P0254 — Injection Pump Fuel Metering Control "A" Low (Cam/Rotor/Injector)
Drivable short-term, but fix now to avoid damage.
What P0254 means
This code means the engine computer detected a lower-than-expected voltage on the 'A' fuel metering control circuit of the diesel injection pump. It commonly points to a short to ground, an open or corroded wire, a failing metering valve, or a connector problem. Repairs usually focus on testing and fixing the circuit wiring and connectors, then replacing the metering valve if needed.
Common symptoms
- Check engine light is on
- Loss of engine power
- Engine stalling or hard starting
- Rough or unstable idle
- Hesitation when accelerating
Common causes
- Wiring shorted to ground
- Open or high-resistance circuit
- Faulty fuel metering control valve
- Corroded or loose connector
- 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 P0254 code?
Only if you have to. A low fuel metering signal can cause stalling or a no-start, so limit driving to getting the car to a shop and have it diagnosed quickly.
How much does it cost to fix a P0254 code?
Costs range from about $150 for a wiring or connector repair to $1,500 or more if the metering valve or injection pump components must be replaced.
Is a P0254 code serious?
Yes. Because it affects fuel delivery, it can leave you with low power or unable to start. It should be addressed promptly rather than ignored.
What usually causes a 'low' reading on this circuit?
A low reading is most often caused by a wire shorted to ground or a high-resistance connection, but a failing metering valve can also be responsible. Testing the circuit pinpoints the cause.