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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 387 (Engine Controls - Removal & Installation - Flex Fuel & Gasoline) >> Computerized Engine Controls >> 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. Ensure ignition is off. Disconnect negative battery cable. Locate PCM at left front corner of engine compartment. See Fig 1. Remove harness ground from the clip attached to the PCM cover (if equipped). If equipped with the Allison transmission, remove the engine harness clip from the PCM cover.
  2. Release PCM cover from mounting tabs on PCM bracket. Remove PCM cover from PCM. Loosen PCM harness connector bolts. See Fig 2. Disconnect PCM harness connectors. Release the PCM spring latch. Remove PCM.
Fig 1: Locating PCM
G00156231Courtesy of GENERAL MOTORS CORP.
Fig 2: Removing/Installing PCM
G00156232Courtesy of GENERAL MOTORS CORP.
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