P2539Low Pressure Fuel System Sensor Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2539 is the general circuit code of the sensor that reports the supply pressure ahead of the high-pressure pump. In VW's 2014 specification books for the Passat, CC and Touareg it is set once the signal exceeds 4.80 V, which the Passat book attributes to a broken line or contact with the positive supply; below 0.2 V VW stores P2541 instead. Deutz's EMR controller files P2539-F0 for a ground fault of the supply pressure sensor. Ford's 2015 Transit with the 3.2 L Duratorq TDCi has a pressure switch: per SSM 51033, units built from 6 March 2015 may log P2539 in a key-on engine-off self-test because no switch change is seen after shutdown, and the code can be ignored if the engine-running test and the MIL are clean. P2540 to P2543 narrow the fault down. Without the signal, supply pressure control runs on a substitute value.
- What you may notice
- Check engine light
- Hesitation or reduced power under load
- Hard starting, especially after standing
- Likely causes
- LikelySignal or ground wire open, connector not engaged
- PossibleSignal wire shorted to the 5 V reference or battery voltage
- PossibleFailed low-pressure fuel sensor or pressure switch
- RareCode logged only in a static self-test without a real fault (Ford Transit 2015)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.