Powertrain, generic (extended)

P24B1 Particulate Matter Sensor Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Condensate on the sensor element making it conductive
Electrode line shorted to a voltage source
Internal sensor fault, replacement sensor needed
Control software needing an update

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

P24B0P24B2P24AEP24AF

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