OBD-II code · Powertrain (generic, extended)
P2542 Low Pressure Fuel System Sensor Circuit High
The low-pressure fuel system sensor signal voltage is above the upper limit. Either a short to reference voltage in the signal line, an open signal return, or a sensor reading pegged high after an internal failure. The HP-pump pressure-control strategy falls back to default.
Is it safe to drive with P2542?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal wire shorted to reference voltage
- PossibleOpen signal return
- Less likelyConnector pins corroded - high contact resistance
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- Parts involved
- Lp Fuel Pressure Sensor, Sensor Wiring
Related codes
- P2539Low Pressure Fuel System Sensor Circuit
- P253FEngine Oil Deteriorated
- P2540Low Pressure Fuel System Sensor Circuit
- P2541Low Pressure Fuel System Sensor Circuit Range/Performance
- P2543Power Demand Signal Circuit
- P2544Torque Management Request Input Signal A
- P2545Torque Management Request Input Signal A Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.