P24B3Particulate Matter Sensor Heater Control Circuit/Open
- 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
- P24B3 means the heater inside the particulate matter sensor cannot draw the current it should while it is switched on, typically because the heater line is open. The heater is needed to burn soot off the electrodes. Ford's 2023 diesel summary checks continuously during sensor regeneration and sets the code when heater current stays below 0.2 A for about 2 s. GM's 18OBDG04 table watches for less than 0.5 A or more than 15 A while heating is requested (Type B); for the 2014 Touareg, VW judges the coil resistance. On 2019 L5P heavy-duty pickups, GM's PIP5607 warns that P24B3 or P24B5 could appear without any hardware fault. Ford's remedy in 18-2225 is a new sensor. P24B5 and P24B6 are the shorts.
- What you may notice
- Malfunction indicator lamp on
- Particulate filter monitor does not complete
- Likely causes
- LikelyHeater element burnt out inside the sensor
- PossibleOpen heater wire or connector
- RareFalse detection in the control software
- 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.