2006 Hummer H3 L5-3.5LFACTORY OEM SERVICE PROCEDURE

Transmission Position Sensor/Switch: Adjustments



Park/Neutral Back Up Switch Adjustment

Important:
^ 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 Back Up 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 and support 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. Notice: Tighten the bolts securing the park/neutral back up switch to the transmission.

^ Tighten the park/neutral back up switch bolts to 27 Nm (20 ft. lbs.).
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.

Factory Service Tools

Use the Manual With the Right Hardware

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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