Envoy 4WD V8-5.3L VIN P (2004)
Engine Control Module: Service and Repair
POWERTRAIN CONTROL MODULE (PCM) REPLACEMENT
Service of the powertrain control module (PCM) should consist of either replacement of the PCM or programming of the electrically erasable
programmable read only memory (EEPROM). If the diagnostic procedures call for the PCM to be replaced, the replacement PCM should be checked to
ensure that the correct part is being used. If the correct part is being used, remove the faulty PCM and install the new service PCM. The replacement
PCM must be programmed.
Removal Procedure
NOTE: Refer to Ignition Switch and PCM Connectors Notice in Service Precautions.
1. Disconnect the negative battery cable.
2. Disconnect the cooling fan electrical connector (1) for additional clearance while removing the PCM.
IMPORTANT: The PCM cover should be flexible enough to hold out of the way while removing the PCM. Remove the PCM cover only if
replacing the cover.
3. Remove the PCM cover retainers.
4. Remove the PCM cover.
