P2E57Exhaust Pressure Sensor C 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
- P2E57 reports a signal from exhaust pressure sensor C above the plausible ceiling. For sensor A Ford sets that ceiling at 4.80 V, on petrol engines checked while the EGR monitor runs and with 5 s to fail, on 2023 diesels with 2 s; in Ford's petrol transfer function 4.7 V already equals about 378 kPa. On a three-wire sensor a high reading usually comes from an open ground, a signal line in contact with the 5 V supply or a battery-fed circuit, or, depending on the input circuit, an open signal line pulled up inside the module. Soot or moisture in the sensing path rarely produce this electrical fault. No manufacturer publicly documents P2E57. After repair, clear the code and confirm that sensor C reads ambient pressure with the engine off. Low is P2E56, sensor A's high code P0473.
- What you may notice
- MIL on
- Boost or EGR control in substitute mode, possibly less power
- Likely causes
- LikelyOpen ground circuit of sensor C
- PossibleSignal wire shorted to the 5 V reference or battery voltage
- PossibleOpen signal wire pulled high by the module input
- RareInternally failed sensor C
- 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.