GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Remove the battery tray. Refer to Battery Tray Replacement.

  2. Object Number: 1998666  Size: SH
  3. Remove the oil cooler inlet (1) and outlet (5) hoses from the retainer (2) on the control valve body cover.
  4. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
  5. Drain the transmission. Refer to Transmission Fluid Replacement.

  6. Object Number: 1999448  Size: SH
  7. Disconnect the control valve body transmission control module (TCM) electrical connector (1), then the wiring harness from the cover.

  8. Object Number: 1999445  Size: SH
  9. Remove the control valve body cover bolts (1).
  10. Remove the control valve body cover.
  11. Remove the control valve body cover gasket.
  12. Caution: Support the control solenoid valve assembly around the connector when removing the seal. Excessive pulling force can damage the internal electrical connections.

  13. Remove the control valve body cover wiring connector hole seal.
  14. Remove all traces of the old gasket material. Clean the transmission case and control valve body cover gasket surfaces.

Installation Procedure


    Object Number: 1999445  Size: SH
  1. Install the control valve body cover wiring connector hole seal (4).
  2. Install the control valve body cover gasket (3) to the control valve body cover.
  3. Install the control valve body cover (2).
  4. Hand start the control valve body cover bolts (1).
  5. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1999447  Size: SH

    Note: Install all control valve body cover bolts and studs by hand then torque all bolts and studs in sequence.

  6. Install the control valve body cover bolts. Tighten the bolts in sequence to 12 N·m(106 lb in).

  7. Object Number: 1999448  Size: SH
  8. Connect the control valve body transmission control module (TCM) electrical connector (1), then clip the wiring harness to the cover.
  9. Lower the vehicle.

  10. Object Number: 1998666  Size: SH
  11. Install the oil cooler inlet (1) and outlet (5) hoses to the retainer (2) on the control valve body cover.
  12. Fill the transmission. Refer to Transmission Fluid Replacement.
  13. Check for leaks.
  14. Install the battery tray. Refer to Battery Tray Replacement.