GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2008 🢒 Enclave 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 6T70/6T75 🢒 Control Valve Body Cover Replacement

Removal Procedure

  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  2. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .

    3. Object Number: 1831036 Size: SH
  3. Remove the oil cooler inlet hose (1) from the retainer on the control valve body cover.
  4. Remove the oil cooler outlet hose retainer nut (5) from the control valve body cover.
  5. Remove the oil cooler outlet hose (4) from the retainer on the control valve body cover.
  6. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  7. Remove the left engine splash shield. Refer to Engine Splash Shield Replacement .
  8. Drain the transmission. Refer to Transmission Fluid Replacement .

    9. Object Number: 1831034 Size: SH
  9. Remove the wire harness retainer (2) from the control valve body cover stud.
  10. Disconnect the control valve body transmission control module (TCM) electrical connector (1).

    11. Object Number: 1803480 Size: SH
  11. Remove the 2 control valve body cover studs M6 x 30.
  12. Remove the 12 control valve body cover bolts M6 x 30.
  13. Support the transmission with a transmission jack.
  14. Using the transmission jack raise the transmission to gain clearance for removal of the control valve body cover.
  15. Remove the control valve body cover.
  16. Remove the control valve body cover gasket.

    17. Notice: Support the control solenoid valve assembly around the connector when removing the seal. Excessive pulling force can damage the internal electrical connections.

  17. Remove all traces of the old gasket material. Clean the transmission case and control valve body cover gasket surfaces.
  18. Remove the control valve body cover wiring connector hole seal from the TCM.

Installation Procedure


    Object Number: 1803481 Size: SH

    Important: The holes in the control valve body cover wiring connector hole seal must face toward the control solenoid valve assembly. If the holes face toward the valve body cover, there is a potential for a leak around the seal.

  1. Install the control valve body cover wiring connector hole seal.
  2. Install the control valve body cover gasket to the control valve body cover.
  3. Install the control valve body cover.
  4. Lower the transmission and remove the transmission jack.

    5. Notice: Refer to Fastener Notice in the Preface section.

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

  5. Install the 12 control valve body cover bolts (1) M6 x 30.

    6. Tighten
    Tighten the bolts in sequence to 12 N·m (106 lb in).

  6. Install the 2 control valve body cover studs (2) M6 x 30.

    7. Tighten
    Tighten the studs in sequence to 12 N·m (106 lb in).


    Object Number: 1831034 Size: SH
  7. Connect the control valve body TCM electrical connector (1).
  8. Install the wire harness retainer (2) to the control valve body cover stud.

    9. Tighten
    Tighten the nut to 12 N·m (106 lb in).

  9. Install the left engine splash shield. Refer to Engine Splash Shield Replacement .
  10. Lower the vehicle.

    11. Object Number: 1831036 Size: SH
  11. Install the oil cooler outlet hose (4) to the retainer on the control valve body cover.
  12. Install the oil cooler outlet hose retainer nut (5) to the control valve body cover.

    13. Tighten
    Tighten the nut to 12 N·m (106 lb in).

  13. Install the oil cooler inlet hose (1) to the retainer on the control valve body cover.
  14. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  15. Fill the transmission. Refer to Transmission Fluid Replacement .
  16. Check for leaks.