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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 999 (Automatic Transmission - ALLISON (Introduction, Service & Replacement)) >> Repair Instructions >> Transmission Control Module (TCM) Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
  • Remove any debris from the transmission control module (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.
  • The ignition must be OFF when disconnecting or reconnecting power to the TCM.
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure (Single Battery)Battery Negative Cable Disconnect/Connect Procedure (Auxiliary Battery) in Engine Electrical.
  2. Remove the TCM cover bolts (1) located on the left side of the radiator shroud.
    Fig 1: Removing The Tcm Cover Bolts
    GM711679Courtesy of GENERAL MOTORS CORP.
  3. Pull the cover and TCM up and away from the radiator shroud.
    4. Fig 2: Removing The TCM From The Vehicle
    GM711689Courtesy of GENERAL MOTORS CORP.
  4. Push up on the retainers (1) in order to remove the TCM from the cover.
  5. Disconnect the TCM electrical connectors (2) and remove the TCM from the vehicle.
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