P2CE6Particulate Filter Pressure Sensor C Circuit Range/Performance
- 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
- P2CE6 marks a sensor C reading that is electrically valid but physically wrong. GM's 2025 diesel tables use it for a frozen downstream relative pressure signal: during transients, with engine speed changing faster than 150 rpm/s and fuel and airflow also changing quickly, the signal must move; too little variation (25OBDG04B: 0.14 % or less in 40 of 50 samples) sets a two-trip Type B code. Ford's 2024–25 petrol filter strategy runs three checks under P2CE6: an offset test after shutdown that fails at an average of 16 to 32 hPa, a rationality test that fails when the reading stays at or above the flow-based expectation for 20 s in total, and a derivative test over 2 s when exhaust flow changes by more than 225 m³/h. Hoses, condensate and drift are more likely than wiring.
- What you may notice
- Warning lamp on
- Particulate filter regenerations triggered too early or too late
- Filter monitoring (missing substrate test) cannot complete
- Likely causes
- LikelySensing hose to sensor C kinked, blocked or disconnected
- PossibleCondensate or frozen water in the sensing line
- PossibleSensor C drifted or sluggish
- 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 · Often possible to do yourself.Typical cost: €20 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.