Lincoln Corsair Manuals

Lincoln Corsair: Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40 / Diagnosis and Testing - Diagnosis By Symptom

Lincoln Corsair 2020-2024 Service Manual / Powertrain / Automatic Transmission / Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40 / Diagnosis and Testing - Diagnosis By Symptom

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. Each pinpoint test lists the possible symptoms and the components that can cause each symptom. The components are listed in order of disassembly.

NOTE: This procedure is written to diagnose multiple vehicle applications. It includes information for shift by cable, shift by wire, and auto start-stop applications. Some components listed may not apply to every vehicle.


  Symptom Chart


Condition Action
No Engagement - Forward   GO to Pinpoint Test A
No Engagement - Reverse   GO to Pinpoint Test B
No Engagement - Both Forward and Reverse   GO to Pinpoint Test C
Engagement Quality - Forward   GO to Pinpoint Test D
Engagement Quality - Reverse   GO to Pinpoint Test E
Engagement Quality - Both Forward and Reverse   GO to Pinpoint Test F
Engagement Quality - Park   GO to Pinpoint Test G
Upshift Quality - Single Gear Affected   GO to Pinpoint Test H
Downshift Quality - Single Gear Affected   GO to Pinpoint Test I
Upshift Quality - Multiple Gears Affected   GO to Pinpoint Test J
Downshift Quality - Multiple Gears Affected   GO to Pinpoint Test J
Torque Converter Clutch Operation   GO to Pinpoint Test K
Fluid Leaking or Overheating   GO to Pinpoint Test L
NVH   GO to Pinpoint Test M
Other Concerns   GO to Pinpoint Test N

Global Customer Symptom Code (GCSC) 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).


Symptom Action
Start/Run/Move > Moving > Engagement Quality > Forward GO to Pinpoint Test D
Start/Run/Move > Moving > Engagement Quality > Reverse GO to Pinpoint Test E
Start/Run/Move > Moving > Engagement Quality > Park GO to Pinpoint Test G
Start/Run/Move > Moving > No Engagement > Both (FWD and REV) GO to Pinpoint Test C
Start/Run/Move > Moving > No Engagement > Forward GO to Pinpoint Test A
Start/Run/Move > Moving > No Engagement > Reverse GO to Pinpoint Test B
Start/Run/Move > Fluids > Transmission > Visible Leak GO to Pinpoint Test L
Start/Run/Move > Fluids > Transmission > Contamination GO to Pinpoint Test L
Start/Run/Move > Noise > Moving/Driving > Always GO to Pinpoint Test M
Start/Run/Move > Noise > Moving/Driving > Intermittent GO to Pinpoint Test M
Start/Run/Move > Vibration > Moving/Driving > Always GO to Pinpoint Test M
Start/Run/Move > Vibration > Moving/Driving > Intermittent GO to Pinpoint Test M

Pinpoint Tests


PINPOINT TEST A: NO ENGAGEMENT - FORWARD

Normal Operation and Fault Conditions

  • No forward
    • Check the A clutch for a does not apply condition.REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the hydraulic SOWC for slipping. REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).

Possible Sources

  • Clutch fault
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST B: NO ENGAGEMENT - REVERSE

Normal Operation and Fault Conditions

  • No reverse
    • Check the B clutch for a does not apply condition. REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the hydraulic SOWC for a does not apply condition. REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check for any other observable symptoms indicating the A, C, E and/or F clutch is stuck on. Resolve those symptoms first.

Possible Sources

  • Clutch fault
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST C: NO ENGAGEMENT - BOTH FORWARD AND REVERSE

Normal Operation and Fault Conditions

  • 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).
    • Collect a transmission fluid sample and inspect it for signs of contamination or wear. REFER to: Preliminary Inspection (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Carry out the line pressure test. If line pressure is low, refer to the Line Pressure Diagnosis Chart for further diagnosis. REFER to: Special Testing Procedures (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Inspect the turbine shaft splines on the transmission input shaft and in the torque converter turbine. INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
    • Inspect the internal transmission components for damage. INSTALL new components as necessary. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).

