Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2007 Hummer H3 L5-3.7LFACTORY OEM SERVICE PROCEDURE
Transmission Position Sensor/Switch: Adjustments
Park/Neutral Backup 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 Backup 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. refer to vehicle lifting.
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.
Notice: Refer to Fastener Notice.
6. Tighten the bolts securing the park/neutral back up switch to the transmission.
Tighten the park/neutral back up switch bolts to 27 N.m (20 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.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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