P244D code meaning
Exhaust Temperature Too High For Particulate Filter Regeneration (Bank 1)
Powertrain system Generic code P24xx codes Check engine light
What P244D means
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.
P244D at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 5 hours
- Clears after repairAfter a drive cycle
Symptoms of P244D
- Malfunction indicator lamp on
- Regeneration aborted, filter warning stays on
- Reduced power to protect the aftertreatment
Common causes of P244D
- Most 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
- Less likelyControl software needing an update
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
DPF b1Exhaust gas temperature sensor b1
What each part of P244D means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 4D | The exact fault in that area. |
What to do next
- Note P244D and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P244D
What does P244D mean?
P244D means "Exhaust Temperature Too High For Particulate Filter Regeneration (Bank 1)". This is the overheating side of the bank 1 regeneration check. It is a generic code, so it means the same on every make.
Is it safe to drive with P244D?
Drive gently and only to a workshop. With P244D the car can go into limp mode (reduced power) to protect itself.
Will P244D fail an emissions test?
Yes, it can. P244D is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P244D to fix?
Difficulty: hard. A typical repair takes 0.5 to 5 hours of work. This is a job for a workshop.
Will P244D clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.