Shift Solenoid 'E' Electrical: No Sub Type Information DTC P0773 illuminates the wrench light in conjunction with P097E, P0985, and/or P0986. Service the more specific DTC first.
PCM P0774:00 Shift Solenoid 'E' Intermittent: No Sub Type Information The PCM detected SSE fault, but the fault did not last long enough for the PCM to set a more specific SSE DTC . Inspect SSE wiring and connectors for damage.
PCM P0973:00 Shift Solenoid 'A' Control Circuit Low: No Sub Type Information This DTC indicates a short to ground in the SSA electrical. A short to ground causes SSA to be failed to high current (maximum pressure since SSA is directly proportional), so A clutch is failed on.
PCM P0974:00 Shift Solenoid 'A' Control Circuit High: No Sub Type Information This DTC indicates a short to power in the SSA electrical. A short to power causes SSA to be failed to low current (minimum pressure since SSA is directly proportional), so A clutch is failed off.
PCM P0976:00 Shift Solenoid 'B' Control Circuit Low: No Sub Type Information This DTC indicates a short to ground in the SSB electrical. A short to ground causes SSB to be failed to high current (maximum pressure since SSB is directly proportional), so B clutch is failed on.
PCM P0977:00 Shift Solenoid 'B' Control Circuit High: No Sub Type Information This DTC indicates a short to power in the SSB electrical. A short to power causes SSB to be failed to low current (minimum pressure since SSB is directly proportional), so B clutch is failed off.
PCM P0979:00 Shift Solenoid 'C' Control Circuit Low: No Sub Type Information This DTC indicates a short to ground in the SSC electrical. A short to ground causes SSC to be failed to high current (maximum pressure since SSC is directly proportional), so C clutch is failed on.
PCM P097A:00 Shift Solenoid 'A' Control Circuit/Open: No Sub Type Information This DTC indicates an open circuit in the SSA electrical. Since an open causes SSA to be failed to low current (minimum pressure since SSA is directly proportional), A clutch is failed off.
PCM P097B:00 Shift Solenoid 'B' Control Circuit/Open: No Sub Type Information This DTC indicates an open circuit in the SSB electrical. Since an open causes SSB to be failed to low current (minimum pressure since SSB is directly proportional), B clutch is failed off.
PCM P097C:00 Shift Solenoid 'C' Control Circuit/Open: No Sub Type Information This DTC indicates an open circuit in the SSC electrical. Since an open causes SSC to be failed to low current (minimum pressure since SSC is directly proportional) C clutch is failed off.
PCM P097D:00 Shift Solenoid 'D' Control Circuit/Open: No Sub Type Information This DTC indicates an open circuit in the SSD electrical. Since an open causes SSD to be failed to low current (minimum pressure since SSD is directly proportional), D clutch is failed off.
PCM P097E:00 Shift Solenoid 'E' Control Circuit/Open: No Sub Type Information This DTC indicates an open circuit in the SSE electrical. Since an open causes SSE to be failed to low current (minimum pressure since SSE is directly proportional), E clutch is failed off.
PCM P097F:00 Shift Solenoid 'F' Control Circuit/Open: No Sub Type Information This DTC indicates an open circuit in the SSF electrical. Since an open causes SSF to be failed to low current (minimum pressure since SSF is directly proportional), F clutch is failed off.
PCM P0980:00 Shift Solenoid 'C' Control Circuit High: No Sub Type Information This DTC indicates a short to power in the SSC electrical. A short to power causes SSC to be failed to low current (minimum pressure since SSC is directly proportional), so C clutch is failed off.
PCM P0982:00 Shift Solenoid 'D' Control Circuit Low: No Sub Type Information This DTC indicates a short to ground in the SSD electrical. A short to ground causes SSD to be failed to high current (maximum pressure since SSD is directly proportional), so D clutch is failed on.
PCM P0983:00 Shift Solenoid 'D' Control Circuit High: No Sub Type Information This DTC indicates a short to power in the SSD electrical. A short to power causes SSD to be failed to low current (minimum pressure since SSD is directly proportional), so D clutch is failed off.
PCM P0985:00 Shift Solenoid 'E' Control Circuit Low: No Sub Type Information This DTC indicates a short to ground in the SSE electrical. A short to ground causes SSE to be failed to high current (maximum pressure since SSE is directly proportional), so E clutch is failed on.
PCM P0986:00 Shift Solenoid 'E' Control Circuit High: No Sub Type Information This DTC indicates a short to power in the SSE electrical. A short to power causes SSE to be failed to low current (minimum pressure since SSE is directly proportional), so E clutch is failed off.
PCM P0998:00 Shift Solenoid 'F' Control Circuit Low: No Sub Type Information This DTC indicates a short to ground in the SSF electrical. A short to ground causes SSF to be failed to high current (maximum pressure since SSE is directly proportional), so F clutch is failed on.
PCM P0999:00 Shift Solenoid 'F' Control Circuit High: No Sub Type Information This DTC indicates a short to power in the SSF electrical. A short to power causes SSF to be failed to low current (minimum pressure since SSF is directly proportional), so F clutch is failed off.
PCM P2669:00 Actuator Supply Voltage 'B' Circuit/Open: No Sub Type Information The transmission solenoid power control 2 (TSPC2) provides power to SSA and SSC . The PCM has detected an open circuit.
PCM P2709:00 Shift Solenoid 'F' Electrical: No Sub Type Information DTC P2709 illuminates the wrench light in conjunction with P097F, P0998, and/or P0999. Service the more specific DTC first.
PCM P2710:00 Shift Solenoid 'F' Intermittent: No Sub Type Information The PCM detected SSF fault, but the fault did not last long enough for the PCM to set a more specific SSF DTC . Inspect SSF wiring and connectors for damage.

Possible Sources

  • Connectors damaged or pushed-out terminals, corrosion, loose wires or ground and missing or damaged seals
  • Shift solenoid
  • PCM
A1 CHECK THE SOLENOID POWER CIRCUITS FOR VOLTAGE

NOTE: This pinpoint test is written to address all shift solenoid electrical faults. For each test step, only the circuits related to the DTC retrieved during the KOEO test need to be tested.

  • Ignition OFF.
  • Disconnect: Transmission Vehicle Harness C1520.
  • Ignition ON.
  • Measure:
    Click to display connectors

      TSPC1, TSPC2


    Positive Lead Measurement / Action Negative Lead
      C1520-14   Ground
      C1520-28   Ground

Is the voltage greater than 11 volts on the suspect circuit?
Yes GO to A4
No GO to A2

A2 CHECK THE SOLENOID POWER CIRCUITS FOR AN OPEN
  • Ignition OFF.
  • Disconnect: PCM C1551E
  • Inspect the connector for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1551E-92   C1520-14
      C1551E-91   C1520-28

Is the resistance less than 3 ohms on the suspect circuit?
Yes GO to A3
No REPAIR the transmission vehicle harness.

A3 CHECK THE SOLENOID POWER CIRCUITS FOR A SHORT TO GROUND

Click to display connectors
Positive Lead Measurement / Action Negative Lead
  C1551E-92   Ground
  C1551E-91   Ground

Is the resistance greater than 10,000 ohms on the suspect circuit?
Yes VERIFY all PCM power circuits and fuses. If no problem found,
   VIN required to access Guided Routine (PCM)
No REPAIR the circuit.

A4 CHECK SOLENOID CONTROL CIRCUITS FOR AN OPEN
  • Ignition OFF.
  • Disconnect: PCM C1551E
  • Inspect the connector for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
  • Measure the resistance of the solenoid control circuits using the following chart:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      SSA C1551E-73   C1520-24
      SSF C1551E-75   C1520-10
      SSC C1551E-74   C1520-27
      SSB C1551E-72   C1520-12
      SSE C1551E-67   C1520-26
      SSD C1551E-66   C1520-23

Is the resistance less than 3 ohms on the suspect circuit?
Yes GO to A5
No REPAIR the transmission vehicle harness circuit. CLEAR the DTC s.

A5 CHECK SOLENOID CONTROL CIRCUITS FOR A SHORT TO GROUND
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      SSA C1551E-73   Ground
      SSF C1551E-75   Ground
      SSC C1551E-74   Ground
      SSB C1551E-72   Ground
      SSE C1551E-67   Ground
      SSD C1551E-66   Ground

Is the resistance greater than 10,000 ohms on the suspect circuit?
Yes GO to A6
No REPAIR the transmission vehicle harness circuit. CLEAR the DTC s.

A6 CHECK SOLENOID CONTROL CIRCUITS FOR A SHORT TOGETHER WITH THE POWER CIRCUITS
  • Disconnect: PCM C1551B
  • Measure:
    Click to display connectors

      SSA


    Positive Lead Measurement / Action Negative Lead
      C1551E-73   C1551E-19
      C1551E-73   C1551E-80
      C1551E-73   C1551E-70
      C1551E-73   C1551E-91
      C1551E-73   C1551E-92
      C1551E-73   C1551E-29
      C1551E-73   C1551E-95
      C1551E-73   C1551E-71
      C1551E-73   C1551B-93
  • Measure:
    Click to display connectors

      SSB


    Positive Lead Measurement / Action Negative Lead
      C1551E-72   C1551E-19
      C1551E-72   C1551E-80
      C1551E-72   C1551E-70
      C1551E-72   C1551E-91
      C1551E-72   C1551E-92
      C1551E-72   C1551E-29
      C1551E-72   C1551E-95
      C1551E-72   C1551E-71
      C1551E-72   C1551B-93
  • Measure:
    Click to display connectors

      SSC


    Positive Lead Measurement / Action Negative Lead
      C1551E-74   C1551E-19
      C1551E-74   C1551E-80
      C1551E-74   C1551E-70
      C1551E-74   C1551E-91
      C1551E-74   C1551E-92
      C1551E-74   C1551E-29
      C1551E-74   C1551E-95
      C1551E-74   C1551E-71
      C1551E-74   C1551B-93
  • Measure:
    Click to display connectors

      SSD


    Positive Lead Measurement / Action Negative Lead
      C1551E-66   C1551E-19
      C1551E-66   C1551E-80
      C1551E-66   C1551E-70
      C1551E-66   C1551E-91
      C1551E-66   C1551E-92
      C1551E-66   C1551E-29
      C1551E-66   C1551E-95
      C1551E-66   C1551E-71
      C1551E-66   C1551B-93
  • Measure:
    Click to display connectors

      SSE


    Positive Lead Measurement / Action Negative Lead
      C1551E-67   C1551E-19
      C1551E-67   C1551E-80
      C1551E-67   C1551E-70
      C1551E-67   C1551E-91
      C1551E-67   C1551E-92
      C1551E-67   C1551E-29
      C1551E-67   C1551E-95
      C1551E-67   C1551E-71
      C1551E-67   C1551B-93
  • Measure:
    Click to display connectors

      SSF


    Positive Lead Measurement / Action Negative Lead
      C1551E-75   C1551E-19
      C1551E-75   C1551E-80
      C1551E-75   C1551E-70
      C1551E-75   C1551E-91
      C1551E-75   C1551E-92
      C1551E-75   C1551E-29
      C1551E-75   C1551E-95
      C1551E-75   C1551E-71
      C1551E-75   C1551B-93

Are the resistances greater than 10,000 ohms?
Yes GO to A7
No REPAIR the transmission vehicle harness circuit. CLEAR the DTC s.

A7 CHECK TRANSMISSION INTERNAL WIRING HARNESS SOLENOID TSPC1 AND TSPC2 POWER CIRCUITS FOR AN OPEN
  • Drain the transmission fluid and remove the main control cover.
    REFER to: Main Control Cover (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
  • Disconnect shift solenoids A through F.
  • Measure resistance of the suspect solenoid power circuit of the internal wiring harness, using the table below:
    Positive Lead Measurement / Action Negative Lead
    Transmission Harness Connector, component side, pin 28   SSA C1843-1
    Transmission Harness Connector, component side, pin 14   SSB C1844-1
    Transmission Harness Connector, component side, pin 28   SSC C1845-1
    Transmission Harness Connector, component side, pin 14   SSD C1846-1
    Transmission Harness Connector, component side, pin 14   SSE C1847-1
    Transmission Harness Connector, component side, pin 14   SSF C1848-1

Is the resistance less than 3 ohms on the suspect circuit?
Yes GO to A8
No INSTALL a new internal wiring harness.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

A8 CHECK TRANSMISSION INTERNAL WIRING HARNESS SOLENOID POWER CIRCUITS TSPC1 AND TSPC2 FOR A SHORT TO GROUND
  • Inspect the internal wiring harness for chafes or bare wires.
  • Measure:
    Positive Lead Measurement / Action Negative Lead
    Transmission Harness Connector, component side, pin 14   Ground
    Transmission Harness Connector, component side, pin 28   Ground

Are the resistances greater than 10,000 ohms?
Yes GO to A9
No INSTALL a new internal wiring harness.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

A9 CHECK TRANSMISSION INTERNAL WIRING HARNESS SOLENOID CONTROL CIRCUITS FOR AN OPEN
  • Measure resistance of the suspect solenoid control circuit of the internal wiring harness, using the table below:
    Positive Lead Measurement / Action Negative Lead
    Transmission Harness Connector, component side, pin 24   SSA C1843-2
    Transmission Harness Connector, component side, pin 12   SSB C1844-2
    Transmission Harness Connector, component side, pin 27   SSC C1845-2
    Transmission Harness Connector, component side, pin 23   SSD C1846-2
    Transmission Harness Connector, component side, pin 26   SSE C1847-2
    Transmission Harness Connector, component side, pin 10   SSF C1848-2

Is the resistance less than 3 ohms on the suspect circuit?
Yes GO to A10
No INSTALL a new internal wiring harness.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

A10 CHECK TRANSMISSION INTERNAL WIRING HARNESS SOLENOID CONTROL CIRCUITS FOR A SHORT TO GROUND
  • Inspect the internal wiring harness for chafes or bare wires.
  • Measure:
    Positive Lead Measurement / Action Negative Lead
      SSA C1843-2   Ground
      SSB C1844-2   Ground
      SSC C1845-2   Ground
      SSD C1846-2   Ground
      SSE C1847-2   Ground
      SSF C1848-2   Ground

Is the resistance greater than 10,000 ohms on the suspect circuit?
Yes GO to A11
No INSTALL a new internal wiring harness.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

A11 CHECK SOLENOID RESISTANCE
  • Disconnect the suspect solenoid connector and remove the suspect shift solenoid.
    REFER to: Solenoid (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
  • Measure and record the resistance of the suspected solenoid.

