P2A1B
Injection Pump Fuel Metering Control E Range/Performance (Cam/Rotor/Injector)
Fuel metering on channel E of the injection pump is outside the calibrated tolerance. Mechanical wear or pressure regulator drift.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Internal wear in pump elementCommon
- Pressure regulator driftPossible
- Sensor element aged beyond calibration windowLess likely
Parts involved
- Injection Pump Metering E
- Injection Pump
- Wiring Harness
P2A1B 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.