Possible Sources

  • Low transmission fluid level
  • Low line pressure
  • Clutch fault
  • Damaged turbine shaft splines
  • 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 D: ENGAGEMENT QUALITY - FORWARD

Normal Operation and Fault Conditions

  • 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).
    • Carry out the transmission strategy download and the adaptive learning drive cycle. REFER to: Transmission Strategy Download (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
      REFER to: Adaptive Learning Drive Cycle (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
    • Carry out the line pressure test. If line pressure is low, refer to the Line Pressure Diagnosis Chart for further diagnosis. REFER to: Special Testing Procedures (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the A clutch for a slipping apply condition.REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the hydraulic SOWC for slipping. REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Harsh forward
    • Carry out the transmission strategy download and the adaptive learning drive cycle. REFER to: Transmission Strategy Download (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
      REFER to: Adaptive Learning Drive Cycle (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
    • Check the A clutch for a harsh apply condition. 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).
  • Neutral after launch
    • Check the hydraulic SOWC for slipping. REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Slip on hard acceleration in 1st
    • Check the hydraulic SOWC for slipping. 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

  • Corrupted transmission strategy
  • Low transmission fluid level
  • Low or high line pressure
  • Clutch fault
  • Auto start-stop accumulator fault
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST E: ENGAGEMENT QUALITY - REVERSE

Normal Operation and Fault Conditions

  • 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).
    • Carry out the transmission strategy download and the adaptive learning drive cycle. REFER to: Transmission Strategy Download (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
      REFER to: Adaptive Learning Drive Cycle (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
    • Carry out the line pressure test. If line pressure is low, refer to the Line Pressure Diagnosis Chart for further diagnosis. REFER to: Special Testing Procedures (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the B clutch for a slipping apply condition. REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the hydraulic SOWC for a does not apply condition. REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Harsh reverse
    • Carry out the transmission strategy download and the adaptive learning drive cycle. REFER to: Transmission Strategy Download (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
      REFER to: Adaptive Learning Drive Cycle (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
    • Check the B clutch for a harsh apply condition. 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).

Possible Sources

  • Corrupted transmission strategy
  • Low transmission fluid level
  • Low or high line pressure
  • Clutch fault
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST F: ENGAGEMENT QUALITY - BOTH FORWARD AND REVERSE

Normal Operation and Fault Conditions

  • 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).
    • Collect a transmission fluid sample and inspect it for signs of contamination or wear. REFER to: Preliminary Inspection (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Carry out the transmission strategy download and the adaptive learning drive cycle. REFER to: Transmission Strategy Download (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
      REFER to: Adaptive Learning Drive Cycle (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
    • Carry out the line pressure test. If line pressure is low, refer to the Line Pressure Diagnosis Chart for further diagnosis. REFER to: Special Testing Procedures (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Harsh forward and reverse
    • Carry out the transmission strategy download and the adaptive learning drive cycle. REFER to: Transmission Strategy Download (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
      REFER to: Adaptive Learning Drive Cycle (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
    • Carry out the line pressure test. If line pressure is high, refer to the Line Pressure Diagnosis Chart for further diagnosis. REFER to: Special Testing Procedures (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the A and B clutches for a harsh apply condition. 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).

Possible Sources

  • Corrupted transmission strategy
  • Low transmission fluid level
  • Low or high line pressure
  • Clutch fault
  • 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 G: ENGAGEMENT QUALITY - PARK

Normal Operation and Fault Conditions

  • Unable to shift out of park (vehicles equipped with a selector lever)
    • If the BSIA is not releasing, see condition Brake shift interlock system does not release/lock correctly. REFER to: External Controls (307-05A Automatic Transmission External Controls - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the selector lever cable for correct installation and adjustment and verify the cable is not broken.
    • Check the selector lever mechanism for damage, wear or binding. REPAIR as necessary.
    • Check the transmission manual control lever for damage, wear or binding. REPAIR as necessary. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
    • Inspect the park pawl and the park pawl actuator rod for damage, wear or binding. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
  • Unable to engage park (vehicles equipped with a selector lever)
    • Check the selector lever cable for correct installation and adjustment and verify the cable is not broken.
    • Check the selector lever mechanism for damage, wear or binding. REPAIR as necessary.
    • Check the transmission manual control lever for damage, wear or binding. REPAIR as necessary. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
    • Inspect the park pawl and the park pawl actuator rod for damage, wear or binding. REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
  • Unable to shift out of park (vehicles equipped with a gear shift module)
    • 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).
    • The C or F clutch being hydraulically stuck off can prevent the vehicle from releasing park. Check for other symptoms related to the C and F clutches and resolve those first.
    • Carry out the line pressure test. If line pressure is low, refer to the Line Pressure Diagnosis Chart for further diagnosis.REFER to: Special Testing Procedures (307-01A Automatic Transmission - 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).
    • Disassemble and inspect the park servo valve and bore. If the valve or bore is damaged, INSTALL a new main control valve body. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
    • Inspect the park pawl, park pawl spring and park pawl actuator rod. INSTALL new components as necessary.REFER to: Transmission (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
  • Unable to engage park (vehicles equipped with a gear shift module)
    • 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).
    • The C or F clutch being hydraulically stuck on can prevent the vehicle from engaging park. Check for other symptoms related to the C and F clutches and resolve those first.
    • 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).
    • Disassemble and inspect the park servo valve and bore. If the valve or bore is damaged, INSTALL a new main control valve body. REFER to: Main Control Valve Body (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Overhaul).
    • Inspect the park pawl, park pawl spring and park pawl actuator rod. INSTALL new components as necessary.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 diagnostic trouble codes (DTCs) related to the park lock pawl solenoid.
    • 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).

