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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 219 (AUTOMATIC TRANSMISSION SERVICING)ADJUSTMENTSPARK/NEUTRAL POSITION SWITCH
1999 GMC Forward Control 5.7 R, Automatic
Park/Neutral Position Switch
1999 GMC Forward Control 5.7 R, AutomaticSECTION Park/Neutral Position Switch
WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
The following procedure is for vehicles that have not had the switch removed or replaced. If the switch has been removed or replaced, see PARK/NEUTRAL POSITION SWITCH under REMOVAL & INSTALLATION. Apply the parking brake. The engine must start in the Park or Neutral positions only. Check the switch for proper operation. If adjustment is required, proceed as follows:
- The transmission must be in the Neutral position only.
- With an assistant in driver's seat, raise and support vehicle.
- Loosen the switch retaining bolts and rotate the switch slightly, while the assistant attempts to start engine.
- After engine starts, turn engine off.
- Tighten PNP switch bolts to specification. See TORQUE SPECIFICATIONS .
- Lower the vehicle.
- Ensure vehicle does not start in any range other than Park and Neutral.
- Replace the PNP switch if proper operation can not be achieved.
RENDER: 1.0x
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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.