P2CE8Particulate Filter Pressure Sensor C Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2CE8 is the high-side electrical fault of filter pressure sensor C: its output sits above the range a working sensor can produce. GM's 2025 diesel tables aim this test at a broken line or a battery-voltage short and set the code when the raw signal of the downstream relative pressure sensor exceeds 99.80 % in 158 of 200 samples (12.5 ms task), Type B with two trips. On Ford's 2024–25 gasoline particulate filters with analog sensors the limit is 4.73 V for 5 s. An open sensor ground or a signal wire touching the 5 V reference are the usual electrical causes; heat-damaged harness sections near the exhaust deserve a close look. Because a pinned-high value would look like an extremely full filter, the controller ignores it. Low voltage is P2CE7, the D sensor equivalent P2CED.
- What you may notice
- Warning lamp on
- Live data shows sensor C at maximum even at idle
- Regeneration requests may become more frequent
- Likely causes
- LikelySensor ground or signal wire open
- PossibleSignal wire shorted to 5 V reference or battery voltage
- PossibleSensor C internally failed with output stuck high
- 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: €30 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.