Powertrain, generic (extended)

P24B0 Particulate Matter Sensor Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Sensor element cracked or electrode interrupted
Open electrode line between sensor and sensor control unit
Sensor control unit cannot supply the electrode voltage

Symptoms

  • Malfunction indicator lamp on
  • Particulate filter monitor does not complete

Repair estimate

DifficultyMediumDIY possible
Parts and labour€150–700
Time0.5–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

particulate matter sensor

Related codes

P24B1P24B2P24AEP24AFP24D0

References: fordservicecontent.com, gsi.ext.gm.com, static.nhtsa.gov, static.nhtsa.gov.