Powertrain, generic (extended)

P24FD Particulate Filter A Incorrect

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P24FD is intended to flag that the particulate filter in position A is not the expected part or is absent, for example after a filter delete or when an unsuitable replacement has been fitted. No manufacturer documents P24FD publicly. CARB's rules for light and heavy-duty diesels require the OBD system to notice a substrate that is destroyed, removed or swapped for a silencer or plain pipe. Makers usually report that through other codes: Ford's 2023 diesel summary catches a missing substrate as P244A when DPF inlet pressure stays under a flow-dependent limit (about 15 kPa at 600 m³/h) for 90 seconds, and P226D exists for a deteriorated or missing substrate. Expect a lit MIL and a failed emissions inspection until the correct filter is installed.

Likely causes

Particulate filter removed or replaced by a straight pipe
Non-approved or wrong-specification filter fitted
Leaking or blocked pressure lines making a present filter look absent

Symptoms

  • Check engine light
  • Visible soot at the tailpipe if the filter is missing
  • Emissions inspection failed

Repair estimate

DifficultyHardWorkshop job
Parts and labour€400–3,500
Time1–4 h

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

Parts involved

particulate filter a

Related codes

P244AP226DP2002P24FE

References: law.cornell.edu, law.cornell.edu, fordservicecontent.com.