Powertrain Control Module: Notes

WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Powertrain Control Module (PCM) service should normally consist of either PCM replacement or EEPROM programming. If the diagnostic procedures require PCM replacement, check the PCM first to see if the correct part is being used. In order to prevent internal PCM damage, the ignition must be OFF when you disconnect or reconnect the power to the PCM. For example, disconnect the power when you work with a battery cable, PCM pigtail, PCM fuse or jumper cables. When you diagnose or replace the PCM, remove any debris from the PCM connector surfaces before servicing the PCM module connector gaskets. Ensure that the gaskets are installed correctly. The gaskets prevent intrusion into the PCM. The replacement PCM MUST be programmed.