P0257
Injection Pump Fuel Metering Control B Range/Performance (Cam/Rotor/Injector)
Injection Pump Fuel Metering Control B Range/Performance (Cam/Rotor/Injector): the signal is implausible or outside the valid range. This affects fueling of the associated cylinders.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Actuator B driftedCommon
- Sensor element aged beyond calibration windowLess likely
- Sensor mounting loose - signal dampingLess likely
Parts involved
- Metering Actuator B
P0257 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.