Injection Pump Fuel Metering Control A High (Cam/Rotor/Injector)
P0254 indicates the engine control module detected an abnormally high signal from the fuel injection pump metering control circuit. This code typically affects diesel engines and suggests the fuel delivery system is not operating within expected parameters, potentially causing improper fuel injection timing or quantity.
What You Might Notice
- Check engine light illumination
- Decreased fuel economy
- Rough idle or hesitation during acceleration
- Reduced engine power or performance
- Possible white or black smoke from exhaust
Most Common Causes
- 1
Failed Fuel Rail Pressure (FRP) Sensor
The FRP sensor provides feedback on fuel pressure to the injection pump control circuit. A faulty sensor will send incorrect signals causing the high metering control reading.
- 2
Short to Power in FRP Sensor Signal Circuit
An electrical short in the wiring harness or connector feeding the FRP sensor can cause voltage spikes that register as abnormally high readings to the PCM.
- 3
Open or Poor Ground at FRP Sensor
A loose, corroded, or broken ground connection at the FRP sensor will cause unstable signal readings and trigger the high circuit fault code.
- 4
Faulty Fuel Injection Pump Control Module
Though less common, the fuel pump control circuit itself or injection pump solenoid may malfunction, resulting in improper metering signal feedback to the PCM.
How to Diagnose It
- 1
Check Failed Fuel Rail Pressure (FRP) Sensor — The FRP sensor provides feedback on fuel pressure to the injection pump control circuit. A faulty sensor will send incorrect signals causing the high metering control reading.
- 2
Check Short to Power in FRP Sensor Signal Circuit — An electrical short in the wiring harness or connector feeding the FRP sensor can cause voltage spikes that register as abnormally high readings to the PCM.
- 3
Check Open or Poor Ground at FRP Sensor — A loose, corroded, or broken ground connection at the FRP sensor will cause unstable signal readings and trigger the high circuit fault code.
- 4
Check Faulty Fuel Injection Pump Control Module — Though less common, the fuel pump control circuit itself or injection pump solenoid may malfunction, resulting in improper metering signal feedback to the PCM.
How to Fix It
- 1
Inspect and Replace FRP Sensor
Locate the fuel rail pressure sensor on the fuel rail or injection pump. Check for physical damage, corrosion, or leaking. Test sensor voltage output with a multimeter; if readings are erratic or out of specification, replace the sensor with an OEM or quality equivalent.
- 2
Check and Repair Sensor Wiring and Connectors
Inspect the entire wiring harness from the FRP sensor to the PCM for pinched, melted, or corroded wires. Check connectors for corrosion, loose pins, or bent terminals. Repair or replace damaged sections and ensure all connections are tight and secure.
- 3
Test and Repair Ground Circuits
Use a multimeter to verify proper ground continuity at the FRP sensor ground connection. Clean any corrosion, tighten loose fasteners, and verify the ground path to the engine block or chassis has low resistance. Replace ground straps if corroded or damaged.
- 4
Check Technical Service Bulletins and Reprogram PCM
Consult manufacturer TSBs for known issues with your specific vehicle year and model. If all sensors and circuits test normal, the PCM may require reprogramming or replacement. This should be performed by a qualified diesel technician.
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