P0605 fault code: what it means

P0605: Engine computer internal ROM error. The module failed its self-test; usually needs replacing.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

engine computer internal fault

P0605 by make

Audi

Engine computer internal ROM error. The module failed its self-test; usually needs replacing.

Usual causes: engine computer internal fault

Mercedes-Benz

Engine computer internal fault.

Usual causes: engine computer fault

Nissan

ECM internal memory (ROM) fault. If it comes back after clearing, the manual calls for ECM replacement.

Usual causes: ECM internal fault

Skoda

Engine computer internal ROM error. The module failed its self-test; usually needs replacing.

Usual causes: engine computer internal fault

Volkswagen

Engine computer internal ROM error. The module failed its self-test; usually needs replacing.

Usual causes: engine computer internal fault

Volvo

Engine computer internal fault.

Usual causes: engine computer internal fault

Not sure what P0605 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.