Powertrain, generic (extended)

P244C Exhaust Temperature Too Low For Particulate Filter Regeneration (Bank 1)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

During an active regeneration the engine raises exhaust temperature with late injections so the soot in the particulate filter can burn. P244C is stored when bank 1 does not get hot enough or does not stay hot long enough. GM's diesel tables of 2017 and 2018 count interrupted regenerations: the burn ran past its maximum time, the post injections were not released in time or the steady heating phase was never reached; a successful burn clears the counter, and the code is Type A after one trip. VW's 2014 TDI cars flag it when closed-loop temperature control upstream of the turbine is not active within 45 s, or ahead of the filter within 60 s. Deutz lists it as a failed regeneration. The bank 2 twin is P244E; P244D covers too much heat. Soot keeps building, so P2463 or P2459 may follow.

Likely causes

Oxidation catalyst aged or face-plugged, so the post-injected fuel does not light off
Regenerations repeatedly cut short by short trips, idling or engine shut-off
Exhaust temperature sensor ahead of catalyst or filter reading too low
Exhaust leak ahead of the catalyst cooling the gas

Symptoms

  • Malfunction indicator lamp and particulate filter warning on
  • Regenerations noticeably frequent or never finishing
  • Reduced power once the filter is heavily loaded

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–1,800
Time0.5–4 h

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

Parts involved

dpf b1exhaust gas temperature sensor b1

Related codes

P244DP244EP2463P2459P2458P2080

References: gsi.ext.gm.com, static.nhtsa.gov, serdia.deutz.com, law.cornell.edu.