Transmission Control Module Replacement (LL8)

WARNING: This page is about a different car, the 2008 Isuzu Ascender, 2008 GMC Envoy, and 2008 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of Transmission Control Module, Bracket & Nuts

Courtesy of GENERAL MOTORS CORP.

Callout	Component Name
1	Transmission Control Module (TCM) Procedure: A new TCM requires programming. Refer to Control Module References . Tip: Disconnect the TCM electrical connector. Twisting or tilting of the transmission control module electrical connector while disconnecting may result in bent or misaligned electrical terminal pins. 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), powertrain control module (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 (TCM) .
2	TCM Bracket Nut (Qty: 2) NOTE: Refer to Fastener Notice . Tighten: 6 N.m (53 lb in)
3	TCM Bracket