P24B1Particulate Matter Sensor Circuit High
- 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
- P24B1 reports the electrode side of the particulate matter sensor reading high, which usually points to a short to a voltage source or to a soaked, conductive element. Ford's 2023 diesel summary sets it when electrode current exceeds 41 µA for about 3 s during measurement. GM's 18OBDG04 table looks for an electrode supply reading above 4.1 V in the sensor control unit (30 of 60 samples, Type B), and VW's 2014 Touareg list uses 0 V or more than 4.1 V. Mazda bulletin 01-005-22 for the 2018–2019 CX-5 SKYACTIV-D 2.2 blames condensate on the element and raised detection from one to two drive cycles. Ford 18-2225 replaces the sensor on 2017–2018 Super Duty 6.7L trucks. P24B0 is the low counterpart.
- What you may notice
- Malfunction indicator lamp on
- Particulate filter monitor does not complete
- Likely causes
- LikelyCondensate on the sensor element making it conductive
- PossibleElectrode line shorted to a voltage source
- PossibleInternal sensor fault, replacement sensor needed
- RareControl software needing an update
- 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.