P24B3 code meaning
Particulate Matter Sensor Heater Control Circuit/Open
Powertrain system Generic code P24xx codes Check engine light
What P24B3 means
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.
P24B3 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 1.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P24B3
- Malfunction indicator lamp on
- Particulate filter monitor does not complete
Common causes of P24B3
- Most likelyHeater element burnt out inside the sensor
- PossibleOpen heater wire or connector
- Less likelyFalse detection in the control software
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Particulate matter sensor heater
What each part of P24B3 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| B3 | The exact fault in that area. |
What to do next
- Note P24B3 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P24B3
What does P24B3 mean?
P24B3 means "Particulate Matter Sensor Heater Control Circuit/Open". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P24B3?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P24B3 fail an emissions test?
Yes, it can. P24B3 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P24B3 to fix?
Difficulty: medium. A typical repair takes 0.5 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P24B3 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.