Removal Procedure

Remove the battery tray. Refer to Battery Tray Replacement .
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
Remove the left front wheelhouse liner. Refer to Front Wheelhouse Liner Replacement .
Remove the fluid level drain plug (1).

Fig 1: Identifying Fluid Level Hole Plug
Courtesy of GENERAL MOTORS COMPANY
Drain transmission fluid into a suitable container.
Lower the vehicle.
Remove the transmission fluid cooler inlet and outlet pipe. Refer to Transmission Fluid Cooler Inlet and Outlet Pipe Replacement .
Plug and/or cap the pipes and transmission to prevent contamination.
Disconnect the electrical connector (1) transmission control module (TCM), then unclip the connector from the transmission.

Fig 2: Identifying Control Valve Body Transmission Control Module (TCM) Electrical Connector
Courtesy of GENERAL MOTORS COMPANY
Remove the wiring harness starter motor from the transmission. Remove the bolt from the retainer on the valve body cover. Unclip the wiring harness from the retainer on the valve body cover and the range selector cable bracket.
Remove the 13 control valve body cover bolts (1).

Fig 3: View Of Control Valve Body
Courtesy of GENERAL MOTORS COMPANY
Remove the control valve body cover (2).
Remove and DISCARD the control valve body cover gasket (3).
Remove and DISCARD the control valve body cover wiring connector hole seal (4).
CAUTION: Support the control solenoid valve assembly around the connector when removing the seal. Excessive pulling force can damage the internal electrical connections.
Remove all traces of the old gasket material. Clean the transmission case and control valve body cover gasket surfaces.