P1615 fault code: what it means

P1615: Key ID not recognised (difference of key): an unregistered key was used. Engine will not start with that key.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

unregistered or wrong key
key fob battery flat
key not registered after replacement

P1615 by make

Nissan

Key ID not recognised (difference of key): an unregistered key was used. Engine will not start with that key.

Usual causes: unregistered or wrong key; key fob battery flat; key not registered after replacement

Suzuki

Steering lock communication malfunction (keyless start models). Engine may not start; steering may stay locked.

Usual causes: steering lock unit; wiring fault; keyless start control module

What the repair usually costs

Spare key / remote supply, cut and program (transponder or flip key, sublet locksmith)NZ$190–NZ$600 · A$190–A$540
Smart / proximity key supply and program (push-button start, sublet locksmith)NZ$430–NZ$960 · A$320–A$760
Smart key supply and program (European, sublet locksmith or dealer)NZ$580–NZ$1,540 · A$550–A$1,480
Engine replacement, used import engine (4-cylinder)NZ$2,550–NZ$6,690 · A$2,440–A$6,250

Not sure what P1615 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.