P1551 fault code: what it means

P1551: Idle air control valve closing circuit fault.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

faulty idle air control valve
wiring fault

P1551 by make

Land Rover

Idle air control valve closing circuit fault.

Usual causes: faulty idle air control valve; wiring fault

Nissan

Battery current sensor voltage too low. Smart charging control is disabled; charge rate may be wrong.

Usual causes: battery current sensor; wiring open or shorted; sensor power supply circuit

What the repair usually costs

A/C compressor replace incl. drier and flush (European)NZ$1,560–NZ$3,200 · A$1,490–A$3,050

Not sure what P1551 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.