Injection Pump Fuel Metering Control A High (Diesel)
The P0254 code means the vehicle's onboard diagnostic system has detected: Injection Pump Fuel Metering Control A High (Diesel). This is a critical severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- hard
- Estimated cost
- $200 - $800 (parts and labor)
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Common Symptoms
- Check Engine Light illuminated
- Engine starts but runs very rough
- Excessive fuel rail pressure
- Black smoke and possible engine knock
Probable Causes (Ranked by Likelihood)
- Open circuit in fuel metering valve wiring Very High
- Failed fuel metering valve (open coil) High
- Disconnected connector at injection pump Moderate
- PCM driver circuit open Low
Step-by-Step Diagnostic Procedure
-
Measure fuel metering valve resistance. Infinite ohms confirms open coil.
-
Check connector at the injection pump is fully seated.
-
Test wiring continuity from PCM to metering valve.
-
If wiring is good, replace the fuel metering valve.
Frequently Asked Questions
What happens with an open metering valve circuit?
Without control, the metering valve may default to a fully open or closed position, causing either no fuel delivery or maximum uncontrolled fuel delivery.
Can this damage the engine?
Yes, uncontrolled fuel delivery can cause extremely high rail pressures that may damage injectors, fuel lines, or the injection pump itself.
Is the metering valve replaceable separately?
On most diesel engines, yes. The fuel metering control valve is mounted on the injection pump and can be replaced without removing the entire pump.
Sources
This page is built from documented references. Verify against your own service info before repair work.
P0254 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
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