Internal Control Module EEPROM Error
This code means the PCM/ECM has detected a fault affecting internal control module eeprom error. In many cases this points to a control-module software problem, an internal module fault, or a power/ground issue that must be verified before a module is replaced.
What You Might Notice
- Check Engine Light illuminated
- No-start or intermittent starting issue
- Reduced performance or fail-safe mode
- Multiple related codes may be stored
- Communication or module-related warning lights
Most Common Causes
- 1
PCM/ECM internal failure
- 2
Programming or calibration problem
- 3
Low battery voltage or poor ground
- 4
Damaged CAN/power/ground wiring
- 5
Aftermarket software or module issue
How to Diagnose It
- 1
Check PCM/ECM internal failure — Inspect for signs of failure and test before replacing.
- 2
Check Programming or calibration problem — Inspect for signs of failure and test before replacing.
- 3
Check Low battery voltage or poor ground — Inspect for signs of failure and test before replacing.
- 4
Check Damaged CAN/power/ground wiring — Inspect for signs of failure and test before replacing.
- 5
Check Aftermarket software or module issue — Inspect for signs of failure and test before replacing.
How to Fix It
- 1
Check battery voltage, charging system, and module grounds
- 2
Inspect power, ground, and network wiring to the control module
- 3
Verify software/calibration status and reflash if applicable
- 4
Replace the failed control module only after circuit checks pass
- 5
Clear the code and retest the system
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