Removal Procedure

Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
Disconnect the cooling fan electrical connector for additional clearance while removing the TCM.

Fig 1: Locating ECM/TCM

Courtesy of GENERAL MOTORS CORP.

Depress the engine control module (ECM)/TCM cover retainers (2).
Remove the ECM/TCM cover from the ECM/TCM bracket (1).

Fig 2: ECM/TCM Connectors & Bracket

Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to Handling ESD Sensitive Parts Notice in Cautions and Notices.

IMPORTANT: It is not necessary to disconnect the TCM electrical connectors in order to remove the TCM from the ECM/TCM bracket. Only disconnect the electrical connectors if servicing of component requires disconnecting of the electrical connectors.

IMPORTANT: Remove any debris from around the TCM connector surfaces before servicing the TCM. Inspect the TCM module connector gaskets when diagnosing or replacing the TCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the TCM.

Disconnect the TCM electrical connector (1) from the TCM (2)

Fig 3: ECM/TCM Retainer

Courtesy of GENERAL MOTORS CORP.

Release the bracket TCM retainer (1).
Tilt the TCM (2) away from the ECM/TCM bracket.

Fig 4: TCM

Courtesy of GENERAL MOTORS CORP.

Remove the TCM (1) from the TCM bracket (2).

Fig 5: ECM/TCM Bracket

Courtesy of GENERAL MOTORS CORP.

Only when replacement of the ECM/TCM bracket (2) is necessary, remove the ECM (3). Refer to Engine Control Module (ECM) Replacement in Engine Controls - 5.3L.

Fig 6: ECM/TCM Bracket Retaining Bolts

Courtesy of GENERAL MOTORS CORP.

Remove the ECM/TCM bracket retaining bolts (2).
Remove the ECM/TCM bracket (1) from the vehicle frame.