Is the shift solenoid resistance between 4.8 and 5.4 ohms?
Yes The issue could not be duplicated at this time. INSPECT all wiring harness connectors for fitment issues or intermittent connections.
No INSTALL a new solenoid for the solenoid that failed the resistance check.
REFER to: Solenoid (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).

PINPOINT TEST B: TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

The TFT sensor is a temperature dependent resistor that is in contact with transmission fluid in the transmission sump area. The PCM monitors the voltage across the TFT sensor, which changes as transmission fluid temperature varies. The PCM uses the TFT sensor signal as an input for its shifting strategy and TCC operation. The PCM also uses the TFT sensor signal for transmission fault detection and diagnostics.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P0710:00 Transmission Fluid Temperature Sensor 'A' Circuit: No Sub Type Information This DTC sets if the fault was not present long enough for the TCM to determine a more specific fault. If a more specific DTC such as P0712 or P0713 are set, resolve them first.
PCM P0711:00 Transmission Fluid Temperature Sensor 'A' Circuit Range/Performance: No Sub Type Information This DTC sets if the TCM detects no change (failed to change by at least 8 degrees F) in the TFT sensor when the vehicle was driven enough that the transmission fluid temperature should have changed.
PCM P0712:00 Transmission Fluid Temperature Sensor 'A' Circuit Low: No Sub Type Information This DTC sets if the TCM detects a short to ground in the TFT sensor circuitry.
PCM P0713:00 Transmission Fluid Temperature Sensor 'A' Circuit High: No Sub Type Information This DTC sets if the TCM detects an open in the TFT sensor circuitry.
PCM P1711:00 Transmission Fluid Temperature Sensor Out Of Self Test Range: No Sub Type Information This DTC sets if the PCM detects the TFT sensor voltage was in range but the indicated value was outside the expected range for self test.

Possible Sources

  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • TFT sensor
  • Transmission internal wiring harness
  • PCM
B1 CHECK THE TFT SENSOR SIGNAL INPUT CIRCUIT FOR VOLTAGE
  • Ignition OFF.
  • Disconnect: Transmission Vehicle Harness C1520.
  • Inspect the connector for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-2   Ground

Is the voltage between 4.8 and 5.1 volts?
Yes GO to B4
No GO to B2

B2 CHECK THE TFT SENSOR SIGNAL INPUT CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect: PCM C1551B.
  • Connect:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-2   C1551B-93

Is the resistance less than 3 ohms?
Yes GO to B3
No REPAIR the open circuit.

B3 CHECK THE TFT SENSOR SIGNAL INPUT CIRCUIT FOR A SHORT TO GROUND
  • Connect:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-2   Ground

Is the resistance greater than 10,000 ohms?
Yes VERIFY all PCM power circuits and fuses. If no problem found,
   VIN required to access Guided Routine (PCM)
No REPAIR the circuit.

B4 CHECK THE TFT SENSOR SIGNAL RETURN CIRCUIT FOR AN OPEN

NOTE: TFT and the A clutch, B clutch sensor share a common signal return circuit. Concurrent circuit faults for both sensors are most likely due to a fault in the signal return circuit.

  • Ignition OFF.
  • Disconnect: PCM C1551E.
  • Connect:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-21   C1551E-57

Is the resistance less than 3 ohms?
Yes GO to B5
No REPAIR the open circuit.

B5 CHECK THE TFT SENSOR SIGNAL RETURN CIRCUIT FOR A SHORT TO GROUND
  • Connect:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-21   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to B6
No REPAIR the circuit.

B6 CHECK THE TFT SENSOR SIGNAL RETURN CIRCUIT FOR A SHORT TOGETHER WITH THE POWER CIRCUITS
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1551E-57   C1551E-19
      C1551E-57   C1551E-80
      C1551E-57   C1551E-70
      C1551E-57   C1551E-91
      C1551E-57   C1551E-92
      C1551E-57   C1551E-29
      C1551E-57   C1551E-95
      C1551E-57   C1551E-71
      C1551E-57   C1551B-93

Are the resistances greater than 10,000 ohms?
Yes GO to B7
No REPAIR the circuit.

B7 CHECK THE INTERNAL WIRING HARNESS FOR AN OPEN
  • Ignition OFF.
  • Drain the transmission fluid and remove the main control cover.
    REFER to: Main Control Cover (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
  • Disconnect TFT Sensor C1842 .
  • Measure:
    Positive Lead Measurement / Action Negative Lead
    Transmission harness connector, component side, pin 2   C1842-1
    Transmission harness connector, component side, pin 21   C1842-2

Are the resistances less than 3 ohms?
Yes GO to B8
No INSTALL a new internal wiring harness.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

B8 CHECK THE INTERNAL WIRING HARNESS FOR A SHORT TO GROUND
  • Measure:
    Positive Lead Measurement / Action Negative Lead
    Transmission harness connector, component side, pin 2   Ground
    Transmission harness connector, component side, pin 21   Ground

Are the resistances greater than 10,000 ohms?
Yes GO to B9
No INSTALL a new internal wiring harness.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

B9 CHECK TFT SENSOR RESISTANCE
  • Measure and record the resistance of the TFT sensor.
  • Compare the measured resistance to the current temperature of the TFT sensor using the following chart.
    °C °F Resistance (ohms)
    -50 to -40 -58 to -40 41k-97k
    -39 to -20 -39 to -4 14k-52k
    -19 to -1 -3 to 31 5.5k-17k
    0 to 20 32 to 68 2.3k-6.4k
    21 to 40 69 to 104 1.1k-2.7k
    41 to 70 105 to 158 0.4k-1.3k
    71 to 90 159-194 236-445
    91 to 110 195-230 140-247
    111 to 130 231-266 87-145
    131 to 150 267-302 55-90

Does the resistance match the specification on the temperature chart?
Yes The TFT sensor is working correctly at this time. To diagnose an overheating concern,
REFER to: Transmission Cooling (307-02A Transmission Cooling - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
No INSTALL a new TFT sensor.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

PINPOINT TEST C: TRANSMISSION RANGE (TR) SENSOR

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

The TR sensor is comprised of a dual set of TR sensors. The park lock solenoid engages and disengages park and the park rod position is detected by reading TR sensors A and B. There is no manual valve, the PCM provides forward or reverse based on the dual TR sensor inputs. The 8F35/8F40 transmission uses dual PWM output (at 125 Hz) TR sensors where TR sensor A increases as the park rod is moved from park and TR sensor B decreases as the park rod is moved from park. Together the sum of the two signals should total 100%.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P0706:00 Transmission Range Sensor 'A' Circuit Range/Performance: No Sub Type Information The duty cycle for TR sensor A was within 8-92%, but the frequency was not 100-150 Hz for more than 3 seconds. This DTC sets and the MIL illuminates when the fault is detected during 2 consecutive key cycles.
PCM P0707:00 Transmission Range Sensor 'A' Circuit Low: No Sub Type Information The duty cycle for TR sensor A was less than 8% for more than 2 seconds. This DTC sets and the MIL illuminates when the fault is detected during 2 consecutive key cycles.
PCM P0708:00 Transmission Range Sensor 'A' Circuit High: No Sub Type Information The duty cycle for TR sensor A was more than 92% for more than 2 seconds. This DTC sets and the MIL illuminates when the fault is detected during 2 consecutive key cycles.
PCM P0709:00 Transmission Range Sensor 'A' Circuit Intermittent: No Sub Type Information The duty cycle for TR sensor A was not within 8-92% for more than 3 seconds. This DTC sets and the wrench lamp illuminates for the key cycle in which the fault occurred. Service the more specific DTC first.
PCM P2801:00 Transmission Range Sensor 'B' Circuit Range/Performance: No Sub Type Information The duty cycle for TR sensor B was within 8-92%, but the frequency was not 100-150 Hz for more than 3 seconds. This DTC sets and the MIL illuminates when the fault is detected during 2 consecutive key cycles.
PCM P2802:00 Transmission Range Sensor 'B' Circuit Low: No Sub Type Information The duty cycle for TR sensor B was less than 8% for more than 2 seconds. This DTC sets and the MIL illuminates when the fault is detected during 2 consecutive key cycles.
PCM P2803:00 Transmission Range Sensor 'B' Circuit High: No Sub Type Information The duty cycle for TR sensor B was more than 92% for more than 2 seconds. This DTC sets and the MIL illuminates when the fault is detected during 2 consecutive key cycles.
PCM P2804:00 Transmission Range Sensor 'B' Circuit Intermittent: No Sub Type Information The duty cycle for TR sensor B was not within 8-92% for more than 3 seconds. This DTC sets and the wrench lamp illuminates for the key cycle in which the fault occurred. Service the more specific DTC first.
PCM P2805:00 Transmission Range Sensor 'A'/ 'B' Correlation: No Sub Type Information The duty cycles for TR sensors A and B did not total 100% for more than 3 seconds. This DTC sets and the MIL illuminates when the fault is detected during 2 consecutive key cycles.

Possible Sources

  • Connectors damaged or pushed-out terminals, corrosion, loose wires or ground and missing or damaged seals
  • TR sensor
  • PCM
C1 CHECK TRP1 AND TRP2 CIRCUITS FOR POWER
  • Ignition OFF.
  • Disconnect: Transmission Vehicle Harness C1520.
  • Inspect the connector for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-4   Ground
      C1520-5   Ground

Are the voltages approximately 5 volts?
Yes GO to C2
No GO to C3

C2 CHECK TR SENSOR VREF CIRCUIT FOR POWER
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-17   Ground

Is the voltage approximately 8.2 to 9 volts?
Yes GO to C5
No GO to C3

C3 CHECK TR SENSOR VREF AND VOLTAGE CIRCUITS FOR AN OPEN
  • Ignition OFF.
  • Disconnect: PCM C1551E.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-4   C1551E-29
      C1520-5   C1551E-80
      C1520-17   C1551E-70

Are the resistances less than 3 ohms?
Yes GO to C4
No REPAIR the circuit.

C4 CHECK TR SENSOR VREF AND VOLTAGE CIRCUITS FOR A SHORT TO GROUND
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-4   Ground
      C1520-5   Ground
      C1520-17   Ground

Are the resistances greater than 10,000 ohms?
Yes VERIFY all PCM power circuits and fuses. If no problem found,
   VIN required to access Guided Routine (PCM)
No REPAIR the circuit.

C5 CHECK TR SENSOR GROUND CIRCUIT FOR AN OPEN
  • Disconnect: PCM C1551E.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-7   C1551E-62

Is the resistance less than 3 ohms?
Yes GO to C7
No REPAIR the circuit.

C6 CHECK TR SENSOR GROUND CIRCUIT FOR A SHORT TOGETHER WITH THE POWER CIRCUITS
  • Disconnect: PCM C1551B
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1551E-62   C1551E-19
      C1551E-62   C1551E-80
      C1551E-62   C1551E-70
      C1551E-62   C1551E-91
      C1551E-62   C1551E-92
      C1551E-62   C1551E-29
      C1551E-62   C1551E-95
      C1551E-62   C1551E-71
      C1551E-62   C1551B-93

Are the resistances greater than 10,000 ohms?
Yes GO to C7
No REPAIR the transmission vehicle harness circuit. CLEAR the DTC s.

C7 CHECK TR SENSOR TRP1, TRP2, CIRCUITS FOR POWER
  • Remove the main control cover.
    REFER to: Main Control Cover (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
  • Connect Transmission Vehicle Harness C1520 .
  • Connect PCM C1551E .
  • Connect PCM C1551B .
  • Disconnect TR sensor C167 .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C167-2   Ground
      C167-3   Ground

Are the voltages approximately 5 volts?
Yes GO to C8
No INSTALL a new transmission internal wiring harness.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

C8 CHECK TR SENSOR VREF CIRCUIT FOR POWER
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C167-4   Ground

Is the voltage approximately 8.2 to 9 volts?
Yes GO to C9
No INSTALL a new transmission internal wiring harness.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

C9 CHECK INTERNAL WIRING HARNESS FOR AN OPEN GROUND CIRCUIT
  • Ignition OFF.
  • Disconnect Transmission Vehicle Harness C1520 .
  • Measure:
    Positive Lead Measurement / Action Negative Lead
    Transmission Harness Connector, component side, pin 7   C167-1

Is the resistance less than 3 ohms?
Yes INSTALL a new TR sensor.
REFER to: Transmission Range (TR) Sensor (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
No INSTALL a new transmission internal wiring harness.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

PINPOINT TEST D: OUTPUT SHAFT SPEED (OSS) SENSOR, TURBINE SHAFT SPEED (TSS) SENSOR AND INTERMEDIATE SHAFT SPEED A (ISSA) SENSOR

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

The OSS sensor is a Hall-effect type sensor that provides a signal to the PCM that changes in frequency as the rotating speed of the output shaft varies. The TSS and Intermediate Shaft Speed A (ISSA) sensors are contained in one Hall-effect type sensor that provides a signal to the PCM . The TSS sensor monitors the speed of the input B clutch cylinder and the ISSA sensor monitors the speed of the reaction sun gear. The PCM compares the OSS sensor signal with the TSS sensor signal to determine the gear ratio provided by the rear planetary gearset. The PCM also uses the OSS sensor signal as an input for its shift strategies and TCC operation.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P0715:00 Input/Turbine Shaft Speed Sensor 'A' Circuit: No Sub Type Information The PCM detected either an open or a short to ground in the TSS sensor circuitry.
PCM P0717:00 Input/Turbine Shaft Speed Sensor 'A' Circuit No Signal: No Sub Type Information This DTC sets with DTC s P0715, P07BF, P07C0 and is used to illuminate the wrench light. Resolve the more specific DTC s first.
PCM P0718:00 Input/Turbine Shaft Speed Sensor 'A' Circuit Intermittent: No Sub Type Information The PCM detected a TSS sensor fault, but the fault did not last long enough for the PCM to set a more specific TSS sensor DTC . Inspect TSS sensor wiring and connectors for damage.
PCM P07C0:00 Input/Turbine Shaft Speed Sensor 'A' Circuit High: No Sub Type Information The PCM detected a short to power in the TSS sensor circuitry.
PCM P0791:00 Intermediate Shaft Speed Sensor 'A' Circuit: No Sub Type Information The PCM detected an open or a short to ground in the ISSA sensor circuitry.
PCM P07C6:00 Intermediate Shaft Speed Sensor 'A' Circuit High: No Sub Type Information The PCM detected a short to power in the ISSA sensor circuitry.
PCM P0793:00 Intermediate Shaft Speed Sensor 'A' Circuit No Signal: No Sub Type Information This DTC sets with DTC s P0791, P07C5, P07C6 and is used to illuminate the wrench light. Resolve the more specific DTC s first.
PCM P0794:00 Intermediate Shaft Speed Sensor 'A' Circuit Intermittent: No Sub Type Information The PCM detected an ISSA sensor fault, but the fault did not last long enough for the PCM to set a more specific ISSA sensor DTC . Inspect ISSA sensor wiring and connectors for damage.
PCM P0720:00 Output Shaft Speed Sensor Circuit: No Sub Type Information The PCM detected an open or a short to ground in the OSS sensor circuitry.
PCM P0722:00 Output Shaft Speed Sensor Circuit No Signal: No Sub Type Information This DTC sets with DTC s P0720, P077C or P077D and is used to illuminate the wrench light. Re the more specific DTC s first.
PCM P077D:00 Output Shaft Speed Sensor Circuit High: No Sub Type Information The PCM detected a short to power in the OSS sensor circuitry.
PCM P0723:00 Output Shaft Speed Sensor Circuit Intermittent: No Sub Type Information The PCM detected a OSS sensor fault, but the fault did not last long enough for the PCM to set a more specific OSS sensor DTC . Inspect OSS sensor wiring and connectors for damage.