Possible Sources

  • Park is manually released
  • GSM fault
  • Low line pressure
  • Clutch fault
  • Park servo valve
  • Selector lever
  • Selector lever cable
  • Park pawl, park pawl spring, park pawl actuator rod
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST H: UPSHIFT QUALITY - SINGLE GEAR AFFECTED

Normal Operation and Fault Conditions

  • No 1-2 shift/harsh/soft/slipping
    • Check the F clutch for a does not apply condition. REFER to: F Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the hydraulic SOWC for an always applied or seized condition. REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Description and Operation).
    • Check the A clutch for a slipping apply condition.REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • No 2-3 shift/harsh/soft/slipping
    • Check the C clutch for a does not apply condition. REFER to: C Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the F clutch for an always applied condition. REFER to: F Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the A clutch for a slipping apply condition. REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • No 3-4 shift/harsh/soft/slipping
    • Check the B clutch for a does not apply condition. REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the C clutch for an always applied condition. REFER to: C Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the A clutch for a slipping apply condition. REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • No 4-5 shift/harsh/soft/slipping
    • Check the E clutch for a does not apply condition. REFER to: E Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the B clutch for an always applied condition. REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the A clutch for a slipping apply condition. REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • No 5-6 shift/harsh/soft/slipping
    • Check the B clutch for a does not apply condition. REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the A clutch for an always applied condition. REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the E clutch for a slipping apply condition. REFER to: E Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • No 6-7 shift/harsh/soft/slipping
    • Check the C clutch for a does not apply condition. REFER to: C Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the B clutch for an always applied condition. REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check The E clutch for a slipping apply condition. REFER to: E Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • No 7-8 shift/harsh/soft/slipping
    • Check the F clutch for a does not apply condition. REFER to: F Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the C clutch for an always applied condition. REFER to: C Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the E clutch for a slipping apply condition. REFER to: E Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • No engine braking in M1
    • Check the hydraulic SOWC clutch for a does not apply condition. REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).

Possible Sources

  • Clutch stuck on
  • Clutch stuck off
  • Clutch slipping
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST I: DOWNSHIFT QUALITY - SINGLE GEAR AFFECTED

Normal Operation and Fault Conditions

  • No 8-7 shift/harsh/soft/slipping
    • Check the C clutch for a does not apply condition. REFER to: C Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the F clutch for an always applied condition. REFER to: F Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the E clutch for a slipping apply condition. REFER to: E Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • No 7-6 shift/harsh/soft/slipping
    • Check the B clutch for a does not apply condition. REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the C clutch for an always applied condition. REFER to: C Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check The E clutch for a slipping apply condition. REFER to: E Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • No 6-5 shift/harsh/soft/slipping
    • Check the A clutch for a does not apply condition. REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the B clutch for an always applied condition. REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the E clutch for a slipping apply condition. REFER to: E Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • No 5-4 shift/harsh/soft/slipping
    • Check the B clutches for a does not apply condition. REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the E clutch for an always applied condition. REFER to: E Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the A clutch for a slipping apply condition. REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • No 4-3 shift/harsh/soft/slipping
    • Check the C clutch for a does not apply condition. REFER to: C Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the B clutch for an always applied condition. REFER to: B Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the A clutch for a slipping apply condition. REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • No 3-2 shift/harsh/soft/slipping
    • Check the F clutch for a does not apply condition. REFER to: F Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the C clutch for an always applied condition. REFER to: C Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the A clutch for a slipping apply condition. REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • No 2-1 shift/harsh/soft/slipping
    • Check the electronic SOWC for a does not apply condition. REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Description and Operation).
    • Check the F clutch for an always applied condition. REFER to: F Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Check the A clutch for a slipping apply condition.REFER to: A Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).

