P2542Low Pressure Fuel System Sensor Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2542 means the low-pressure fuel sensor reports a voltage above its permitted range. Deutz is explicit: its MD1 controller stores P2542 when the supply pressure sensor signal rises beyond its normal voltage or is shorted toward the high side (SPN 94, FMI 3), and the EMR system describes P2542-00 as a battery short. P2542 also appears in the list Ford published for the BOSS 302S engine module of 2014. VW, by contrast, does not use P2542 in its 2014 books for the Passat, CC and Touareg and files a signal above 4.80 V as P2539. Besides a short to the 5 V reference or battery voltage, a broken sensor ground can lift the signal. A falsely high reading can mask a real lack of supply pressure, so the engine may lose power without an obvious reason. P2541 is the low-side counterpart, P2540 the plausibility fault, P2543 short dropouts.
- What you may notice
- Check engine light
- Reduced power or stalling if real pressure is low
- Hard starting
- Likely causes
- LikelySignal wire shorted to the 5 V reference or battery voltage
- PossibleSensor ground wire or pin interrupted
- PossibleFailed low-pressure fuel sensor with high output
- 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.