Possible Sources

  • Connectors damaged or pushed-out terminals, corrosion, loose wires or ground and missing or damaged seals
  • TSS /ISSA sensor
  • OSS sensor
D1 CHECK POWER CIRCUITS FOR VOLTAGE
  • Ignition OFF.
  • Disconnect: Transmission Vehicle Harness C1520.
  • Inspect the connector for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
  • Disconnect TSS/ISSA sensor C143. .
  • Ignition ON.
  • For OSS sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-17   Ground
  • For TSS/ISSA sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C143-2   Ground

Is the voltage on the suspect circuit 8.0 to 9.5 volts?
Yes GO to D5
No GO to D2

D2 CHECK THE SENSOR POWER CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Disconnect: PCM C1551E.
  • For OSS sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-17   Ground
  • For TSS/ISSA sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C143-2   Ground

Is the resistance on the suspect circuit greater than 10,000 ohms?
Yes GO to D3
No INSPECT and REPAIR transmission vehicle harness sensor power circuit for a short to ground.

D3 CHECK THE SENSOR POWER CIRCUIT FOR AN OPEN
  • For OSS sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-17   C1551E-70
  • For TSS/ISSA sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C143-2   C1551E-71

Is the resistance on the suspect circuit less than 3 ohms?
Yes VERIFY all PCM power circuits and fuses. If no problem found,
   VIN required to access Guided Routine (PCM)
No REPAIR the circuit.

D4 CHECK THE SENSOR SIGNAL CIRCUIT FOR A SHORT TOGETHER WITH THE POWER CIRCUITS
  • Ignition OFF.
  • Disconnect: PCM C1551E (if not already disconnected).
  • Disconnect: PCM C1551B.
  • Inspect the connectors for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
  • For OSS sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1551E-68   C1551E-19
      C1551E-68   C1551E-80
      C1551E-68   C1551E-70
      C1551E-68   C1551E-91
      C1551E-68   C1551E-92
      C1551E-68   C1551E-29
      C1551E-68   C1551E-95
      C1551E-68   C1551E-71
      C1551E-68   C1551B-93
  • For TSS/ISSA sensor, measure:
    Click to display connectors

      ISSA Sensor


    Positive Lead Measurement / Action Negative Lead
      C1551E-61   C1551E-19
      C1551E-61   C1551E-80
      C1551E-61   C1551E-70
      C1551E-61   C1551E-91
      C1551E-61   C1551E-92
      C1551E-61   C1551E-29
      C1551E-61   C1551E-95
      C1551E-61   C1551E-71
      C1551E-61   C1551B-93

    Click to display connectors

      TSS Sensor


    Positive Lead Measurement / Action Negative Lead
      C1551E-90   C1551E-19
      C1551E-90   C1551E-80
      C1551E-90   C1551E-70
      C1551E-90   C1551E-91
      C1551E-90   C1551E-92
      C1551E-90   C1551E-29
      C1551E-90   C1551E-95
      C1551E-90   C1551E-71
      C1551E-90   C1551B-93

Are the resistances on the suspect circuit greater than 10,000 ohms?
Yes GO to D5
No REPAIR the circuit or INSTALL a new harness as necessary.

D5 CHECK THE SENSOR RETURN CIRCUIT FOR AN OPEN
  • For OSS sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-3   C1551E-68
  • For TSS/ISSA sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C143-1   C1551E-61
      C143-3   C1551E-90

Is the resistance less than 3 ohms on the suspect circuit?
Yes GO to D6
No REPAIR the circuit for an open.

D6 CHECK THE SENSOR RETURN CIRCUIT FOR A SHORT TO GROUND
  • For OSS sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-3   Ground
  • For TSS/ISSA sensor, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C143-1   Ground
      C143-3   Ground

Is the resistance on the suspect circuit greater than 10,000 ohms?
Yes For theTSS/ISSA sensor, INSTALL a new sensor.
REFER to: Turbine Shaft Speed (TSS) Sensor and Intermediate Speed Sensor A (ISSA) (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
For the OSS sensor, GO to D7
No REPAIR the circuit.

D7 CHECK THE INTERNAL HARNESS SENSOR RETURN CIRCUIT FOR A SHORT TO POWER CIRCUITS
  • Remove the main control cover.
    REFER to: Main Control Cover (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
  • Disconnect OSS sensor C1107 .
  • Measure:
    Positive Lead Measurement / Action Negative Lead
    Transmission Harness Connector, component side, pin 3 Transmission Harness Connector, component side, pin 1
    Transmission Harness Connector, component side, pin 3 Transmission Harness Connector, component side, pin 2
    Transmission Harness Connector, component side, pin 3 Transmission Harness Connector, component side, pin 4
    Transmission Harness Connector, component side, pin 3 Transmission Harness Connector, component side, pin 5
    Transmission Harness Connector, component side, pin 3 Transmission Harness Connector, component side, pin 14
    Transmission Harness Connector, component side, pin 3 Transmission Harness Connector, component side, pin 15
    Transmission Harness Connector, component side, pin 3 Transmission Harness Connector, component side, pin 17
    Transmission Harness Connector, component side, pin 3 Transmission Harness Connector, component side, pin 28

Are the resistances greater than 10,000 ohms?
Yes GO to D8
No INSTALL a new transmission internal wiring harness.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

D8 CHECK THE INTERNAL HARNESS FOR AN OPEN
  • Measure:
    Positive Lead Measurement / Action Negative Lead
      C1107-1 Transmission Harness Connector, component side, pin 17
      C1107-2 Transmission Harness Connector, component side, pin 3

Are the resistances less than 3 ohms?
Yes GO to D9
No INSTALL a new transmission internal wiring harness.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

D9 CHECK THE INTERNAL HARNESS FOR A SHORT TO GROUND
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1107-1   Ground
      C1107-2   Ground

Are the resistances greater than 10,000 ohms?
Yes INSTALL a new OSS sensor.
REFER to: Output Shaft Speed (OSS) Sensor (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
No INSTALL a new transmission internal wiring harness.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

PINPOINT TEST E: AUTO START-STOP ACCUMULATOR SOLENOID

Refer to Wiring Diagrams Cell 30 for schematic and connector information.

Normal Operation and Fault Conditions

For the start/stop system the 8F35/40 transmission comes equipped with an electronically controlled start-stop hydraulic accumulator that stores fluid pressure while the engine is running. During an auto start-stop event when the engine is off, the hydraulic accumulator holds on to the fluid and only releases the pressure into the transmission line pressure hydraulic circuit when the engine starts to crank or the customer releases the brake allowing the transmission to stay engaged while the main pump is not creating fluid pressure. This allows quick response time as the transmission reengages while the engine re-starts. The transmission auto start-stop accumulator is controlled by an on/off solenoid which, during a start stop event, is activated when the brake pedal is released and the engine RPM reaches 200 RPM, hydraulic pressure stored in the accumulator is released into the transmission line pressure passage. The solenoid is controlled by a smart driver chip. When the PCM commands the solenoid on, the smart driver returns fault information (open, short to power, short to ground). The auto start-stop accumulator solenoid operating voltage is between 9-18 volts.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P093A:00 Hydraulic Accumulator Solenoid Circuit/Open: No Sub Type Information The PCM detected an open in the auto start-stop accumulator solenoid wiring or solenoid.
PCM P093B:00 Hydraulic Accumulator Solenoid Circuit Low: No Sub Type Information The PCM detected a short to ground in the auto start-stop accumulator solenoid wiring or solenoid.
PCM P093C:00 Hydraulic Accumulator Solenoid Circuit High: No Sub Type Information The PCM detected a short to power in the auto start-stop accumulator solenoid wiring or solenoid.
PCM P093D:00 Hydraulic Accumulator Solenoid Performance: No Sub Type Information The PCM detected a non electrical failure in the auto start-stop accumulator. Check for possible fluid contamination, accumulator failure, or an anti-backflow check valve leaking pressure.

Possible Sources

  • Connectors damaged or pushed-out terminals, corrosion, loose wires or ground and missing or damaged seals
  • Auto start-stop accumulator and/or solenoid
  • PCM
E1 RETRIEVE AND RECORD ALL DTCS
  • Using the diagnostic scan tool, retrieve all DTC s.

Are DTC s P093A, P093B, P093C, P093D present?
Yes For DTC P093A, P093B, P093C, GO to E2
If no electrical DTC s are set, but DTC P093D is set, GO to E10
No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or terminal issues.

E2 CHECK THE AUTO START-STOP ACCUMULATOR SOLENOID POWER CIRCUIT FOR VOLTAGE
  • Ignition OFF.
  • Disconnect Transmission Vehicle Harness C1520 .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-15   Ground

Is the voltage greater than 11 volts?
Yes GO to E5
No GO to E3

E3 CHECK THE TRANSMISSION TASV CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect PCM C1551E .
  • Disconnect Auto Start-Stop Accumulator C148 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-15   C1551E-95

Is the resistance less than 3 ohms?
Yes GO to E4
No REPAIR the circuit.

E4 CHECK THE TRANSMISSION TASV CIRCUIT FOR A SHORT TO GROUND
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-15   Ground

Is the resistance greater than 10,000 ohms?
Yes
   VIN required to access Guided Routine (PCM)
No REPAIR the circuit.

E5 CHECK THE AUTO START-STOP ACCUMULATOR SOLENOID TASV CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect PCM C1551E .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1551E-95   C148-1

Is the resistance less than 3 ohms?
Yes GO to E6
No REPAIR the circuit.

E6 CHECK THE AUTO START-STOP ACCUMULATOR SOLENOID POWER CIRCUIT FOR A SHORT TO GROUND
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1551E-95   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to E7
No REPAIR the circuit.

E7 CHECK THE AUTO START-STOP ACCUMULATOR SOLENOID CONTROL CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect PCM C1551B .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1551B-60   C148-2

Is the resistance less than 3 ohms?
Yes GO to E8
No REPAIR the circuit.

E8 CHECK THE AUTO START-STOP ACCUMULATOR SOLENOID CONTROL CIRCUIT FOR A SHORT TO GROUND
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1551B-60   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to E9
No REPAIR the circuit.

E9 CHECK THE AUTO START-STOP ACCUMULATOR SOLENOID FOR AN OPEN
  • Ignition OFF.
  • Measure:
    Positive Lead Measurement / Action Negative Lead
    Auto start-stop accumulator solenoid, component side, pin 1 Auto start-stop accumulator solenoid, component side, pin 2

Is the resistance between 17 and 19 ohms?
Yes GO to E10
No INSTALL a new auto start-stop accumulator solenoid.
REFER to: Auto-Start-Stop Accumulator (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).

E10 VERIFY THAT TRANSMISSION LINE PRESSURE IS NORMAL
  • Verify that transmission line pressure is normal. Perform the line pressure test.
    REFER to: Special Testing Procedures (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).

Is the transmission line pressure within acceptable limits?
Yes GO to E11
No REPAIR as necessary.

E11 CHECK THE AUTO START STOP ACCUMULATOR HYDRAULIC PRESSURE RELEASE FUNCTION
  • Connect pressure vacuum tester or 0-689 kPa (0-100 psi) pressure gauge to the front line pressure tap on top of the transmission .
  • Connect the diagnostic tool.
  • Ignition ON.
  • Connect jumper:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    Battery positive   C1551E-95
  • Calibrate the pressure vacuum tester or pressure gauge to 0.
  • Monitor the line pressure while touching the negative jumper to ground.
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1551B-60   Ground

Does the line pressure increase to more than 620 kPa (90 psi)?
Yes REMOVE the jumper.
   VIN required to access Guided Routine (PCM)
No REMOVE the jumper. INSTALL a new auto start-stop accumulator.
REFER to: Auto-Start-Stop Accumulator (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).

