Powertrain, generic (extended)

P243E Particulate Filter Regeneration Incomplete (Bank 2)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P243E is set when the second filter strand has finished regenerating but the soot was not burned off as planned. CARB requires a malfunction to be flagged whenever the filter does not regenerate properly under the manufacturer's intended conditions. Public manufacturer material covers only bank 1 here: for P24A2, Ford's 2023 diesels evaluate each regeneration, allow up to 40 minutes and store a fault if the soot estimate at the end is still above a threshold. Regenerations cut short by brief trips or switching off are the usual reason, followed by too little heat on that bank, a faulty temperature or pressure sensor or a fuel dosing problem. Ignored, the filter keeps loading until P243F or a power limit follows.

Likely causes

Regenerations interrupted by short trips or engine shut-off
Too little heat on bank 2 (catalyst, post-injection or dosing fault)
Faulty temperature or differential pressure signal

Symptoms

  • MIL on, filter warning
  • Regeneration restarts soon after the last one
  • Rising soot load in live data

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–1,500
Time0.5–3 h

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

Parts involved

dpf b2

Related codes

P24A2P243DP243CP243F

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