P2A21Injection Pump Fuel Metering Control F High (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
- P2A21 marks a high reading in the circuit of the sixth metering element, F. The control module sees battery potential on the line or a current exceeding the driver limit – for instance when the harness rubs through onto a supply wire or the actuator coil is partly short-circuited. A driver stage that protects itself may then switch the output off, so the element can no longer meter at all. No manufacturer publicly documents P2A21. Saab's 2002 V6 diesel shows the consequences of a comparable short in one of its two pump valves: P0259 after 2.1 s, with pedal response limited to 30 % and rail pressure to 60 MPa. The low-side fault of F is P2A20, the functional one P2A1F.
- What you may notice
- Check engine light on
- Severely limited power and throttle response
- Possible stalling
- Likely causes
- LikelyPartly short-circuited coil of metering element F
- PossibleHarness of element F chafed onto a supply wire
- RareDamaged output stage in the engine control 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 – €2,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.