P2E55Exhaust Pressure Sensor C Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2E55 is the plausibility test of exhaust pressure sensor C: the voltage is in range, but the pressure does not suit the operating state. CARB wants such rationality faults stored apart from circuit faults. No maker documents P2E55; Ford's 2023 diesel summary shows the pattern for sensor A. With the engine stopped for at least 10 s the reading may differ from ambient pressure by no more than 15 kPa; while driving it is set against a model and may not exceed it by 500 kPa or fall 100 kPa below it. A Ford patent (US7779633) computes the pressure ahead of the turbine; a Bosch patent checks two sensors on either side of a flow restriction against a modelled pressure drop. FCA warns that real back pressure from a clogged particulate filter sets the code on Cummins diesels, so check the exhaust first.
- What you may notice
- MIL, often without noticeable driveability change
- Particulate filter or EGR codes alongside
- Reduced power if the pressure is really too high
- Likely causes
- LikelyReal back pressure from a clogged particulate filter or catalyst
- PossibleSooted or cracked sensing tube to sensor C
- PossibleSensor C offset drifted or stuck mid-range
- RareExhaust leak near the measuring point
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.