Transmission Control Module Replacement

Fig 1: Replacing Transmission Control Module

Courtesy of GENERAL MOTORS CORP.

Callout	Component Name
NOTE: Turn the ignition OFF when installing or removing the control module connectors and disconnecting or reconnecting the power to the control module (battery cable, powertrain control module (PCM)/engine control module (ECM)/transaxle control module (TCM) pigtail, control module fuse, jumper cables, etc.) in order to prevent internal control module damage. Control module damage may result when the metal case contacts battery voltage. DO NOT contact the control module metal case with battery voltage when servicing a control module, using battery booster cables, or when charging the vehicle battery. In order to prevent any possible electrostatic discharge damage to the control module, do no touch the connector pins or the soldered components on the circuit board. Remove any debris from around the control module connector surfaces before servicing the control module. Inspect the control module connector gaskets when diagnosing or replacing the control module. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the control module. The replacement control module must be programmed. Preliminary Procedure: Remove the left sheet metal diagonal brace. Refer to Front End Sheet Metal Diagonal Brace Replacement (Pontiac) or Front End Sheet Metal Diagonal Brace Replacement (Chevrolet)
1	Transmission Control Module (TCM) IMPORTANT: Twisting or tilting of the transmission control module electrical connector while disconnecting may result in bent or misaligned electrical terminal pins. Tip: Disconnect the TCM electrical connector. A new TCM requires programming. Refer to Control Module References . It is recommended that transmission adaptive pressure (TAP) information be reset. Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned. Reset the TAP values. Refer to Control Module References .
2	TCM Bracket Bolt (Qty: 2) NOTE: Refer to Fastener Notice . Tighten:: 10 N.m (89 lb in)
3	TCM Bracket