2005 Cadillac XLRFACTORY OEM SERVICE PROCEDURE

Engine Control Module (ECM) Replacement: Notes

Engine control module (ECM) service should normally consist of either ECM replacement or EEPROM programming. If the diagnostic procedures require ECM replacement, check the ECM first to see if the correct part is being used.

IMPORTANT: In order to prevent internal ECM damage, the ignition must be OFF when you disconnect or reconnect the power to the ECM. For example, disconnect the power when you work with the following components:
  • A battery cable
  • The ECM pigtail
  • The ECM fuse
  • The jumper cables
IMPORTANT: When you diagnose or replace the ECM, remove any debris from the ECM connector surfaces before servicing the ECM module connector gaskets. Ensure that the gaskets are installed correctly. The gaskets prevent intrusion into the ECM.
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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