P009B fault code: what it means

P009B: Diesel fuel pressure relief valve signal circuit problem. PCM limits torque and rail pressure, so the engine feels down on power.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

fuel pressure relief valve (on the common rail) or its connector
wiring shorted to ground or power
PCM

P009B by make

Mazda

Diesel fuel pressure relief valve signal circuit problem. PCM limits torque and rail pressure, so the engine feels down on power.

Usual causes: fuel pressure relief valve (on the common rail) or its connector; wiring shorted to ground or power; PCM

What the repair usually costs

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 P009B 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.