Powertrain, generic (extended)

P243D Particulate Filter Regeneration Duration (Bank 2)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P243D says that a regeneration of the bank 2 particulate filter took longer than the calibrated limit. CARB expects the OBD system to notice when a filter fails to regenerate properly under conditions in which it was designed to. No manufacturer publishes this bank 2 code; the bank 1 version P2458 shows what such a limit looks like, for example on VW's 2014 Touareg TDI, where an accumulated regeneration timer above 93.35 min counts as a fault. Low exhaust temperature on that bank, a weak oxidation catalyst, an incorrect temperature or pressure signal and many short trips all drag the process out. A long regeneration costs fuel and puts extra heat into the filter. P243C covers regenerations that come too often, P243E those that end with soot left in the filter.

Likely causes

Exhaust on bank 2 not reaching regeneration temperature (short trips, low load)
Oxidation catalyst on bank 2 converting too little fuel into heat
Temperature or pressure sensor giving wrong values

Symptoms

  • Regeneration seems to run for a very long time (fan, idle speed)
  • Higher fuel consumption
  • MIL on

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

P2458P243CP243E

References: law.cornell.edu, static.nhtsa.gov.