Powertrain, generic (extended)

P24A2 Particulate Filter Regeneration Incomplete (Bank 1)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P24A2 judges the outcome of a regeneration on the bank 1 filter: the event ended, but the estimated soot left in the filter is still above the allowed level. Ford's 2023 diesel summary runs this once per regeneration for up to 40 minutes and compares the soot estimate at the end with a threshold. Deutz uses P24A2-00 for a regeneration stopped because the temperature got too high, and Hino bulletin SB-22-007 lists it together with P24A1 for a fuel filter issue on 2020 trucks. CARB demands detection of a filter that does not regenerate properly. Too low or too high exhaust temperatures, aborted regenerations and pressure sensor errors are common reasons. P243E is the bank 2 version; P24A4 follows if soot keeps rising.

Likely causes

Regenerations interrupted by short trips or engine shut-off
Exhaust temperature not reaching target (doser, oxidation catalyst, sensors)
Differential pressure sensor or its hoses giving a wrong soot estimate
Regeneration stopped by over-temperature protection

Symptoms

  • Malfunction indicator lamp or filter warning on
  • More frequent regenerations, higher fuel consumption
  • Reduced power if soot keeps building

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–1,200
Time0.5–3 h

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

Parts involved

dpf b1

Related codes

P243EP24A4P2463P2459P24A0

References: fordservicecontent.com, serdia.deutz.com, static.nhtsa.gov, law.cornell.edu.