P0254
Injection Pump Fuel Metering Control A High (Cam/Rotor/Injector)
Fuel injection (diesel)
Generic OBD-II
High
What it means
P0254 means the control module sees an abnormally high signal on the 'A' fuel-metering control of the diesel injection pump. This circuit regulates how much fuel the pump delivers, so a fault can leave the engine hard to start, running rough, or down on power — it should be treated as a potential no-start until diagnosed.
High
Can I keep driving? This controls diesel fuel metering, so the engine may run poorly, lose power, or fail to start — treat it as a potential no-start and repair before relying on the vehicle.
Common symptoms
What you'll notice
- Check-engine light on
- Hard starting or a no-start condition
- Rough running or loss of power
- Reduced fuel economy or excessive smoke
Common causes
Most likely first
- Short to voltage in the fuel-metering control 'A' wiring or connectorLikely
- Faulty injection-pump fuel-metering control valve/actuatorCommon
- Low fuel pressure or air in the fuel systemCommon
- Clogged fuel filter starving the pumpLess often
- Faulty injection pumpLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the metering-control wiring and connector for a short to voltage or corrosion.
- Check fuel supply: filter condition, lift-pump pressure, and any air intrusion.
- Test the fuel-metering control valve/actuator resistance and command against spec.
- Verify injection-pump output pressure where the tooling allows.
- Replace the metering control valve or injection pump if confirmed faulty, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0254?+
Not reliably — a diesel metering-control fault can cause poor running or a no-start and may leave you stranded. Repair it promptly.
Can I just clear P0254?+
It will return until the circuit or pump fault is fixed. Clearing does not restore proper fuel metering.
Related codes
Often seen with P0254
Read & clear P0254 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX