GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 623138  Size: SH
  1. Disconnect the vehicle speed sensor (VSS) electrical connector.

  2. Object Number: 623141  Size: SH
  3. Remove the retainer bolt.

  4. Object Number: 12407  Size: SH
  5. Remove the VSS.
  6. Pull up on the VSS in order to remove the VSS.

    Remove the retainer.

  7. Remove the O-ring.

Installation Procedure

  1. Lubricate a new O-ring with DEXRON III transmission fluid.
  2. Install the new O-ring.

  3. Object Number: 12407  Size: SH
  4. Install the VSS retainer.
  5. Install the vehicle speed sensor (VSS) assembly.

    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.


    Object Number: 623141  Size: SH
  6. Install the VSS retainer bolt.
  7. Tighten
    Tighten the bolt to 9 N·m (80 lb in).


    Object Number: 12406  Size: SH
  8. Connect the VSS connector to the VSS.
  9. Lower the vehicle.