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Emergency
FAULT CODE READING

OBD2 codes.

A code identifies a signal or system that needs to be checked, not a part you should replace.

Got an OBD2 Bluetooth adapter? Read the codes straight from your car.

1 code entry · 0 related faults

P0605Control module program memory errorUrgency high

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.

Original sources · Date indicated: 2026-10-29

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