Removal (C3500 HD)
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 GMC C3500 HD, and 2002 Chevrolet RV Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
Remove the negative battery cables. Remove the PCM from the passenger compartment behind the glove box. Remove the connectors from the PCM. Remove the PCM from the mounting bracket.