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.
2012 Chevrolet Express 2500 V8-4.8LFACTORY OEM SERVICE PROCEDURE
Camshaft Position Sensor: Service and Repair
Camshaft Position Sensor Replacement
Removal Procedure
Note:
Clean the area around the camshaft position (CMP) sensor before removal in order to prevent debris from entering the engine.
1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle Service and Repair.
2. Disconnect the engine wiring harness electrical connector (1) from the CMP sensor wire harness.
3. Remove the 3 CMP sensor wire harness bolts (738).
4. Disconnect the CMP sensor wire harness electrical connectors from the CMP sensor and the CMP actuator magnet.
5. Remove the CMP sensor wire harness (737).
6. Remove the CMP sensor (703) and O-ring seal (704).
Installation Procedure
1. Inspect the CMP O-ring seal for cuts or damage. If the seal is not cut or damaged, it may be used again.
2. Lubricate the O-ring seal with clean engine oil.
3. Install the O-ring seal (704) onto the sensor.
4. Instal the CMP sensor (703) to the front cover.
5. Install the CMP sensor wire harness (737).
6. Connect the CMP sensor wire harness electrical connectors to the CMP sensor and the CMP actuator magnet.
Caution:
Refer to Fastener Caution Fastener Caution.
7. Install the 3 CMP sensor wire harness bolts (738).
Tighten the bolts to 12 Nm (106 lb in).
8. Connect the engine wiring harness electrical connector (1) to the CMP sensor wire harness.
9. Lower the vehicle.
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.