P0256Injection Pump Fuel Metering Control B (Cam/Rotor/Injector)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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. Actuator B is a second metering actuator, for example on pumps with two metering valves such as on Saab's 3.0 V6 diesel. P0256 is its general circuit fault, the counterpart of P0251. No manufacturer using P0256 was found – Saab reports its two valves under other codes; the description follows CARB's circuit monitoring requirement and the A siblings.
- What you may notice
- Check engine light on
- Loss of power, limp mode
- Likely causes
- LikelyMetering valve B open
- LikelyConnector or wire to valve B open
- RareEngine module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.