P1571 fault code: what it means

P1571: Immobiliser reference code incompatibility between immobiliser and ECM. Engine will not start.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

1. ECM or immobiliser unit replaced without registration
2. registration lost

P1571 by make

Not sure what P1571 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.