P24B0 code meaning
Particulate Matter Sensor Circuit Low
Powertrain system Generic code P24xx codes Check engine light
What P24B0 means
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.
P24B0 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 P24B0
- Malfunction indicator lamp on
- Particulate filter monitor does not complete
Common causes of P24B0
- Most likelySensor element cracked or electrode interrupted
- PossibleOpen electrode line between sensor and sensor control unit
- Less likelySensor control unit cannot supply the electrode voltage
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Particulate matter sensor
What each part of P24B0 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). |
| B0 | The exact fault in that area. |
What to do next
- Note P24B0 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 P24B0
What does P24B0 mean?
P24B0 means "Particulate Matter Sensor Circuit Low". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P24B0?
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 P24B0 fail an emissions test?
Yes, it can. P24B0 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 P24B0 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 P24B0 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.