P0607 fault code: what it means

P0607: Control module performance fault: the engine computer failed an internal self-test.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

internal ECM fault
poor ECM power or earth
software needing update

P0607 by make

Mercedes-Benz

Engine computer performance fault.

Usual causes: engine computer fault; low voltage

Nissan

ECM internal processor fault. If it comes back after clearing, the manual calls for ECM replacement.

Usual causes: ECM internal fault

Subaru

On Subaru this is the throttle control system circuit range/performance (ECM throttle control). Poor idle and drivability.

Usual causes: ECM throttle control circuit; electronic throttle body; wiring fault

What the repair usually costs

Alternator replace (small / medium car, petrol)NZ$510–NZ$1,020 · A$480–A$1,000
Alternator replace (SUV / ute / diesel)NZ$750–NZ$1,560 · A$710–A$1,490
Alternator replace (European, smart charging)NZ$930–NZ$2,130 · A$850–A$1,990
Throttle body clean and idle relearnNZ$90–NZ$190 · A$100–A$200

Not sure what P0607 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.