P12A4 fault code: what it means

P12A4: High-pressure fuel pump control valve stuck closed. Power loss or stalling.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

faulty pump control valve
high-pressure fuel pump fault
wiring fault

P12A4 by make

Porsche

High-pressure fuel pump control valve stuck closed. Power loss or stalling.

Usual causes: faulty pump control valve; high-pressure fuel pump fault; wiring fault

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
High-pressure fuel pump (GDI petrol or common-rail diesel)NZ$1,140–NZ$4,280 · A$1,060–A$3,800

Not sure what P12A4 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.