P24B0Particulate Matter Sensor 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
- P24B0 flags an electrode signal of the particulate matter sensor that sits too low, typically an open line or a cracked element that no longer conducts as expected. Ford's 2023 diesel summary watches the electrode supply continuously while the sensor measures and sets the code when it drops below 41.55 V for about 1.6 s. In GM's 18OBDG04 table the check runs during sensor regeneration at 600 to 820 °C, compares raw electrode current at two set temperatures and is Type B. VW's 2014 Touareg list ties the code to an electrode current above 5 µA. The code also shows up in FCA bulletin 18-008-23, a PCM update for the 2019 Compass diesel. P24B1 is the high side, P24AE the general electrode fault. Without a working sensor the filter monitor cannot run.
- What you may notice
- Malfunction indicator lamp on
- Particulate filter monitor does not complete
- Likely causes
- LikelySensor element cracked or electrode interrupted
- PossibleOpen electrode line between sensor and sensor control unit
- RareSensor control unit cannot supply the electrode voltage
- 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: €150 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.