P2CE5Particulate Filter Pressure Sensor C Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- Two manufacturers use P2CE5, with different meanings. In GM's 2025 diesel tables 25OBDG04A and 25OBDG04B, sensor C is the downstream relative pressure sensor that reads gauge pressure behind the particulate filter. Despite the circuit title, GM uses the code as an offset test without exhaust flow: with the engine stopped the reading should be zero, and an offset learned more than 2.20 % away from its nominal value sets a Type B fault without debounce. Ford's 2024–25 petrol summary, which covers particulate filters on both banks, uses P2CE5 for the general circuit fault of a digital SENT sensor C, registered within 5 s; lost communication with it is U0696. A drifted sensor, condensate in the hose or a damaged connector are typical. Regeneration and back pressure monitoring lose a measured input.
- What you may notice
- Warning lamp on, usually after two trips on GM diesels
- Particulate filter regeneration may run less accurately or more often
- Usually no noticeable change in driving
- Likely causes
- LikelySensor C zero point drifted (offset at standstill too large)
- PossibleCondensate or soot in the sensing hose holding pressure
- PossibleDamaged connector or wiring of a digital sensor C
- RareSensor C internally faulty
- 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.