GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2009 🢒 TrailBlazer - 2WD 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Park/Neutral Position Switch Adjustment

Note: 

   • The following procedure is for vehicles that have not had the switch removed or replaced. If the switch has been removed or replaced, refer to Park/Neutral Position Switch Replacement for the proper adjustment procedure.
   • Apply the parking brake.
   • The engine must start in the P (Park) or N (Neutral) positions only.
   • Check the switch for proper operation. If adjustment is required, proceed as follows:

  1. Place the transmission range selector in the N (Neutral) position.
  2. With an assistant in the drivers seat, raise the vehicle. Refer to Lifting and Jacking the Vehicle.
  3. Loosen the park/neutral position switch mounting bolts.
  4. With the vehicle in the N (Neutral) position, rotate the switch while the assistant attempts to start the engine.
  5. Following a successful start, turn the engine OFF.

    6. Caution: Refer to Fastener Caution in the Preface section.

  6. Tighten the bolts securing the switch to the transmission to 25 N·m (18 lb ft).
  7. Lower the vehicle.
  8. Check the switch for proper operation. The engine must start in the P (Park) or N (Neutral) positions only.
  9. Replace the park/neutral position switch if proper operation can not be achieved. Refer to Park/Neutral Position Switch Replacement.