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.
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HOMESERVICE MANUALSCHEVROLET2008SILVERADO 1500 2WD V8-6.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTRANSMISSION POSITION SENSOR/SWITCHADJUSTMENTS
2008 Chevrolet Silverado 1500 2WD V8-6.0L
Transmission Position Sensor/Switch: Adjustments
2008 Chevrolet Silverado 1500 2WD V8-6.0LSECTION Adjustments
Park/Neutral Position Switch Adjustment
Important:
* The following procedure is for vehicles that have not had the park/neutral position (PNP) switch removed or replaced. If the PNP switch has been removed or replaced, refer to Park/Neutral Position Switch Replacement (4L60-E/4L65-E/4L70-E - Automatic Transmission) for the proper adjustment procedure.
* Apply the park brake.
* The engine must start in the park (P) or neutral (N) positions only.
* Check the PNP switch for proper operation. If adjustment is required, proceed as follows:
1. Place the transmission range selector in the neutral (N) position.
2. With an assistant in the drivers seat, raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle .
3. Loosen the park/neutral position (PNP) switch bolts.
4. With the vehicle in the neutral (N) 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 PNP switch bolts.
Tighten the bolts to 25 N.m (18 lb ft).
7. Lower the vehicle.
8. Check the PNP switch for proper operation. The engine must start in the park (P) or neutral (N) positions only.
9. Replace the PNP switch if proper operation can not be achieved. Refer to Park/Neutral Position Switch Replacement (4L60-E/4L65-E/4L70-E - Automatic Transmission) .
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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.