Powertrain, generic (extended)

P24B3 Particulate Matter Sensor Heater Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Heater element burnt out inside the sensor
Open heater wire or connector
False detection in the control software

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 heater

Related codes

P24B4P24B5P24B6P24B7P24D1

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