2004 Pontiac GTO StandardFACTORY OEM SERVICE PROCEDURE

Powertrain Control Module (PCM) Replacement: Notes

Powertrain control module (PCM) service should normally consist of either PCM replacement or electrically erasable programmable read only memory (EEPROM) programming. If the diagnostic procedures require PCM replacement, inspect the PCM first to see if the correct part is being used.

IMPORTANT: 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 the following components:
  • A battery cable
  • The PCM pigtail
  • The PCM fuse
  • Jumper cables
IMPORTANT: 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 contamination intrusion into the PCM.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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