PINPOINT TEST F: TORQUE CONVERTER CLUTCH (TCC), LINE PRESSURE CONTROL (LPC) SOLENOIDS

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

When the electrical connector or solenoid is disconnected, inspect the connector for terminal condition, corrosion and contamination and the connector seal for damage. Clean, repair or install new components as required. If the power circuit to the transmission solenoids fails open, then all solenoids are failed electrically off. Check for an open, short to ground or the transmission connector disconnected. The TCC is controlled by a directly proportional solenoid. Like the shift solenoids the TCC solenoid is controlled by a smart driver capable of detecting open, short to ground and short to power faults. In the event of an open circuit or short to power fault the TCC circuit is failed open. The TCC and LPC solenoids share a high side driver. Anytime power is removed from the transmission, the TCC solenoid defaults to MAX line pressure with open TCC . LPC is controlled by an inversely proportional solenoid (0 current = max pressure, max current = min line pressure). The LPC solenoid is controlled by a smart driver capable of detecting open, short to ground or short to power faults. Power is supplied to both solenoids by the transmission solenoid power control 1 (TSPC1).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P0657:00 Actuator Supply Voltage 'A' Circuit/Open: No Sub Type Information The transmission solenoid power control 1 (TSPC1) provides power to shift solenoids B, D, E, and F as well as to the TCC and LPC solenoids. The DTC sets when the PCM has detected an open circuit.
PCM P0740:00 Torque Converter Clutch Solenoid Circuit/Open: No Sub Type Information The PCM detected an open in the TCC solenoid or circuitry.
PCM P0743:00 Torque Converter Clutch Solenoid Circuit Electrical: No Sub Type Information This DTC sets with DTC s P0740, P2769, P2770 and is used to illuminate the wrench light. Resolve the more specific DTC s first.
PCM P0748:00 Pressure Control Solenoid 'A' Electrical: No Sub Type Information This DTC sets with DTC s P0960, P0962, P0963 and is used to illuminate the wrench light. Resolve the more specific DTC s first.
PCM P0960:00 Pressure Control Solenoid 'A' Control Circuit/Open: No Sub Type Information The PCM detected an open in the LPC solenoid or circuitry.
PCM P0961:00 Pressure Control Solenoid 'A' Control Circuit Range/Performance: No Sub Type Information The PCM detected a LPC solenoid fault, but the fault did not last long enough for the PCM to set a more specific LPC solenoid DTC . Inspect LPC solenoid wiring and connectors for damage.
PCM P0962:00 Pressure Control Solenoid 'A' Control Circuit Low: No Sub Type Information The PCM detected a short to ground in the LPC solenoid or circuitry.
PCM P0963:00 Pressure Control Solenoid 'A' Control Circuit High: No Sub Type Information The PCM detected a short to power in the LPC solenoid or circuitry.
PCM P2760:00 Torque Converter Clutch Pressure Control Solenoid Intermittent: No Sub Type Information The PCM detected a TCC solenoid fault, but the fault did not last long enough for the PCM to set a more specific TCC solenoid DTC . Inspect TCC solenoid wiring and connectors for damage.
PCM P2769:00 Torque Converter Clutch Circuit Low: No Sub Type Information The PCM detected a short to ground in the TCC solenoid or circuitry.
PCM P2770:00 Torque Converter Clutch Circuit High: No Sub Type Information The PCM detected a short to power in the TCC solenoid or circuitry.

Possible Sources

  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • TCC and LPC solenoid(s)
  • Transmission internal wiring harness
  • PCM
F1 CHECK THE SOLENOID POWER CIRCUIT TSPC1 FOR VOLTAGE
  • Ignition OFF.
  • Disconnect: Transmission Harness C1520.
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-14   Ground

Is the voltage greater than 11 volts?
Yes GO to F4
No GO to F2

F2 CHECK THE TSPC1 SOLENOID POWER CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect: PCM C1551E.
  • Inspect the connector for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1551E-92   C1520-14

Is the resistance less than 3 ohms?
Yes GO to F3
No REPAIR the transmission vehicle harness circuit.

F3 CHECK THE TSPC1 SOLENOID POWER CIRCUIT FOR SHORT TO GROUND
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1551E-92   Ground

Is the resistance greater than 10,000 ohms?
Yes
   VIN required to access Guided Routine (PCM)
No REPAIR the transmission vehicle harness circuit.

F4 CHECK VEHICLE HARNESS SOLENOID CONTROL CIRCUITS FOR AN OPEN
  • Ignition OFF.
  • Disconnect: PCM C1551E
  • Inspect the connector for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
  • For the TCC solenoid, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1551E-64   C1520-13
  • For the LPC solenoid, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1551E-65   C1520-11

Is the resistance less than 3 ohms on the suspect circuit?
Yes GO to F5
No REPAIR the transmission vehicle harness circuit. CLEAR the DTC s.

F5 CHECK VEHICLE HARNESS SOLENOID CONTROL CIRCUITS FOR A SHORT TO GROUND
  • For the TCC colenoid, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1551E-64   Ground
  • For the LPC solenoid, measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1551E-65   Ground

Is the resistance greater than 10,000 ohms on the suspect circuit?
Yes GO to F6
No REPAIR the transmission vehicle harness circuit. CLEAR the DTC s.

F6 CHECK SOLENOID CONTROL CIRCUITS FOR A SHORT TOGETHER WITH POWER CIRCUITS
  • Disconnect: PCM C1551B
  • Measure:
    Click to display connectors

      TCC Solenoid


    Positive Lead Measurement / Action Negative Lead
      C1551E-64   C1551E-19
      C1551E-64   C1551E-80
      C1551E-64   C1551E-70
      C1551E-64   C1551E-91
      C1551E-64   C1551E-92
      C1551E-64   C1551E-29
      C1551E-64   C1551E-95
      C1551E-64   C1551E-71
      C1551E-64   C1551B-93
  • Measure:
    Click to display connectors

      LPC Solenoid


    Positive Lead Measurement / Action Negative Lead
      C1551E-65   C1551E-19
      C1551E-65   C1551E-80
      C1551E-65   C1551E-70
      C1551E-65   C1551E-91
      C1551E-65   C1551E-92
      C1551E-65   C1551E-29
      C1551E-65   C1551E-95
      C1551E-65   C1551E-71
      C1551E-65   C1551B-93

Is the resistance greater than 10,000 ohms on the suspect circuit?
Yes GO to F7
No REPAIR the transmission vehicle harness circuit. CLEAR the DTC s.

F7 CHECK TRANSMISSION INTERNAL WIRING HARNESS FOR AN OPEN CIRCUIT
  • Remove the main control cover.
    REFER to: Main Control Cover (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
  • Disconnect TCC solenoid C1841 .
  • Measure:

      TCC Solenoid


    Positive Lead Measurement / Action Negative Lead
    Transmission Harness Connector, component side, pin 13   C1841-2
  • Disconnect LPC solenoid C1840 .
  • Measure:

      LPC Solenoid


    Positive Lead Measurement / Action Negative Lead
    Transmission Harness Connector, component side, pin 11   C1840-2
  • Measure:

      TSPC1 Circuits


    Positive Lead Measurement / Action Negative Lead
    Transmission Harness Connector, component side, pin 14   C1841-1
    Transmission Harness Connector, component side, pin 14   C1840-1

Are the resistances less than 3 ohms?
Yes GO to F8
No INSTALL a new internal wiring harness.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

F8 CHECK TRANSMISSION INTERNAL WIRING HARNESS FOR A SHORT TO GROUND
  • Measure:

      TCC Solenoid


    Positive Lead Measurement / Action Negative Lead
    Transmission Harness Connector, component side, pin 13   Ground
  • Measure:

      LPC Solenoid


    Positive Lead Measurement / Action Negative Lead
    Transmission Harness Connector, component side, pin 11   Ground
  • Measure:

      TSPC1 Circuits


    Positive Lead Measurement / Action Negative Lead
    Transmission Harness Connector, component side, pin 14   Ground

Are the resistances greater than 10,000 ohms?
Yes GO to F9
No INSTALL a new internal wiring harness.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

F9 CHECK SOLENOID RESISTANCE
  • Measure and record the resistance of the suspected solenoid.
    REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Description and Operation).
    Compare the recorded value with the chart below:
    Solenoid Ohms
    LPC solenoid 4.6 to 5.2
    TCC solenoid 4.6 to 5.2

Are the solenoid resistances within specification?
Yes All tests have passed, INSPECT the connector terminals for fitment or intermittent connections.
No INSTALL a new solenoid for the solenoid that failed the resistance check.
REFER to: Solenoid (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).

PINPOINT TEST G: OSS SENSOR, TSS AND ISSA SENSOR PERFORMANCE DTC FAULTS

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

The OSS sensor is a Hall-effect type sensor that provides a signal to the PCM that changes in frequency as the rotating speed of the output shaft varies. The TSS and Intermediate Shaft Speed A (ISSA) sensors are contained in one Hall-effect type sensor that provides a signal to the PCM . The TSS sensor monitors the speed of the input B clutch cylinder and the ISSA sensor monitors the speed of the reaction sun gear. The PCM compares the OSS sensor signal with the TSS sensor signal to determine the gear ratio provided by the rear planetary gearset. The PCM also uses the OSS sensor signal as an input for its shift strategies and TCC operation.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P0716:00 Input/Turbine Shaft Speed Sensor 'A' Circuit Range/Performance: No Sub Type Information This DTC sets if the PCM detects too large of a sensor air gap, a TSS sensor fault or an undetected clutch fault.
PCM P0721:00 Output Shaft Speed Sensor Circuit Range/Performance: No Sub Type Information This DTC sets if the PCM detects too large of a sensor air gap, a OSS sensor fault or an undetected clutch fault.
PCM P0792:00 Intermediate Shaft Speed Sensor 'A' Circuit Range/Performance: No Sub Type Information This DTC sets if the PCM detects too large of a sensor air gap, an ISSA sensor fault or an undetected clutch fault.

Possible Sources

  • Connectors damaged or pushed-out terminals, corrosion, loose wires or ground and missing or damaged seals
  • Loose sensor
  • Intermittent short to ground
G1 CHECK FOR DTCS
  • Using a diagnostic scan tool, perform the PCM self-test.
  • If any other speed sensor DTC s are present resolve them first.

Are DTCs P0716, P0721, P0792 present?
Yes For DTC P0716, P0792 GO to G2
For DTC P0721, GO to G3
No For all other DTC s, REFER to the DTC chart. Otherwise the fault may be intermittent.

G2 CHECK TSS/ISSA SENSOR
  • If any other TSS /ISSA sensor DTC s are present, resolve them first. If only DTC P0716 is present, inspect the TSS /ISSA Sensor electrical connectors for loose connections. Confirm the TSS /ISSA sensor is not loose. Inspect the TSS sensor tone wheel (part of No. 2 carrier) for damage. Inspect the ISSA tone wheel (part of reaction sun gear) for damage.

Were any issues found?
Yes REPAIR wiring connections or INSTALL new parts as necessary.
No INSTALL a new TSS sensor.
REFER to: Turbine Shaft Speed (TSS) Sensor and Intermediate Speed Sensor A (ISSA) (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).

G3 CHECK OSS SENSOR
  • If any other OSS sensor DTC s are present, resolve them first. If only DTC P0721 is present, inspect the OSS sensor electrical connectors for loose connections. Visually check the air gap and confirm the OSS sensor is not loose. Inspect the OSS sensor tone wheel (part of No. 4 carrier) for damage.

Were any issues found?
Yes REPAIR wiring connections or INSTALL new parts as necessary.
No INSTALL a new OSS sensor.
REFER to: Output Shaft Speed (OSS) Sensor (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).

PINPOINT TEST H: TRANSMISSION FLUID PRESSURE SENSOR A AND B DTCS

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

Transmission Fluid Pressure (TFP) sensors for clutches A and B have been added to improve diagnostic capability for non-electrical (stuck solenoid or control valve) faults. The TFP sensors provide a voltage proportional to the absolute hydraulic pressure in the transmission clutch control circuit using a piezo-resistive silicon sensing element. Pressure readings are used to monitor the status of specified clutch systems during operation. The typical operating output range is 0.5V to 4.5V. The pressure sensor is typically mounted on the transmission main control assembly with a dedicated feed port. TFP A sensor measures A clutch pressure, TFP B sensor measures B clutch pressure.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P0840:00 Transmission Fluid Pressure Sensor/Switch 'A' Circuit: No Sub Type Information This DTC sets with DTC s P0842 or P0843 and is used to illuminate the wrench light. Resolve the more specific DTC s first.
PCM P0841:00 Transmission Fluid Pressure Sensor/Switch 'A' Circuit Range/Performance: No Sub Type Information The PCM detected the A clutch is stuck off due to a non-electrical fault. Multiple attempts to apply the A clutch have failed.
PCM P0842:00 Transmission Fluid Pressure Sensor/Switch 'A' Circuit Low: No Sub Type Information The PCM detected that TFP A sensor voltage is out of range low.
PCM P0843:00 Transmission Fluid Pressure Sensor/Switch 'A' Circuit High: No Sub Type Information The PCM detected that TFP A sensor voltage is out of range high.
PCM P0845:00 Transmission Fluid Pressure Sensor/Switch 'B' Circuit: No Sub Type Information This DTC sets with DTC s P0847 or P0848 and is used to illuminate the wrench light. Resolve the more specific DTC s first.
PCM P0846:00 Transmission Fluid Pressure Sensor/Switch 'B' Circuit Range/Performance: No Sub Type Information The PCM detected the B clutch is stuck off due to a non-electrical fault. Multiple attempts to apply the B clutch have failed.
PCM P0847:00 Transmission Fluid Pressure Sensor/Switch 'B' Circuit Low: No Sub Type Information The PCM detected that TFP B sensor voltage is out of range low.
PCM P0848:00 Transmission Fluid Pressure Sensor/Switch 'B' Circuit High: No Sub Type Information The PCM detected that TFP B sensor voltage is out of range high.

Possible Sources

  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • Transmission fluid pressure sensor
  • Contamination in the main control
  • Damaged A or B clutch
H1 CHECK FOR ELECTRICAL DTCS
  • Connect the diagnostic tool.
  • Using a diagnostic scan tool perform self-test.

Are any electrical circuit DTCs for the transmission fluid pressure sensor retrieved?
Yes GO to H6
No GO to H2

H2 CHECK FOR OBSERVABLE SYMPTOMS
  • Using a diagnostic scan tool, clear the DTC s.
  • Shift the selector lever from Reverse to Drive to Neutral and back to Park.

