4L80-E/4L85-E - Automatic Transmission

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 switch has been removed or replaced, refer to Park/Neutral Position Switch Replacement 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 shift lever 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 PNP switch bolts.
4. With the vehicle in neutral (N), rotate the PNP switch while the assistant attempts to start the engine.
5. Following a successful start, turn the engine off.

6. Tighten the PNP switch bolts.
^ Tighten the bolts to 25 Nm (18 ft. lbs.).

Notice: Refer to Fastener Notice in Service Precautions.

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.