Powertrain, generic · Fuel and air metering (injector circuit)
P0255 Injection Pump Fuel Metering Control A Intermittent (Cam/Rotor/Injector)
Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible
These codes cover the electrically controlled fuel metering actuator on a diesel injection pump – on common rail usually an inlet metering valve on the high-pressure pump that sets how much fuel is compressed. P0255 reports brief open or short circuits in the actuator A circuit that come and go – typically a loose contact or a wire breaking under vibration. No manufacturer using it with exactly this meaning was found; a Ram 6.7 Cummins code list names it as a circuit performance fault instead. The description follows CARB's continuous circuit monitoring requirement and the documented A siblings.
Likely causes
Loose contact or corrosion at the metering actuator connector
Harness chafing intermittently (vibration)
Actuator coil with a temperature-dependent fault
Engine module
Symptoms
- Check engine light (often goes out again)
- Brief jerking or power dips
- Occasional limp mode
Repair estimate
DifficultyMediumWorkshop job
Parts and labour€50–1,200
Time0.5–4 h
Typical range across vehicles; the real cost depends on what the testing finds.
Parts involved
fuel metering actuator ahigh pressure fuel pumpactuator wiring
Related codes
References: law.cornell.edu, saabwisonline.com.