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Home >> GMC >> 2002 >> C3500 HD 8.1 G, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 8.1L >> Repair Instructions >> Powertrain Control Module (PCM) Replacement >> Removal Procedure
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Removal Procedure

NOTE: Refer to PCM & ESD NOTICE in Cautions and Notices.
NOTE: In order to prevent internal damage to the PCM, the ignition must be OFF when disconnecting or reconnecting the PCM connector.
  1. Disconnect the PCM harness connectors (4) from the PCM (1) by loosening the PCM harness connector bolts (3).
  2. Release the PCM retaining clip (2) from the PCM (1).
    Fig 1: PCM, Harness, Retaining Clip & Connector Bolts
    G01599169Courtesy of GENERAL MOTORS CORP.
  3. Slide the PCM (1) out of the PCM mounting bracket (3).
  4. Remove the PCM (1) from the engine compartment.
    Fig 2: PCM & Mounting Bracket
    G01599170Courtesy of GENERAL MOTORS CORP.
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