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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 208 (Automatic Transmission - ALLISON - Diagnosis) >> Removal & Installation >> Powertrain Control Module >> Removal

Powertrain Control Module: Removal

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the negative battery cable.
  2. Remove the engine harness clip from the PCM cover.
  3. Release the PCM cover mounting tabs. See Fig 1.
  4. Release the PCM cover from the mounting bracket.
  5. Remove the PCM cover.
  6. Loosen the PCM electrical connector bolts (2). See Fig 2.
    CAUTION: Do not touch the connector pins or soldered components on the circuit board in order to prevent possible electrostatic discharge (ESD) damage to the PCM.
    NOTE: In order to prevent internal damage to the PCM, the ignition must be OFF when disconnecting or reconnecting the PCM connector.
  7. Disconnect the PCM electrical connectors.
  8. Release the spring latch from the PCM. See Fig 3.
  9. Release the PCM mounting tabs from the PCM.
  10. Remove the PCM.
Fig 1: Removing PCM Cover
G00178459Courtesy of GENERAL MOTORS CORP.
Fig 2: Loosening PCM Electrical Connector Bolts
G00178460Courtesy of GENERAL MOTORS CORP.
Fig 3: Removing PCM
G00178461Courtesy of GENERAL MOTORS CORP.
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