K 3500 Truck 4WD V8-6.0L VIN U (2002)
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 electrically erasable programmable read only
memory (EEPROM) programming. If 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.
IMPORTANT: To prevent internal PCM damage, the ignition must be OFF when disconnecting or reconnecting power to the PCM. For example,
when working with a battery cable, PCM pigtail, PCM fuse, or jumper cables.
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Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM module connector gaskets when diagnosing or
replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the PCM.
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The replacement PCM must be programmed.
Removal Procedure
1. Disconnect the negative battery cable.
2. If equipped with regular production option (RPO) NYS, remove the harness ground from the clip attached to the PCM cover.
3. Release the PCM cover from the mounting tabs on the PCM bracket.
4. Remove the PCM cover.
NOTE: Refer to PCM and ESD Notice in Service Precautions.
5. Loosen the PCM harness connector bolts (2).
6. Disconnect the PCM harness connectors.