Are any observable symptoms present?
Yes REFER to the Symptom Chart.
No GO to H3

H3 CHECK THE "A" AND "B" CLUTCH ENGAGEMENT STATE IN PARK
  • Ignition ON.
  • Clear DTC s.
  • Enter the following diagnostic mode: Datalogger.
  • Monitor the PID s TFP_A, TFP_B and TSS_SRC.
  • Select NEUTRAL.
  • Start the engine.

Are the PID s TFP_A, TFP_B below 0.6 volts and does the PID TSS_SRC show turbine shaft speed above 300 RPM?
Yes GO to H4
No INSTALL a new transmission fluid pressure sensor.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

H4 CHECK THE "A" CLUTCH ENGAGEMENT STATE IN FIRST GEAR
  • Monitor the PID s TFP_A and TSS_SRC.
  • Select FIRST.

Is the PID TFP_A between 1.0 and 2.0 volts and does the PID TSS_SRC show turbine shaft speed approximately 0 RPM?
Yes GO to H5
No INSTALL a new transmission fluid pressure sensor.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

H5 CHECK THE "B" CLUTCH ENGAGEMENT STATE IN REVERSE
  • Monitor the PID s TFP_B and TSS_SRC.
  • Select REVERSE.

Is the PID TFP_B between 1.0 and 2.0 volts and does the PID TSS_SRC show turbine shaft speed approximately 0 RPM?
Yes Both the A and B clutches are operating correctly at this time. Road test the vehicle and if any observable symptoms are present, REFER to the symptom chart.
No INSTALL a new transmission fluid pressure sensor.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

H6 CHECK TRANSMISSION FLUID PRESSURE SENSOR CIRCUIT FOR POWER
  • Ignition OFF.
  • Disconnect Transmission Vehicle Harness C1520 .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-1   Ground

Is the voltage approximately 5 volts?
Yes GO to H10
No GO to H7

H7 CHECK TRANSMISSION FLUID PRESSURE SENSOR POWER CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect PCM C1551E .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-1   C1551E-19

Is the resistance less than 3 ohms?
Yes GO to H8
No REPAIR the circuit.

H8 CHECK TRANSMISSION FLUID PRESSURE SENSOR POWER CIRCUIT FOR A SHORT TO GROUND
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-1   Ground

Is the resistance greater than 10,000 ohms?
Yes VERIFY all PCM power circuits and fuses. If no problem found,
   VIN required to access Guided Routine (PCM) CARRY OUT the transmission strategy download.
REFER to: Transmission Strategy Download (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
No GO to H9

H9 CHECK OTHER SENSORS THAT SHARE THE VREF CIRCUIT FOR A SHORT TO GROUND
  • Disconnect CMP bank 1 sensor 1 ( CMP 11) C180 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-1   Ground
  • Disconnect CMP bank 2 sensor 1 ( CMP 21) C1367 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-1   Ground

Does the resistance rise above 10,000 ohms when one of the sensors is disconnected?
Yes That sensor is shorted to ground. INSTALL a new sensor as necessary.
No REPAIR the circuit.

H10 CHECK TRANSMISSION FLUID PRESSURE SENSOR CIRCUITS FOR AN OPEN
  • Ignition OFF.
  • Disconnect PCM C1551E .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-20   C1551E-44
      C1520-19   C1551E-24
      C1520-21   C1551E-57

Are the resistances less than 3 ohms?
Yes GO to H11
No REPAIR the circuit.

H11 CHECK TRANSMISSION FLUID PRESSURE SENSOR CIRCUITS FOR A SHORT TO GROUND
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-20   Ground
      C1520-19   Ground
      C1520-21   Ground

Are the resistances greater than 10,000 ohms?
Yes GO to H12
No REPAIR the circuit.

H12 CHECK TRANSMISSION FLUID PRESSURE SENSOR CIRCUITS FOR A SHORT TOGETHER WITH THE POWER CIRCUITS
  • Disconnect PCM C1551B .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1551E-44   C1551E-19
      C1551E-44   C1551E-80
      C1551E-44   C1551E-70
      C1551E-44   C1551E-91
      C1551E-44   C1551E-92
      C1551E-44   C1551E-29
      C1551E-44   C1551E-95
      C1551E-44   C1551E-71
      C1551E-44   C1551B-93
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1551E-24   C1551E-19
      C1551E-24   C1551E-80
      C1551E-24   C1551E-70
      C1551E-24   C1551E-91
      C1551E-24   C1551E-92
      C1551E-24   C1551E-29
      C1551E-24   C1551E-95
      C1551E-24   C1551E-71
      C1551E-24   C1551B-93

    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1551E-57   C1551E-19
      C1551E-57   C1551E-80
      C1551E-57   C1551E-70
      C1551E-57   C1551E-91
      C1551E-57   C1551E-92
      C1551E-57   C1551E-29
      C1551E-57   C1551E-95
      C1551E-57   C1551E-71
      C1551E-57   C1551B-93

Are the resistance greater than 10,000 ohms?
Yes GO to H13
No REPAIR the circuit.

H13 CHECK INTERNAL WIRING HARNESS FOR AN OPEN CIRCUIT
  • Drain the transmission fluid and remove the main control cover.
    REFER to: Main Control Cover (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
  • Disconnect Transmission Fluid Pressure Sensor C1792 .
  • Measure:
    Positive Lead Measurement / Action Negative Lead
    Transmission Harness Connector, component side, pin 1   C1792-1
    Transmission Harness Connector, component side, pin 20   C1792-2
    Transmission Harness Connector, component side, pin 19   C1792-3
    Transmission Harness Connector, component side, pin 21   C1792-4

Are the resistances less than 3 ohms?
Yes GO to H14
No INSTALL a new internal wiring harness.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

H14 CHECK TRANSMISSION INTERNAL WIRING HARNESS FOR A SHORT TO GROUND
  • Measure:
    Positive Lead Measurement / Action Negative Lead
    Transmission Harness Connector, component side, pin 1   Ground
    Transmission Harness Connector, component side, pin 20   Ground
    Transmission Harness Connector, component side, pin 19   Ground
    Transmission Harness Connector, component side, pin 21   Ground

Are the resistances greater than 10,000 ohms?
Yes INSTALL a new transmission fluid pressure sensor.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
No INSTALL a new internal wiring harness.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

PINPOINT TEST I: PARK LOCK PAWL SOLENOID

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

The park lock pawl solenoid holds the vehicle ouf of park during short duration engine off events (start-stop events or stay in neutral mode). The spring loaded solenoid pin is extended at zero voltage, but retracts when force is applied against the pin. The force required to retract the pin increases as voltage is applied.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P07E4:00 Unable to Engage Park: No Sub Type Information The PCM commanded Park, but movement timed out and the TR sensor does not read Park.
PCM P07E6:00 Stuck in Park: No Sub Type Information The PCM commanded a movement out of Park, but movement timed out and the TR sensor still reads Park.
PCM P2888:00 Park Lock/Pawl Actuator Circuit/Open: No Sub Type Information The PCM detected an open circuit fault in the park lock pawl solenoid or circuitry.
PCM P2889:00 Park Lock/Pawl Actuator Circuit Low: No Sub Type Information The PCM detected a short to ground fault in the park lock pawl solenoid or circuitry.
PCM P288A:00 Park Lock/Pawl Actuator Circuit High: No Sub Type Information The PCM detected a short to power fault in the park lock pawl solenoid or circuitry.
PCM P288B:00 Park Lock/Pawl Actuator Circuit Performance: No Sub Type Information This DTC indicates a non-electrical fault causing the park lock pawl solenoid to be stuck off. This DTC sets if the park system returns to park uncommanded while the vehicle is in stay in neutral mode or during a start-stop event.

Possible Sources

  • Connectors damaged or pushed-out terminals, corrosion, loose wires or ground and missing or damaged seals
  • Park lock pawl solenoid
  • PCM
  • Contamination sticking Park Servo Valve in Park
I1 RETRIEVE AND RECORD ALL DTCS
  • Using the diagnostic scan tool, retrieve all DTC s.

Are DTC s DTCS P07E4, P07E6, P2888, P2889, P288A, P288B present?
Yes For DTC P07E4, GO to I2 For DTC P07E6, GO to I11
For DTC s DTC s P2888, P2889, P288A, P288B, GO to I3
No If no DTC s are set and a symptom is present, REFER to the symptom chart.
If there are no DTC s and no symptoms present, the system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or terminal issues.

I2 CONFIRM TRANSMISSION PARK IS NOT MANUALLY OVERRIDDEN
  • Connect the diagnostic tool.
  • Ignition ON.
  • Using the diagnostic scan tool monitor the PID TR_PARK_STAT.

Does the PID TR_PARK_STAT indicate the transmission is in mechanical override?
Yes REMOVE the transmission from mechanical override.
REFER to: Transmission Park by Wire Manual Release (307-05A Automatic Transmission External Controls - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
No GO to I11

I3 CHECK THE PARK LOCK PAWL SOLENOID TASV CIRCUIT FOR POWER
  • Ignition OFF.
  • Disconnect Transmission Vehicle Harness C1520 .
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-15   Ground

Is the voltage greater than 11 volts?
Yes GO to I6
No GO to I4

I4 CHECK THE PARK LOCK PAWL SOLENOID TASV CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect PCM C1551E .
  • Inspect the connector for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-15   C1551E-95

Is the resistance less than 3 ohms?
Yes GO to I5
No REPAIR the circuit.

I5 CHECK THE PARK LOCK PAWL SOLENOID TASV CIRCUIT FOR A SHORT TO GROUND
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-15   Ground

Is the resistance greater than 10, 000 ohms?
Yes
   VIN required to access Guided Routine (PCM)
No REPAIR the circuit.

I6 CHECK THE PARK LOCK PAWL SOLENOID CONTROL CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect Transmission Harness Connector C1520 (if not already disconnected) .
  • Disconnect: PCM C1551E
  • Inspect the connector for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-18   C1551E-87

Is the resistance less than 3 ohms?
Yes GO to I7
No REPAIR the circuit.

I7 CHECK THE PARK LOCK PAWL SOLENOID CONTROL CIRCUIT FOR A SHORT TO GROUND
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1520-18   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to I8
No REPAIR the circuit.

I8 CHECK THE PARK LOCK PAWL SOLENOID CONTROL CIRCUIT FOR A SHORT TOGETHER WITH THE POWER CIRCUITS
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C1551E-87   C1551E-19
      C1551E-87   C1551E-80
      C1551E-87   C1551E-70
      C1551E-87   C1551E-91
      C1551E-87   C1551E-92
      C1551E-87   C1551E-29
      C1551E-87   C1551E-95
      C1551E-87   C1551E-71
      C1551E-87   C1551B-93

Are the resistances greater than 10,000 ohms?
Yes GO to I9
No REPAIR the circuit

I9 CHECK THE INTERNAL WIRING HARNESS FOR AN OPEN
  • Drain the transmission fluid and remove the main control cover.
    REFER to: Main Control Cover (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
  • Disconnect Park Lock Pawl Solenoid C177 .
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C177-1 Transmission Harness Connector, component side, pin 15
      C177-2 Transmission Harness Connector, component side, pin 18

Are the resistances less than 3 ohms?
Yes GO to I10
No INSTALL a new internal wiring harness.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

I10 CHECK THE INTERNAL WIRING HARNESS FOR A SHORT TO GROUND
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C177-1   Ground
      C177-2   Ground

Are the resistances greater than 10,000 ohms?
Yes GO to I11
No INSTALL a new internal wiring harness.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

I11 CHECK THE PARK LOCK PAWL SOLENOID
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
    Park Lock Pawl Solenoid (Component side) pin 1. Park Lock Pawl Solenoid (Component side) pin 2.

Is the resistance between 18 and 20 ohms?
Yes GO to I12
No INSTALL a new park lock pawl solenoid.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

I12 CHECK PARK LOCK PAWL SOLENOID OPERATION
  • Ignition OFF.
  • Connect Transmission Harness Connector C1520 .
  • Connect PCM C1551E .
  • Connect Park Lock Pawl Solenoid C177 .
  • Remove the park lock pawl solenoid, leaving the wiring harness connected.
  • Push the park lock pawl solenoid pin with the ignition ON and OFF.

Does the park lock pawl solenoid pin resist motion with the ignition ON and move with the ignition OFF?
Yes The park by wire system is working correctly at this time. If symptoms exist, Engagement Quality-Park Symptom,
REFER to: Diagnosis By Symptom (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
No INSTALL a new park lock pawl solenoid.
REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

PINPOINT TEST J: P0702, P0882, P0883, P1397

Refer to Wiring Diagrams Cell 30 for schematic and connector information.

Normal Operation and Fault Conditions

The PCM monitors the supplied voltage and sets a DTC if supply voltage rises below or drops below threshold.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P0702:00 Transmission Control System Electrical: No Sub Type Information Sets in continuous memory and during the on-demand self-test when the PCM detects the supply voltage is greater than 16 volts.
PCM P0882:00 TCM Power Input Signal Low: No Sub Type Information Sets in continuous memory and during the on-demand self-test when the PCM detects the supply voltage is lower than 9 volts.
PCM P0883:00 TCM Power Input Signal High: No Sub Type Information Sets in continuous memory and during the on-demand self-test when the PCM detects the supply voltage is greater than 16 volts.
PCM P1397:00 System Voltage Out Of Self Test Range: No Sub Type Information Sets in continuous memory and during the on-demand self-test when the PCM detects the supply voltage is greater than 16 volts.

Possible Sources

  • Charging system concern
  • High resistance ground condition
  • Low voltage to the PCM

NOTE: DTC U3003:17 may be stored in the module memory due to past battery charging or vehicle jump starting events.

