OEM 2003 GMC Envoy Engine Control Module

2003 GMC Envoy Parts Questions & Experts Answers

• Q: What does the service of the engine control module (ECM) typically involve on 2003 GMC Envoy?

  A: Service of the pcm often requires pcm replacement alongside eeprom programming of the electrically erasable programmable read-only memory. Physical examination should take place to verify that you use the correct pcm component before initiating replacement. After confirmation of the faulty pcm you need to remove it and install the new service pcm. Power transfer to the pcm must be cut off during ignition-free periods when working with battery cables and pcm pigtails as well as pcm fuses and jumper cables. Remove debris from the pcm connector surfaces before making sure gaskets of the pcm module connectors are properly attached to avoid contaminant intrusion. Start the removal by unscrewing the pcm harness connector bolts which are positioned at the center of the harness connectors and proceed to detach the harness connectors from the pcm. Turn off the ignition before removing the mounting nuts and bolts from the pcm along with extracting it from the Intake Manifold. You should take out the pcm mounting studs from the Intake Manifold only if needed. Begin the installation by replacing and torquing mounting studs on the Intake Manifold when needed to 6 n.m (53 lb in). You must install the pcm into the Intake Manifold through the mounting nuts and bolts then tighten them to 10 n.m (88 lb in). The pcm harness connectors need to be installed onto the pcm body while tightening the pcm harness connector retaining bolts to 8 n.m (71 lb in). An installation of a new pcm requires programming through service programming system (SPS) procedures after completion.