GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection.

  2. Object Number: 1998666  Size: SH
  3. Remove the oil cooler inlet (1) and outlet (2) 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. Remove the engine protection shield. Refer to Engine Shield Replacement.
  6. Remove the left engine shield. Refer to Engine Protection Shield Replacement.
  7. Remove the left front fender liner. Refer to Fender Liner Replacement.
  8. Remove the front transmission mount. Refer to Transmission Front Mount Replacement.
  9. Drain the transmission. Refer to Transmission Fluid Replacement.

  10. Object Number: 1999448  Size: SH
  11. Disconnect the control valve body transmission control module (TCM) electrical connector (1).

  12. Object Number: 1999445  Size: SH
  13. Remove the control valve body cover bolts (1).
  14. Support the transmission with a transmission jack.
  15. Using the transmission jack raise the transmission to gain clearance for removal of the control valve body cover.
  16. Remove the control valve body cover.
  17. Remove the control valve body cover gasket.
  18. Caution: Support the control solenoid valve assembly around the connector when removing the seal. Excessive pulling force can damage the internal electrical connections.

  19. Remove the control valve body cover wiring connector hole seal.
  20. 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. Lower the transmission and remove the transmission jack.
  5. Note: Install all the control valve body cover bolts by hand before tightening the bolts in the specified sequence.

  6. Hand start all the control valve body cover bolts (1).
  7. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1999447  Size: SH
  8. Install the control valve body cover bolts and tighten in sequence to 12 N·m (106 lb in).

  9. Object Number: 1999448  Size: SH
  10. Connect the control valve body TCM electrical connector (1).
  11. Install the front transmission mount. Refer to Transmission Front Mount Replacement.
  12. Install the left front fender liner. Refer to Fender Liner Replacement.
  13. Install the left engine shield. Refer to Engine Protection Shield Replacement.
  14. Install the engine protection shield. Refer to Engine Shield Replacement.
  15. Lower the vehicle.

  16. Object Number: 1998666  Size: SH
  17. Install the oil cooler inlet (1) and outlet (5) hoses to the retainer (2) on the control valve body cover.
  18. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection.
  19. Fill the transmission. Refer to Transmission Fluid Replacement.
  20. Check for leaks.