P24C8Particulate Matter Sensor Temperature Circuit Low
- 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
- P24C8 would be set when the temperature signal of the particulate matter sensor sits below its valid range, for example because the meander line is shorted to ground. No manufacturer documents this code publicly; the available summaries fold low and high readings into other codes. Ford's 2023 diesel summary reports any reading under 0.3 V as P24C6, and GM's 25OBDG04A table includes values under 0.3 V in its P24C9 check. CARB requires PM sensor circuits to be checked for out-of-range values, so a low-side code is the logical place for such a fault. Expect a damaged sensor pigtail, a pinched harness or water in the connector. Without a temperature value the heater cannot be regulated and the filter monitor stays inactive. P24C9 is the high counterpart.
- What you may notice
- Malfunction indicator lamp on
- Particulate filter monitor does not complete
- Likely causes
- LikelyTemperature line shorted to ground
- PossibleWater in the sensor connector
- PossibleInternal fault of the sensor element
- 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: €100 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.