J1 RECHECK FOR THE VOLTAGE FAULTDTC (DIAGNOSTIC TROUBLE CODE) IN THE PCM (POWERTRAIN CONTROL MODULE)
  • Ignition OFF.
  • Disconnect and inspect all PCM connectors.
  • Repair:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent pins - install new terminals/pins
    • pushed-out pins - install new pins as necessary
  • Check the PCM power and ground circuits for opens or short to ground. Refer to the Wiring Diagrams to identify the cause of any circuit faults.
  • Reconnect all PCM connectors.
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC for the PCM .
  • Wait 10 seconds.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Are DTC s P0702, P0882, P0883 still present?
Yes DIAGNOSE the vehicle charging concern.
REFER to: Charging System - 2.0L EcoBoost (177kW/240PS) – MI4/2.3L EcoBoost (199kW/270PS) (414-00 Charging System - General Information, Diagnosis and Testing).
No If the PCM does not communicate with the scan tool,
REFER to: Communications Network (418-00 Module Communications Network, Diagnosis and Testing).
Otherwise, the system is operating properly at this time. The DTC may have been set previously during battery charging or while jump starting the vehicle.

PINPOINT TEST K: P0729

Normal Operation and Fault Conditions

The PCM monitors clutch applications for all gears. It sets a DTC if it detects ratio errors but is unable to detect which clutch caused the issue. The transmission logic disables the gear in question. If multiple incorrect gear ratio DTC s are set, look for common a clutch involved in the operation of those gear applications. If no common clutch errors are found look for line pressure or pump pressure issues.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P0729:00 Gear 6 Incorrect Ratio: No Sub Type Information The PCM detected ratio errors 4 times either in or while shifting to sixth gear. The ratio error did not last long enough for the PCM to isolate the fault to a specific clutch. The logic disabled sixth gear for the remainder of the current key cycle the fault occurred in. The DTC self clears after 40 warm up cycles have been completed without detecting the fault again.

Possible Sources

  • Transmission fluid contamination
  • A solenoid or A clutch stuck on
  • B solenoid or B clutch stuck off or slipping
  • E solenoid or E clutch slipping or damaged
K1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC from the PCM .
  • Road test the vehicle.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Is DTC P0729 present in the PCM ?
Yes
REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
REFER to: E Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
No The fault is not present at this time and may be intermittent.

PINPOINT TEST L: P0731

Normal Operation and Fault Conditions

The PCM monitors clutch applications for all gears. It sets a DTC if it detects ratio errors but is unable to detect which clutch caused the issue. The transmission logic disables the gear in question. If multiple incorrect gear ratio DTC s are set, look for common a clutch involved in the operation of those gear applications. If no common clutch errors are found look for line pressure or pump pressure issues.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P0731:00 Gear 1 Incorrect Ratio: No Sub Type Information The PCM detected ratio errors 4 times either in or while shifting to first gear. The ratio error did not last long enough for the PCM to isolate the fault to a specific clutch. The logic disabled first gear for the remainder of the current key cycle the fault occurred in. The DTC self clears after 40 warm up cycles have been completed without detecting the fault again.

Possible Sources

  • Transmission fluid contamination
  • A solenoid or A clutch stuck off or slipping
  • B solenoid or B clutch stuck on or damaged
  • Hydraulic selectable one-way clutch (SOWC) slipping or damaged
L1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC for the PCM .
  • Road test the vehicle.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Is DTC P0731 present in the PCM ?
Yes
REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
No The fault is not present at this time and may be intermittent.

PINPOINT TEST M: P0732

Normal Operation and Fault Conditions

The PCM monitors clutch applications for all gears. It sets a DTC if it detects ratio errors but is unable to detect which clutch caused the issue. The transmission logic disables the gear in question. If multiple incorrect gear ratio DTC s are set, look for common a clutch involved in the operation of those gear applications. If no common clutch errors are found look for line pressure or pump pressure issues.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P0732:00 Gear 2 Incorrect Ratio: No Sub Type Information The PCM detected ratio errors 4 times either in or while shifting to second gear. The ratio error did not last long enough for the PCM to isolate the fault to a specific clutch. The logic disabled second gear for the remainder of the current key cycle the fault occurred in. The DTC self clears after 40 warm up cycles have been completed without detecting the fault again.

Possible Sources

  • Transmission fluid contamination
  • A solenoid or A clutch slipping or damaged
  • Hydraulic selectable one-way clutch (SOWC) stuck on or damaged
  • F solenoid or F clutch stuck off or slipping
M1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC for the PCM .
  • Road test the vehicle.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Is DTC P0732 present in the PCM ?
Yes
REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
REFER to: F Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
No The fault is not present at this time and may be intermittent.

PINPOINT TEST N: P0733

Normal Operation and Fault Conditions

The PCM monitors clutch applications for all gears. It sets a DTC if it detects ratio errors but is unable to detect which clutch caused the issue. The transmission logic disables the gear in question. If multiple incorrect gear ratio DTC s are set, look for common a clutch involved in the operation of those gear applications. If no common clutch errors are found look for line pressure or pump pressure issues.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P0733:00 Gear 3 Incorrect Ratio: No Sub Type Information The PCM detected ratio errors 4 times either in or while shifting to third gear. The ratio error did not last long enough for the PCM to isolate the fault to a specific clutch. The logic disabled third gear for the remainder of the current key cycle the fault occurred in. The DTC self clears after 40 warm up cycles have been completed without detecting the fault again.

Possible Sources

  • Transmission fluid contamination
  • A solenoid or A clutch slipping or damaged
  • C solenoid or C clutch stuck off or slipping
  • F solenoid or F clutch stuck on or damaged
N1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC for the PCM .
  • Road test the vehicle.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Is DTC P0733 present in the PCM ?
Yes
REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
REFER to: C Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
REFER to: F Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
No The fault is not present at this time and may be intermittent.

PINPOINT TEST O: P0734

Normal Operation and Fault Conditions

The PCM monitors clutch applications for all gears. It sets a DTC if it detects ratio errors but is unable to detect which clutch caused the issue. The transmission logic disables the gear in question. If multiple incorrect gear ratio DTC s are set, look for common a clutch involved in the operation of those gear applications. If no common clutch errors are found look for line pressure or pump pressure issues.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P0734:00 Gear 4 Incorrect Ratio: No Sub Type Information The PCM detected ratio errors 4 times either in or while shifting to fourth gear. The ratio error did not last long enough for the PCM to isolate the fault to a specific clutch. The logic disabled fourth gear for the remainder of the current key cycle the fault occurred in. The DTC self clears after 40 warm up cycles have been completed without detecting the fault again.

Possible Sources

  • Transmission fluid contamination
  • A solenoid or A clutch slipping or damaged
  • B solenoid or B clutch stuck off or slipping
  • C solenoid or C clutch stuck on or damaged
O1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC for the PCM .
  • Road test the vehicle.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Is DTC P0734 present in the PCM ?
Yes
REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
REFER to: C Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
No The fault is not present at this time and may be intermittent.

PINPOINT TEST P: P0735

Normal Operation and Fault Conditions

The PCM monitors clutch applications for all gears. It sets a DTC if it detects ratio errors but is unable to detect which clutch caused the issue. The transmission logic disables the gear in question. If multiple incorrect gear ratio DTC s are set, look for common a clutch involved in the operation of those gear applications. If no common clutch errors are found look for line pressure or pump pressure issues.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P0735:00 Gear 5 Incorrect Ratio: No Sub Type Information The PCM detected ratio errors 4 times either in or while shifting to fifth gear. The ratio error did not last long enough for the PCM to isolate the fault to a specific clutch. The logic disabled fifth gear for the remainder of the current key cycle the fault occurred in. The DTC self clears after 40 warm up cycles have been completed without detecting the fault again.

Possible Sources

  • Transmission fluid contamination
  • A solenoid or A clutch stuck on or damaged
  • B solenoid or B clutch slipping or damaged
  • E solenoid or E clutch stuck off or slipping
P1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC for the PCM .
  • Road test the vehicle.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Is DTC P0735 present in the PCM ?
Yes
REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
REFER to: E Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
No The fault is not present at this time and may be intermittent.

PINPOINT TEST Q: P076F

Normal Operation and Fault Conditions

The PCM monitors clutch applications for all gears. It sets a DTC if it detects ratio errors but is unable to detect which clutch caused the issue. The transmission logic disables the gear in question. If multiple incorrect gear ratio DTC s are set, look for common a clutch involved in the operation of those gear applications. If no common clutch errors are found look for line pressure or pump pressure issues.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P076F:00 Gear 7 Incorrect Ratio: No Sub Type Information The PCM detected ratio errors 4 times either in or while shifting to seventh gear. The ratio error did not last long enough for the PCM to isolate the fault to a specific clutch. The logic disabled seventh gear for the remainder of the current key cycle the fault occurred in. The DTC self clears after 40 warm up cycles have been completed without detecting the fault again.

Possible Sources

  • Transmission fluid contamination
  • B solenoid or B clutch stuck on or damaged
  • C solenoid or C clutch stuck off or slipping
  • E solenoid or E clutch slipping or damaged
Q1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC for the PCM .
  • Road test the vehicle.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Is DTC P076F present in the PCM ?
Yes
REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
REFER to: C Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
REFER to: E Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
No The fault is not present at this time and may be intermittent.

PINPOINT TEST R: P07D9

Normal Operation and Fault Conditions

The PCM monitors clutch applications for all gears. It sets a DTC if it detects ratio errors but is unable to detect which clutch caused the issue. The transmission logic disables the gear in question. If multiple incorrect gear ratio DTC s are set, look for common a clutch involved in the operation of those gear applications. If no common clutch errors are found look for line pressure or pump pressure issues.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P07D9:00 Gear 8 Incorrect Ratio: No Sub Type Information The PCM detected ratio errors 4 times either in or while shifting to eighth gear. The ratio error did not last long enough for the PCM to isolate the fault to a specific clutch. The logic disabled eighth gear for the remainder of the current key cycle the fault occurred in. The DTC self clears after 40 warm up cycles have been completed without detecting the fault again.

Possible Sources

  • Transmission fluid contamination
  • C solenoid or C clutch stuck on or damaged
  • E solenoid or E clutch slipping or damaged
  • F solenoid or F clutch stuck off or slipping
R1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC for the PCM .
  • Road test the vehicle.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Is DTC P07D9 present in the PCM ?
Yes
REFER to: C Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
REFER to: E Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
REFER to: F Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
No The fault is not present at this time and may be intermittent.

PINPOINT TEST S: P0736

Normal Operation and Fault Conditions

The PCM monitors clutch applications for all gears. It sets a DTC if it detects ratio errors but is unable to detect which clutch caused the issue. The transmission logic disables the gear in question. If multiple incorrect gear ratio DTC s are set, look for common a clutch involved in the operation of those gear applications. If no common clutch errors are found look for line pressure or pump pressure issues.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P0736:00 Reverse Incorrect Ratio: No Sub Type Information The PCM detected ratio errors 4 times either in or while shifting to reverse gear. The ratio error did not last long enough for the PCM to isolate the fault to a specific clutch. The logic disabled reverse gear for the remainder of the current key cycle the fault occurred in. The DTC self clears after 40 warm up cycles have been completed without detecting the fault again.

Possible Sources

  • Transmission fluid contamination
  • A solenoid or A clutch stuck on or damaged
  • B solenoid or B clutch stuck off or slipping
  • Hydraulic selectable one-way clutch (SOWC) stuck off or damaged
S1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC for the PCM .
  • Road test the vehicle.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Is DTC P0736 present in the PCM ?
Yes
REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
No The fault is not present at this time and may be intermittent.

PINPOINT TEST T: P073D

Normal Operation and Fault Conditions

The PCM monitors clutch applications for all gears. It sets a DTC if it detects a forward or reverse gear when park or neutral is selected.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P073D:00 Unable to Engage Neutral: No Sub Type Information The PCM detected gear engagement 3 times while park or neutral was selected. The error did not last long enough for the PCM to isolate the fault to a specific clutch. The logic triggers a temporary neutral command each time the fault occurs. The DTC self clears after 40 warm up cycles have been completed without detecting the fault again.

Possible Sources

  • Transmission fluid contamination
  • A solenoid or A clutch stuck on or damaged
  • B solenoid or B clutch stuck on or damaged
  • Non-electrical TSS sensor fault
T1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC for the PCM .
  • Road test the vehicle.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Is DTC P0736 present in the PCM ?
Yes
REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
For non-electrical TSS sensor faults, GO to Pinpoint Test G
No The fault is not present at this time and may be intermittent.

PINPOINT TEST U: P073E

Normal Operation and Fault Conditions

The PCM monitors clutch applications for all gears. It sets a DTC if it detects a forward gear engagement while reverse is selected.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P073E:00 Unable to Engage Reverse: No Sub Type Information The PCM detected forward gear engagement 3 times while Reverse was selected. The PCM was not able to isolate the fault to a specific clutch. The logic triggers a temporary neutral command each time the fault occurs. The DTC self clears after 40 warm up cycles have been completed without detecting the fault again.

Possible Sources

  • Transmission fluid contamination
  • A solenoid or A clutch stuck on or damaged
  • B solenoid or B clutch stuck off or slipping
  • Hydraulic selectable one-way clutch (SOWC) damaged
U1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC for the PCM .
  • Road test the vehicle.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Is DTC P0736 present in the PCM ?
Yes
REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
No The fault is not present at this time and may be intermittent.

PINPOINT TEST V: P073F

Normal Operation and Fault Conditions

The PCM monitors clutch applications for all gears. It sets a DTC if it detects reverse engagement while a forward gear is selected.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P073F:00 Unable to Engage Gear 1: No Sub Type Information The PCM detected reverse gear engagement 3 times while a forward gear is selected. The PCM was unable to isolate the fault to a specific clutch. The logic triggers a temporary neutral command each time the fault occurs. The DTC self clears after 40 warm up cycles have been completed without detecting the fault again.

Possible Sources

  • Transmission fluid contamination
  • A solenoid or A clutch stuck off or slipping
  • B solenoid or B clutch stuck on or damaged
  • Hydraulic selectable one-way clutch (SOWC) damaged
V1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC for the PCM .
  • Road test the vehicle.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Is DTC P0731 present in the PCM ?
Yes
REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
No The fault is not present at this time and may be intermittent.

