P24D1Particulate Matter Sensor Regeneration Incomplete
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- Malfunction indicator lamp on
- Particulate filter monitor does not complete
- Likely causes
- LikelySensor heater degraded, not reaching cleaning temperature
- PossibleHeavy deposits on the sensor element
- RareControl software needing an update
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €150 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.