OEM GMC Envoy Engine Control Module

GMC Envoy Engine Control Module Parts Questions & Experts Answers

• PCM
  12678511
  Q: How to service the Engine Control Module (ECM) on GMC Envoy?

  A: The process to service an Engine Control Module begins with determining between replacing or programming the eeprom. Verify that the correct ecm component exists before extracting the faulty unit to replace it with a new service ecm. After installation you must program the new ecm. You must switch off the ignition before attempting to work with control module connectors to avoid harming the inside of the modules. The metal case of the control module must not touch battery voltage and the connector pins together with soldered components should always stay away from human contact to stop electrostatic discharge damage. The technician should check for debris removal from control module connector surfaces while making sure gaskets have the correct installation to block contaminants from entering the system. Notify the technician about the current engine oil life measurement right before disconnecting the negative Battery Cable. Disconnect the engine wiring harness electrical connectors from ecm, also disconnect ecm bracket assembly with ecm bracket nuts and bolts before pulling the assembly from intake manifold studs. Unhook the bracket retainers before taking the ecm out from its position on the bracket. To separate the ecm bracket from the intake manifold studs you must disassemble the bracket bolts and nuts before removing it. During installation process begin by attaching the ecm bracket to intake manifold studs then fasten it with bolts and nuts which should be tightened to 9 nm (80 lb in). After that install the ecm onto the bracket while making sure retainers secure completely. Reinstallation of the ecm to the intake manifold studs requires their placement as instructed during previous procedures. The engine wiring harness electrical connectors need reattachment to the ecm after installing the negative Battery Cable and programming the new ecm. A scan tool should be used to specify remaining engine oil lifetime before completing the installation process.