PINPOINT TEST W: P0741

Normal Operation and Fault Conditions

The PCM monitors clutch applications. It sets a DTC if it detects a non-electrical fault in the TCC .

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P0741:00 Torque Converter Clutch Solenoid Circuit Performance/Stuck Off: No Sub Type Information The PCM detected TCC slip greater than 80rpm for 1 second on 3 different TCC lock ups. The logic disabled TCC lock for the remainder of the current key cycle the fault occurred in. The DTC self clears after 40 warm up cycles have been completed without detecting the fault again.

Possible Sources

  • Non-electrical TCC solenoid stuck off
  • TCC mechanical failure
  • Seal faults causing loss of pressure
  • TCC regulator control valve stuck in TCC release position
W1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC for the PCM .
  • Road test the vehicle.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Is DTC P0741 present in the PCM ?
Yes
REFER to: Torque Converter Clutch (TCC) (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
No The fault is not present at this time and may be intermittent.

PINPOINT TEST X: P0751, P0756, P0761, P0766, P0771, P2707

Normal Operation and Fault Conditions

The PCM monitors clutch applications. It sets a DTC if it detects a non-electrical fault in the shift solenoids or clutches.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P0751:00 Shift Solenoid 'A' Performance/Stuck Off: No Sub Type Information DTC P0751 is a non-electrical failure indicating the A clutch failed to apply. When this DTC sets the failsafe logic disables all gears that use clutch A. Clutch A is used for 1st through 5th gears and only allows reverse and 6th through 8th gears.
PCM P0756:00 Shift Solenoid 'B' Performance/Stuck Off: No Sub Type Information DTC P0756 is a non-electrical failure indicating the B clutch failed to apply. When this DTC sets the failsafe logic disables all gears that use clutch B. Clutch B is on in reverse, 4th and 6th gears and only allows 1st, 2nd, 3rd, 5th, 7th, and 8th gears.
PCM P0761:00 Shift Solenoid 'C' Performance/Stuck Off: No Sub Type Information DTC P0761 is a non-electrical failure indicating the C clutch failed to apply. When this DTC sets the failsafe logic disables all gears that use clutch C. Clutch C is used for 3rd and 7th and only allows reverse, 1st, 2nd, 4th, 5th, 6th, and 8th gears.
PCM P0766:00 Shift Solenoid 'D' Performance/Stuck Off: No Sub Type Information DTC P0766 is a non-electrical failure indicating the hydraulic SOWC failed to apply. When this DTC sets the failsafe logic disables all gears that use the hydraulic SOWC . The hydraulic SOWC is used for reverse and 1st gear and only allows 2nd through 8th gears.
PCM P0771:00 Shift Solenoid 'E' Performance/Stuck Off: No Sub Type Information DTC P0771 is a non-electrical failure indicating the E clutch failed to apply. When this DTC sets the failsafe logic disables all gears that use clutch E. Clutch E is used for 5th through 8th gears and only allows reverse and 1st through 4th gears.
PCM P2707:00 Shift Solenoid 'F' Performance/Stuck Off: No Sub Type Information DTC P2707 is a non-electrical failure indicating the F clutch failed to apply. When this DTC sets the failsafe logic disables all gears that use clutch F. Clutch F is used for 2nd and 8th gears and only allows reverse, 1st, and 3rd through 7th gears.

Possible Sources

  • Shift solenoid stuck off
  • Stuck control valve
  • Contamination in the main control
  • Clutch damaged
  • Faulty seal
X1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC for the PCM .
  • Road test the vehicle.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Are DTC s P0751, P0756, P0761, P0766, P0771, P2707 present in the PCM ?
Yes DTC P0751, A clutch Does Not Apply symptom,
REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing). DTC P0756, B clutch Does Not Apply symptom,
REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing). DTC P0761, C clutch Does Not Apply symptom,
REFER to: C Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing). DTC P0766, D clutch Does Not Apply symptom,
REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing). DTC P0771, E clutch Does Not Apply symptom,
REFER to: E Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing). DTC P2707, F clutch Does Not Apply symptom,
REFER to: F Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
No The fault is not present at this time and may be intermittent.

PINPOINT TEST Y: P0752, P0757, P0762, P0767, P0772, P2808

Normal Operation and Fault Conditions

The PCM monitors clutch applications. It sets a DTC if it detects a non-electrical shift solenoid or clutch fault. The customer may experience erratic vehicle operation when this DTC sets.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P0752:00 Shift Solenoid 'A' Stuck On: No Sub Type Information DTC P0752 is a non-electrical failure indicating the A clutch stayed applied when SSA was de-energized. When this DTC sets the failsafe logic disables all gears that operate when clutch A is off, which only allows 1st through 5th gears.
PCM P0757:00 Shift Solenoid 'B' Stuck On: No Sub Type Information DTC P0757 is a non-electrical failure indicating the B clutch stayed applied when SSB was de-energized. When this DTC sets the failsafe logic disables all gears that operate when clutch B is off, which only allows reverse, 4th, and 6th gears.
PCM P0762:00 Shift Solenoid 'C' Stuck On: No Sub Type Information DTC P0762 is a non-electrical failure indicating the C clutch stayed applied when SSC was de-energized. When this DTC sets the failsafe logic disables all gears that operate when clutch C is off, which only allows 3rd and 7th gears.
PCM P0767:00 Shift Solenoid 'D' Stuck On: No Sub Type Information DTC P0767 is a non-electrical failure indicating the hydraulic SOWC stayed applied when SSD was de-energized. When this DTC sets the failsafe logic disables all gears that operate when the hydraulic SOWC is off, which only allows reverse and 1st gear.
PCM P0772:00 Shift Solenoid 'E' Stuck On: No Sub Type Information DTC P0772 is a non-electrical failure indicating the E clutch stayed applied when SSE was de-energized. When this DTC sets the failsafe logic disables all gears that operate when clutch E is off, which only allows 5th through 8th gears.
PCM P2708:00 Shift Solenoid 'F' Stuck On: No Sub Type Information DTC P2708 is a non-electrical failure indicating the F clutch stayed applied when SSF was de-energized. When this DTC sets the failsafe logic disables all gears that operate when clutch F is off, which only allows 2nd and 8th gears.
PCM P2758:00 Torque Converter Clutch Pressure Control Solenoid Stuck On: No Sub Type Information DTC P2758 is a non-electrical failure indicating the TCC stayed applied when the TCC solenoid was de-energized. When this DTC sets the vehicle may experience engine stalling, lugging, poor shift quality.

Possible Sources

  • Shift solenoid stuck on
  • Stuck control valve
  • Contamination in the main control
  • Clutch damaged
Y1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC for the PCM .
  • Road test the vehicle.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Are DTC s P0752, P0757, P0762, P0767, P0772, P2708, P2758 present in the PCM ?
Yes DTC P0752, A clutch Always Applied symptom,
REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing). DTC P0757, B clutch Always Applied symptom,
REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing). DTC P0762, C clutch Always Applied symptom,
REFER to: C Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing). DTC P0767, D clutch Always Applied symptom,
REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing). DTC P0772, E clutch Always Applied symptom,
REFER to: E Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing). DTC P2708, F clutch Always Applied symptom,
REFER to: F Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing). DTC P2758, TCC Always Applied symptom,
REFER to: Torque Converter Clutch (TCC) (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
No The fault is not present at this time and may be intermittent.

PINPOINT TEST Z: P0868

Normal Operation and Fault Conditions

The PCM monitors the transmission fluid pressure at all times to ensure proper transmission operation. It sets a DTC if it detects low pressure.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P0868:00 Transmission Fluid Pressure Low: No Sub Type Information The PCM detected multiple clutch stuck off DTC s. This DTC may set in conjunction with P0751, P0756, P0761, P0766, P0771 or P2707. The DTC self clears after 40 warm up cycles have been completed without detecting the fault again.
PCM P0869:00 Transmission Fluid Pressure High: No Sub Type Information The PCM received a high reading from the clutch B pressure sensor on 2 key cycles. When this DTC sets, the failsafe logic disables 4th and 6th gears and limits rpms in R. The DTC self clears after 40 warm up cycles have been completed without detecting the fault again.

Possible Sources

  • Transmission fluid contamination
  • Pump failure
Z1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC for the PCM .
  • Road test the vehicle.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Is DTC P0868 present in the PCM ?
Yes CLEAR the DTC . Road test vehicle, if DTC P0868 returns, TEST for proper pump pressure. PERFORM the line pressure test.
REFER to: Special Testing Procedures (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
No The fault is not present at this time and may be intermittent.

PINPOINT TEST AA: P1001

Normal Operation and Fault Conditions

The PCM only runs the KOER test when the PCM confirms the vehicle is in park or neutral and there is no vehicle speed indicated.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P1001:00 KOER Not Able to Complete, KOER Aborted: No Sub Type Information The KOER self-test timed out. The test did not complete within 4-1/2 minutes. The vehicle speed is greater than  mph (  km/h) after self-test is initiated. The transmission range is not in Park or Neutral after self-test is initiated.

Possible Sources

  • KOER entry conditions not correct upon start of self-test
  • Operator changed vehicle state during self-test
  • Other vehicle concers that prevented self-test completion in a timely manner
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST AB: P1636

Normal Operation and Fault Conditions

The PCM uses internal drivers that control the solenoid low sides to provide commanded current. These internal drivers communicate with the PCM internally.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P1636:00 Inductive Signature Chip Communication Error: No Sub Type Information The PCM uses internal drivers that control the solenoid low sides to provide commanded current. These internal drivers communicate with the PCM . If communication is lost with the solenoid drivers the DTC P1636 sets .

Possible Sources

  • Internal PCM component failure
AB1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC for the PCM .
  • Wait 10 seconds.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Is DTC P1636 present in the PCM ?
Yes
   VIN required to access Guided Routine (PCM)
No The fault is not present at this time and may be intermittent.

PINPOINT TEST AC: P163E, P163F

Normal Operation and Fault Conditions

The PCM stores the transmission identification information in memory. The transmission identification information is located on the label on the side of the transmission.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P163E:00 Transmission Control Module Programming Error: No Sub Type Information This DTC sets if the transmission identification does not match the version stored in the PCM calibration.
PCM P163F:00 Transmission ID Block Corrupted, Not Programmed: No Sub Type Information This DTC sets if the transmission identification is not programmed in the PCM calibration.

Possible Sources

  • Incorrect or corrupted PCM calibration.
AC1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, Perform the transmission stratedgy download.
    REFER to: Transmission Strategy Download (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
  • Wait 10 seconds.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Is DTC P163E or P163F present in the PCM ?
Yes
   VIN required to access Guided Routine (PCM)
No The fault is not present at this time.

PINPOINT TEST AD: P1744

Normal Operation and Fault Conditions

The PCM monitors the TCC and sets a DTC if it falls outside of expected performance ranges.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P1744:00 Torque Converter Clutch Solenoid Circuit Performance: No Sub Type Information P1744 is a non-electrical DTC . This DTC sets with DTC P0741 TCC stuck off) or DTC P2758 ( TCC stuck off) and is used to illuminate the wrench light.

Possible Sources

  • Transmission may overheat if the TCC is continuously open
  • TCC valve body control valve stuck off or on
  • Seal faults causing loss of pressure
  • TCC mechanical failure
AD1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC for the PCM .
  • Wait 10 seconds.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Did DTC P1744 return?
Yes GO to Pinpoint Test AM
No The fault may be intermittent.

PINPOINT TEST AE: P1783

Refer to Wiring Diagrams Cell 30 for schematic and connector information.

Normal Operation and Fault Conditions

The PCM monitors transmission temperature and if it exceeds normal operating temperatures it sets a DTC . It may even limit powertrain torque to prevent damage to the transmission.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P1783:00 Transmission Overtemperature Condition: No Sub Type Information Sets in continuous memory and during the on-demand self-test when the PCM detects an transmission overheating concern and may limit torque to prevent critical transmission overheating. The DTC P0218 may set in conjunction with DTC P1783.

Possible Sources

  • Transmission overheating concern
AE1 RECHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC s for the PCM .
  • Road test the vehicle.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Is DTC s P1783 still present?
Yes If any TFT sensor circuit DTC s are present, resolve those first. If only DTC P1783 returns,
REFER to: Transmission Cooling (307-02A Transmission Cooling - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
No The system is operating correctly at this time. The DTC may have been set due to an extreme driving condition.

PINPOINT TEST AF: P1A02

Normal Operation and Fault Conditions

The PCM monitors the one way clutch application. It sets a DTC if it falls outside of expected performance ranges.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P1A02:00 Transmission One Way Clutch Performance: No Sub Type Information This DTC sets if the PCM detects the one way clutch failed to engage gears 1A or 2A 3 times allowing sun gear 1 to rotate backwards. When this DTC sets the failsafe logic disables 1st and 2nd gear.

Possible Sources

  • One-way clutch failure
AF1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC for the PCM .
  • Wait 10 seconds.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Did DTC P1A02 return?
Yes
REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
No The fault may be intermittent.

PINPOINT TEST AG: P26C3

Normal Operation and Fault Conditions

The PCM monitors the TR sensor. It sets a DTC if it falls outside of expected performance ranges.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P26C3:00 Internal Control Module Transmission Range Sensor Performance: No Sub Type Information This DTC sets if TR sensors A and B are out of range or do not correlate.

Possible Sources

  • TR sensor A out of range
  • TR sensor B out of range
  • TR sensors A and B correlation error
AG1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC for the PCM .
  • Wait 10 seconds.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Is DTC P26C3 present in the PCM ?
Yes INSTALL a new TR sensor.
REFER to: Transmission Range (TR) Sensor (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).
No The fault may be intermittent.

