GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 12974  Size: SH
  1. Disconnect the CMP sensor harness connector at the sensor.
  2. Remove the CMP sensor bolt (2).
  3. Remove the CMP sensor (1) from the camshaft housing (3).

Installation Procedure

Important: Inspect the CMP sensor O-ring for the following conditions:

   • Wear
   • Cracks
   • Leakage
Replace the CMP sensor O-ring if necessary. Lubricate new O-ring with engine oil before installing.


    Object Number: 12974  Size: SH
  1. Install the CMP sensor (1) into the camshaft housing (3).
  2. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  3. Install the CMP sensor bolt (2).
  4. Tighten
    Tighten the CMP sensor bolt to 15 N·m (11 lb ft).

  5. Connect the CMP sensor harness electrical connector.