Internal Control Module Read Only Memory (ROM) Error
Each control unit monitors itself and checks its memory every time it runs.
What the car has detected
The control unit has failed its own internal test of the memory that holds its program.
A control unit with damaged memory can make the engine stall or run badly. Have it checked as soon as possible and avoid long trips until then.
Symptoms
- Engine warning light on
- The engine stalls or runs badly
Possible causes
- Internal control unit fault
- Interrupted or botched remap
- Poor ECU power supply or earth
Checks for the garage
- Check the battery and charging voltage
- Check the engine computer's supply and earth points
Next step
Ask for the unit’s power supply and earths to be checked. If it persists, it is repaired by a specialist or replaced and coded.
Go to a garage as soon as possible. If the car stalls while driving, stop in a safe place and call for assistance.