Possible Sources

  • Clutch stuck on
  • Clutch stuck off
  • Clutch slipping
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST J: SHIFT QUALITY - MULTIPLE GEARS AFFECTED

Normal Operation and Fault Conditions

  • Only gears 1, 2, 3, 4, 5 available
    • Check the A clutch for an always applied condition. 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 a does not apply condition. 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 an always applied condition. 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 a does not apply condition. 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 an always applied condition. 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 a does not apply condition. 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 an always applied condition. 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 a does not apply condition. 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 an always applied condition. 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 a does not apply condition. 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 an always applied condition. 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 a does not apply condition. REFER to: F Clutch (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • No engine braking in M1
    • Check the hydraulic SOWC for a does not apply condition. REFER to: Hydraulic Selectable One-Way Clutch Assembly (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).

Possible Sources

  • Clutch stuck on
  • Clutch stuck off
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST K: TORQUE CONVERTER CLUTCH OPERATION

Normal Operation and Fault Conditions

  • Torque converter clutch (TCC) does not apply
    • Access the PCM and monitor parameter identifications (PIDs) TCC, TC_SLIPDSD and TC_SLIPACT. Road test the vehicle, making sure TCC lockup is attempted. If the parameter identifications (PIDs) indicate the TCC is slipping when lockup is commanded, check the TCC for a does not apply condition. REFER to: Torque Converter Clutch (TCC) (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Torque converter clutch (TCC) always applied
    • Access the PCM and monitor parameter identifications (PIDs) TCC, TC_SLIPDSD and TC_SLIPACT. Start the engine and select Drive. If the parameter identifications (PIDs) indicate the TCC does not slip and the engine lugs or stalls when Drive is selected, check the TCC for an always applied condition. REFER to: Torque Converter Clutch (TCC) (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Torque converter clutch cycles, shudders, chatters
    • Check the transmission fluid level. REFER to: Transmission Fluid Level Check (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, General Procedures).
    • Access the PCM and monitor parameter identifications (PIDs) TCC, TC_SLIPDSD and TC_SLIPACT. Road test the vehicle, making sure TCC lockup is attempted. If the parameter identifications (PIDs) indicate TCC shuddering, check the TCC for a shuddering condition. 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 (TCC) fault
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST L: FLUID LEAKING OR OVERHEATING

Normal Operation and Fault Conditions

  • External leaks
    • Inspect for leaks. REFER to: Leakage Inspection (307-01A Automatic Transmission - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
  • Overheating
    • Check the transmission fluid cooling system. REFER to: Transmission Cooling (307-02A Transmission Cooling - 8-Speed Automatic Transmission – 8F35/8F40, Diagnosis and Testing).
    • Resolve any TCC concerns.

Possible Sources

  • Transmission seals
  • Transmission cooling system
  • TCC fault
Diagnostic steps are not provided for this symptom or DTC.  REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST M: NOISE, VIBRATION, HARSHNESS

Normal Operation and Fault Conditions

  • Noise
    • Check the engine drive accessories, suspension, CV joints and transmission fluid cooler tubes.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 and 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).

Possible Sources

  • CV Joint
  • Engine drive accessories
  • Suspension
  • Transmission fluid cooler tubes
  • 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 N: OTHER CONCERNS

Normal Operation and Fault Conditions

  • • Assembly gel present in transmission cooler case ports and/or main control assembly on new or low mileage transmissions
    • • A clear gel-like grease is injected into the transmission case cooler ports before the transmission is shipped from the assembly plant. If enough grease is injected, it may be pushed back into the main control. The grease acts as a plug to prevent leaks during transmission installation into the vehicle. Grease found in the cooler ports and/or main control in new transmission assemblies is normal and has no effect on performance. As the transmissions gets up to operating temperature, the grease will melt and dissolve into the transmission fluid.

Possible Sources

  • Normal assembly gel
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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    WARNING: If the tire does not inflate to the recommended tire pressure within 15 minutes, stop and call roadside assistance.

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