Powertrain, generic (extended)

P24D1 Particulate Matter Sensor Regeneration Incomplete

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

Before each measurement the particulate matter sensor heats its element to burn off collected soot. P24D1 means that this cleaning phase did not finish properly. Ford's 2023 diesel summary flags the code when the sensor cannot return to measuring after regeneration, judged over 120 s. GM's 18OBDG04 table fails it when the electrode stays at or below 775 °C for 43 s during steady regeneration (25OBDG04A: 715 °C), Type B, and calls it heater degradation. Ford special service message 49846 replaces the sensor on 2017–2019 Super Duty and F-650/750 6.7L trucks, and FCA lists P24D1 for 2019 Jeep Compass diesels in bulletin 18-008-23 (PCM update). P24B7 points to a heater resistance fault, P24AF to an implausible electrode during cleaning.

Likely causes

Sensor heater degraded, not reaching cleaning temperature
Heavy deposits on the sensor element
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

P24B7P24B3P24AFP24AE

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