P0255 — Injection Pump Fuel Metering Control "A" High (Cam/Rotor/Injector)
Drivable short-term, but fix now to avoid damage.
What P0255 means
This code means the engine computer detected a higher-than-expected voltage on the 'A' fuel metering control circuit of the diesel injection pump. It commonly points to a wire shorted to power, a faulty metering valve, or a corroded connector creating an abnormal signal. Repairs usually involve testing and fixing the wiring and connectors, then replacing the metering valve if it has failed.
Common symptoms
- Check engine light is on
- Loss of engine power
- Rough idle or stalling
- Hesitation or surging during acceleration
- Hard starting
Common causes
- Wiring shorted to power (battery voltage)
- Faulty fuel metering control valve
- Corroded or damaged connector
- Open circuit in the control wiring
- Failing engine control module (rare)
Typical repair cost
$150 – $1500
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0255 code?
Only short distances if needed. A high metering signal can cause stalling or power loss, so it's safest to drive only to a shop and have it checked soon.
How much does it cost to fix a P0255 code?
Repairs range from around $150 for wiring or connector fixes to $1,500 or more if the metering valve or pump components need replacement.
Is a P0255 code serious?
Yes. It affects how much fuel reaches the engine, so it can cause poor performance or a no-start. It's best handled promptly rather than left to worsen.
What usually causes a 'high' reading on this circuit?
A high reading is most often caused by a wire shorted to power or a corroded connector, though a failing metering valve can also trigger it. Circuit testing confirms the real cause.