PINPOINT TEST AH: P2700, P2701, P2702, P2703, P2704, 2705

Normal Operation and Fault Conditions

The PCM monitors clutch applications if a non electrical fault is detected for the clutches a DTC is set in memory.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P2700:00 Transmission Friction Element 'A' Apply Time Range/Performance: No Sub Type Information DTC is set with either P0751 or P0752, if either of these DTC s are set resolve them first.
PCM P2701:00 Transmission Friction Element 'B' Apply Time Range/Performance: No Sub Type Information DTC is set with either P0761 or P0757, if either of these DTC s are set resolve them first.
PCM P2702:00 Transmission Friction Element 'C' Apply Time Range/Performance: No Sub Type Information DTC is set with either P0761 or P0762, if either of these DTC s are set resolve them first.
PCM P2703:00 Transmission Friction Element 'D' Apply Time Range/Performance: No Sub Type Information DTC is set with either P0766 or P0767, if either of these DTC s are set resolve them first.
PCM P2704:00 Transmission Friction Element 'E' Apply Time Range/Performance: No Sub Type Information DTC is set with either P0771 or P0772, if either of these DTC s are set resolve them first.
PCM P2705:00 Transmission Friction Element 'F' Apply Time Range/Performance: No Sub Type Information DTC is set with either P2707 or P2708, if either of these DTC s are set resolve them first.

Possible Sources

  • Clutch stuck on
  • Clutch stuck off
  • Clutch damaged
AH1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC for the PCM .
  • Road test the vehicle.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Are DTC s P2700, P2701, P2702, P2703, P2704, P2705 present in the PCM ?
Yes If either DTC P0751 or P0752 are set resolve them first. Otherwise, for DTC P2700,
REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing). If either DTC P0756 or P0757 are set resolve them first. Otherwise, for DTC P2701,
REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing). If either DTC P0761 or P0762 are set resolve them first. Otherwise, for DTC P2702,
REFER to: C Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing). If either DTC P0766 or P0767 are set resolve them first. Otherwise, for DTC P2703,
REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing). If either DTC P0771 or P0772 are set resolve them first. Otherwise, for DTC P2704,
REFER to: E Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing). If either DTC P2707 or P2708 are set resolve them first. Otherwise, for DTC P2705,
REFER to: F Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
No The fault is not present at this time and may be intermittent.

PINPOINT TEST AI: P2783

Normal Operation and Fault Conditions

The PCM monitors the transmission fluid temperature at all times and if the TCC control valve is stuck in a position that provides no flow when the TCC is commanded off it may cause the TCC to overheat.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P2783:00 Torque Converter Temperature Too High: No Sub Type Information The TCC control valve is stuck in a position that provides no flow when the TCC is commanded off. The TCC pumps down when commanded off, causing loss of torque multiplication through the TCC . This can cause the TCC to overheat.

Possible Sources

  • Transmission fluid contamination
  • TCC solenoid failure
  • TCC failure
AI1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC for the PCM .
  • Road test the vehicle.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Is DTC P2783 present in the PCM ?
Yes
REFER to: Torque Converter Clutch (TCC) (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
No The fault is not present at this time and may be intermittent.

PINPOINT TEST AJ: P27B2, P27B3, P27B4, P27B5, P27B6

Normal Operation and Fault Conditions

The PCM monitors clutch engagements and when a fault occurs a DTC is set in memory.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
PCM P27B2:00 Internal Control Module Transmission Range Control Performance: No Sub Type Information The DTC sets if the PCM detects clutch faults that cause an engagement in neutral, reverse engagement in a forward gear, or forward engagement in reverse.
PCM P27B3:00 Internal Control Module Transmission Gear Select Performance: No Sub Type Information The DTC sets if the PCM detects clutch faults that cause tie-ups, a software error or speed sensor fault.
PCM P27B4:00 Internal Control Module Transmission Gear Direction Control Performance: No Sub Type Information The DTC sets if the PCM detects clutch faults that cause tie-ups, a software error or speed sensor fault.
PCM P27B5:00 Internal Control Module Transmission Gear Ratio Control Performance: No Sub Type Information The DTC sets if the PCM detects clutch faults or a software error.
PCM P27B6:00 Internal Control Module Transmission Speed Sensor Performance: No Sub Type Information The DTC sets if the PCM detects clutch faults, a speed sensor fault or a software error.

Possible Sources

  • Clutch faults that cause an engagement in N, R, or a forward gear in R, reverse in a forward gear, or clutch tie up
  • Software error
AJ1 CHECK CORRECT GEAR STATE IS ACHIEVED
  • Ignition ON.
  • Using a diagnostic scan tool, monitor the PID, Transmission Range (TR) Sensor Position - Corrected.
  • Select DRIVE.

Does the achieved gear range match the customer selected gear position?
Yes GO to AJ2
No GO to Pinpoint Test C

AJ2 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, clear the DTC for the PCM .
  • Wait 10 seconds.
  • Using a diagnostic scan tool, carry out the PCM self-test.

Do DTC s P27B2, P27B3, P27B4, P27B5, P27B6 return?
Yes If any TR sensor DTC s are set, resolve those first. If DTC P27B2, P27B3, P27B4, P27B5 or P27B6 return by itself,
   VIN required to access Guided Routine (PCM)
No The fault may be intermittent.

PINPOINT TEST AK: ENGAGEMENT CONCERNS

Normal Operation and Fault Conditions

  • Unable to engage Gear 1
    • Check B clutch for being stuck on. REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check A clutch for being stuck off.REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the hydraulic SOWC for being stuck off. REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Harsh reverse
    • Check B clutch for damage.REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the hydraulic SOWC for damage. REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Harsh forward
    • Check A clutch for damage. REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the hydraulic SOWC for damage. REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Delayed/soft reverse
    • Check the transmission fluid level.REFER to: Transmission Fluid Level Check (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
    • Check line pressure. REFER to: Special Testing Procedures (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check B clutch for damage.REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the hydraulic SOWC for damage. REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Delayed soft/forward
    • Check the transmission fluid level. REFER to: Transmission Fluid Level Check (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
    • Check line pressure.REFER to: Special Testing Procedures (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check A clutch for damage.REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the hydraulic SOWC for damage. REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • No forward and no reverse
    • Check the transmission fluid level.REFER to: Transmission Fluid Level Check (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
    • Inspect the filter and filter to pump seal/gasket.REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
    • Inspect the pump assembly. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
    • Inspect main pressure regulator valve for damage, scoring, or sticking. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
    • Inspect turbine shaft splines on transmission input shaft and in the torque converter turbine.REPLACE damaged components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
  • Delayed/soft forward and reverse
    • Check the transmission fluid level. REFER to: Transmission Fluid Level Check (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
    • Check line pressure. REFER to: Special Testing Procedures (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Inspect the filter and filter to pump seal/gasket.REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
    • Inspect main pressure regulator valve for damage, scoring, or sticking. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
    • Inspect the pump assembly. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
  • Neutral after launch
    • Check the hydraulic SOWC for damage. REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Harsh/soft/delayed engagement after start/stop restart.
    • Inspect the auto start-stop accumulator for external leaks. If leaks are found, INSTALL a new auto start-stop accumulator.REFER to: Auto-Start-Stop Accumulator (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Removal and Installation).

Possible Sources

  • Transmission fluid level
  • Line pressure
  • Internal transmission components
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST AL: SHIFT CONCERNS

Normal Operation and Fault Conditions

  • Slip on hard acceleration in 1st or 2nd
    • Check the hydraulic SOWC for damage or wear. REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • No 1-2 shift/harsh/soft/slipping
    • Check the hydraulic SOWC for being seized/stuck holding. REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the A and F clutches for delayed/soft/slipping apply.REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
      REFER to: F Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • No 2-3 shift/harsh/soft/slipping
    • Check the A and C clutches for delayed/soft/slipping apply. REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
      REFER to: C Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the F clutch for being stuck on.REFER to: F Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the hydraulic SOWC for damage or wear.REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • No 3-4 shift/harsh/soft/slipping
    • Check the A and B clutches for delayed/soft/slipping apply. REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
      REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the C clutch for being stuck on. REFER to: C Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the hydraulic SOWC for damage or wear.REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • No 4-5 shift/harsh/soft/slipping
    • Check the A and E clutches for delayed/soft/slipping apply.REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
      REFER to: E Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the B clutch for being stuck on.REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the hydraulic SOWC for damage or wear.REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • No 5-6 shift/harsh/soft/slipping
    • Check the B and E clutches for delayed/soft/slipping apply. REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
      REFER to: E Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the A clutch for being stuck on.REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the hydraulic SOWC for damage or wear.REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • No 6-7 shift/harsh/soft/slipping
    • Check the C and E clutches for delayed/soft/slipping apply. REFER to: C Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
      REFER to: E Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the B clutch for being stuck on. REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the hydraulic SOWC for damage or wear.REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • No 7-8 shift/harsh/soft/slipping
    • Check the E and F clutches for delayed/soft/slipping apply. REFER to: E Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
      REFER to: F Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the C clutch for being stuck on. REFER to: C Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the hydraulic SOWC for damage or wear.REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Only gears 1, 2, 3, 4, 5 available
    • Check the A clutch for being stuck on. REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Only gears R, 6, 7, 8, available
    • Check the A clutch for being stuck off. REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Only gears R, 4, 6 available
    • Check the B clutch for being stuck on. REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Only gears 1, 2, 3, 5, 7, 8 available
    • Check the B clutch for being stuck off. REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Only gears 3, 7 available
    • Check the C clutch for being stuck on. REFER to: C Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Only gears R, 1, 2, 4, 5, 6, 8 available
    • Check the C clutch for being stuck off. REFER to: C Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Only gears R, 1 available
    • Check the hydraulic SOWC for being seized/stuck holding. REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Only gears 2, 3, 4, 5, 6, 7, 8 available
    • Check the hydraulic SOWC for damage or wear.REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Only gears 5, 6, 7, 8 available
    • Check the E clutch for being stuck on. REFER to: E Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Only gears R, 1, 2, 3, 4 available
    • Check the E clutch for being stuck off. REFER to: E Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Only gears 2, 8 available
    • Check the F clutch for being stuck on. REFER to: F Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Only gears R, 1, 3, 4, 5, 6, 7 available
    • Check the F clutch for being stuck off. REFER to: F Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • No engine braking in M1 or M2
    • Check the B clutch for being stuck off. REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).

Possible Sources

  • Internal transmission components
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST AM: TORQUE CONVERTER OPERATION CONCERNS

Normal Operation and Fault Conditions

  • No apply
    • Check for DTC s related to torque converter concerns.
    • Inspect the torque converter hydraulic circuits and regulator valve for damage or wear. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
      REFER to: Torque Converter Clutch (TCC) (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Always applied (engine stalls)
    • Check for DTC s related to torque converter concerns.
    • Inspect the torque converter hydraulic circuits and regulator valve for damage or wear.REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
      REFER to: Torque Converter Clutch (TCC) (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Cycling/shutter/chatter
    • Check for DTC s related to torque converter concerns.
    • Check the transmission fluid level. REFER to: Transmission Fluid Level Check (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
    • Inspect the torque converter hydraulic circuits and regulator valve for damage or wear. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
      REFER to: Torque Converter Clutch (TCC) (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).

Possible Sources

  • Transmission fluid level
  • Torque converter clutch or circuitry
  • Internal transmission components
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST AN: PARK ENGAGEMENT CONCERNS

Normal Operation and Fault Conditions

  • Park does not engage
    • Verify park is not manually released. REFER to: Transmission Park by Wire Manual Release (307-05A Automatic Transmission External Controls - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
    • Resolve all GSM diagnostic trouble codes (DTCs). REFER to: External Controls (307-05A Automatic Transmission External Controls - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the park lock pawl solenoid pin for being stuck extended. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
    • Check the park servo valve and bore for wear or damage. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
    • Check the internal transmission park components for wear or damage. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
  • Vehicle is stuck in park
    • Resolve all GSM diagnostic trouble codes (DTCs). REFER to: External Controls (307-05A Automatic Transmission External Controls - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the park servo valve and bore for wear or damage. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
    • Check the internal transmission park components for wear or damage. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
  • Park engages during start-stop events or while in stay in neutral mode
    • Resolve all GSM diagnostic trouble codes (DTCs). REFER to: External Controls (307-05A Automatic Transmission External Controls - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the park lock pawl solenoid pin for being stuck retracted. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
    • Check the park servo valve and bore for wear or damage. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
    • Check the internal transmission park components for wear or damage. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

Possible Sources

  • Park is manually released
  • GSM
  • Internal transmission components
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST AO: OTHER CONCERNS

Normal Operation and Fault Conditions

  • External leaks
    • Check for damaged or worn seals.REFER to: Leakage Inspection (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Noise
    • Check the engine drive accessories, suspension, CV joints. REFER to: Noise, Vibration and Harshness (NVH) (100-04 Noise, Vibration and Harshness, Diagnosis and Testing).
  • Vibration
    • Check the engine drive accessories, suspension, CV joints, transmission fluid cooler tubes. REFER to: Noise, Vibration and Harshness (NVH) (100-04 Noise, Vibration and Harshness, Diagnosis and Testing).
    • Inspect the park pawl and the park pawl actuator for damage or wear. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
  • Overheating
    • Check the transmission fluid cooling system for damage. REFER to: Transmission Cooling (307-02A Transmission Cooling - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).

Possible Sources

  • Transmission seals
  • Transmission cooling system
  • Internal transmission components
  • Drivetrain components
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

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    Lincoln Corsair. Information on P Type Tires

    P215/65R15 95H is an example of a tire size, load index and speed rating. The definitions of these items are listed below. (Note that the tire size, load index and speed rating for your vehicle may be different from this example.)

    P: Indicates a tire, designated by the Tire and Rim Association, that may be used for service on cars, sport utility vehicles, minivans and light trucks. Note: If your tire size does not begin with a letter this may mean it is designated by either the European Tire and Rim Technical Organization or the Japan Tire Manufacturing Association. 215: Indicates the nominal width of the tire in millimeters from sidewall edge to sidewall edge. In general, the larger the number, the wider the tire. 65: Indicates the aspect ratio which gives the tire's ratio of height to width. R: Indicates a radial type tire. 15: Indicates the wheel or rim diameter in inches. If you change your wheel size, you will have to purchase new tires to match the new wheel diameter. 95: Indicates the tire's load index. It is an index that relates to how much weight a tire can carry. You may find this information in your owner’s manual. If not, contact a local tire dealer.

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