Transmission Control Module Replacement (3.8L)

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Transmission Control Module

Courtesy of GENERAL MOTORS CORP.

Callout	Component Name
Fastener Tightening Specifications: Refer to Fastener Tightening Specifications . Preliminary Procedures Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (L26) or Battery Negative Cable Disconnection and Connection (LY7) or Battery Negative Cable Disconnection and Connection (LS4) . Remove the air cleaner housing. Refer to Air Cleaner Assembly Replacement . Position the powertrain control module (PCM) out of the way. Refer to Powertrain Control Module Replacement .
1	Transmission Control Module (TCM) Tip: Disconnect the TCM electrical connector. New TCM must be programmed. Refer to Control Module References for programming and setup information. 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 engine control module (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 Transmission Adaptive Functions .

Callout

Component Name

Fastener Tightening Specifications: Refer to Fastener Tightening Specifications .

Preliminary Procedures

Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (L26) or Battery Negative Cable Disconnection and Connection (LY7) or Battery Negative Cable Disconnection and Connection (LS4) .
Remove the air cleaner housing. Refer to Air Cleaner Assembly Replacement .
Position the powertrain control module (PCM) out of the way. Refer to Powertrain Control Module Replacement .

Transmission Control Module (TCM)
Tip:

Disconnect the TCM electrical connector.
New TCM must be programmed. Refer to Control Module References for programming and setup information.
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 engine control module (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 Transmission Adaptive Functions .