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 MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 71 (AUTOMATIC TRANSAXLE SERVICING)REMOVAL & INSTALLATIONPARK/NEUTRAL POSITION SWITCHINSTALLATION

2003 Chevrolet TrailBlazer 4.2 S, 4WD

Park/Neutral Position Switch: Installation

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation

WARNING: This page is about a different car, the 2002 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.

Place the shift shaft in the NEUTRAL position. Align the flats of the shift shaft to the flats in the PNP switch.
Install the PNP switch mounting bolts and tighten to specification. See TORQUE SPECIFICATIONS . Connect the switch electrical connectors.

NOTE: Ensure that the engine will only start in the PARK or NEUTRAL positions.

Readjust the switch if the engine will start in any other position. Place the transaxle control shifter assembly in the NEUTRAL position in the detent plate.
Loosen the PNP switch attaching bolts. Rotate the switch on the shifter assembly in order to align the service adjustment hole with the carrier tang hole.
Insert a 3/32" (2.34 mm) maximum diameter gauge pin to a depth of 9/64" (9.0 mm). Tighten the bolts to specification. See TORQUE SPECIFICATIONS .

Fig 1: Locating PNP Switch Connectors

Courtesy of GENERAL MOTORS CORP.

RENDER: 1.0x

NO RELATED

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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.