Powertrain, generic (extended)

P244D Exhaust Temperature Too High For Particulate Filter Regeneration (Bank 1)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

This is the overheating side of the bank 1 regeneration check. While soot is being burned off, the controller keeps exhaust temperature inside a window; if it climbs past the upper limit, the substrate and the oxidation catalyst risk cracking or melting, so the burn is stopped and P244D is logged. GM names it Catalyst Temperature Too High During Regeneration in its 2011 Duramax tables, without publishing a threshold. Ram's 2025 to 2026 heavy-duty Cummins pickups group it with exhaust temperature sensor faults: the bulletin asks for correct battery voltage and for each sensor to be identified by name and position before parts are replaced. Deutz, in contrast, uses P244D for a burn stopped because it was too cold. Too little heat on bank 1 gives P244C, bank 2 has P244F, and general overtemperature is P2428.

Likely causes

Too much fuel reaching the exhaust (leaking injector or aftertreatment doser)
Heavily overloaded filter burning off too fast
Exhaust temperature sensor or its wiring giving implausibly high readings
Control software needing an update

Symptoms

  • Malfunction indicator lamp on
  • Regeneration aborted, filter warning stays on
  • Reduced power to protect the aftertreatment

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–3,000
Time0.5–5 h

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

Parts involved

dpf b1exhaust gas temperature sensor b1

Related codes

P244CP244FP2428P2463P2080

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