Removal Procedure

WARNING: This page is about a different car, the 2002 GMC C3500 HD and 2002 Chevrolet C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

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.

Disconnect the PCM harness connectors (4) from the PCM (1) by loosening the PCM harness connector bolts (3).
Release the PCM retaining clip (2) from the PCM (1).

Fig 1: PCM, Harness, Retaining Clip & Connector Bolts
Courtesy of GENERAL MOTORS CORP.
Slide the PCM (1) out of the PCM mounting bracket (3).
Remove the PCM (1) from the engine compartment.

Fig 2: PCM & Mounting Bracket
Courtesy of GENERAL MOTORS CORP.