P244DExhaust Temperature Too High For Particulate Filter Regeneration (Bank 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- Malfunction indicator lamp on
- Regeneration aborted, filter warning stays on
- Reduced power to protect the aftertreatment
- Likely causes
- LikelyToo much fuel reaching the exhaust (leaking injector or aftertreatment doser)
- PossibleHeavily overloaded filter burning off too fast
- PossibleExhaust temperature sensor or its wiring giving implausibly high readings
- RareControl software needing an update
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.