Pinpoint Test G: Engagement Quality - Park

• 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 .
  • Check the selector lever cable for correct installation and adjustment and verify the cable is not broken. REFER to: Selector Lever Cable .
  • Check the selector lever mechanism for damage, wear or binding. REPAIR as necessary. REFER to: Selector Lever Assembly .
  • Check the transmission manual control lever for damage, wear or binding. REPAIR as necessary. REFER to: Transmission .
  • Inspect the park pawl and the park pawl actuator rod for damage, wear or binding. REFER to: Transmission .

• 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. REFER to: Selector Lever Cable .
  • Check the selector lever mechanism for damage, wear or binding. REPAIR as necessary. REFER to: Selector Lever Assembly .
  • Check the transmission manual control lever for damage, wear or binding. REPAIR as necessary. REFER to: Transmission .
  • Inspect the park pawl and the park pawl actuator rod for damage, wear or binding. REFER to: Transmission .

• Unable to shift out of park (vehicles equipped with a gear shift module) 
  • Resolve all GSM diagnostic trouble codes (DTCs). REFER to: External Controls .
  • 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 .
  • Check the park lock pawl solenoid pin for being stuck extended. REFER to:Main Control Valve Body  .
  • 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 .
  • Inspect the park pawl, park pawl spring and park pawl actuator rod. INSTALL new components as necessary. REFER to: Transmission .

• Unable to engage park (vehicles equipped with a gear shift module) 
  • Verify park is not manually released.
  • Resolve all GSM diagnostic trouble codes (DTCs). REFER to: External Controls .
  • 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 .
  • 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 .
  • Inspect the park pawl, park pawl spring and park pawl actuator rod. INSTALL new components as necessary. REFER to: Transmission .

• 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 .

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