P228FFuel Pressure Regulator A Exceeded Learning Limits - Too High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P228F is the upper counterpart of P228E: the learned correction for fuel pressure regulator A has run into its maximum. Ford's 2023 diesel summary applies one test to both codes on the 3.0 L and 6.7 L engines, with a limit near a 20 % rail pressure sensor slope error and about 10 s of monitoring at 600 bar or more. In heavy trucks, Volvo and Mack solutions K01029637 and K40914241 group P228F with P0087 and P016F for 11 L and 13 L common-rail engines; one cause they name is a damaged sealing lip on the second-stage filter that lets dirt reach the high-pressure side. Jaguar Land Rover message SSM 74588 lists P228F on the supercharged AJ126 petrol V6 together with high-pressure pump noise. Expect the MIL, possibly with rough running.
- What you may notice
- Check engine light
- Noise from the high-pressure pump
- Uneven running in some cases
- Likely causes
- LikelyDirt in the high-pressure system, e.g. via a leaking fuel filter seal
- PossibleHigh-pressure pump worn or noisy
- PossibleRail pressure sensor characteristic drifted
- RareLow-pressure supply restricted
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.