Diagnostic article Generic OBD-II
P244C: Regeneration temperature falls short of a changing target
Learn how P244C compares temperature before the particulate filter with a fuel-and-speed-dependent regeneration target.
Read before applying this article
Documented application
GM 2009 09OBDG01 Duramax Engine Diagnostics, only the cited ECM monitor. This historical calibration does not establish applicability to every Duramax vehicle or provide a complete service procedure.
The code alone does not identify a failed part or establish that a vehicle is safe to drive. Confirm the vehicle, reporting module and applicable service procedure.
P244C means the exhaust did not reach the expected temperature during particulate-filter regeneration in the cited Duramax monitor. The controller uses the exhaust temperature sensor before the DPF and compares its reading with a target determined by fueling and engine speed.
A shortfall, not one universal minimum
The listed failure is more than 100°C below that target for five minutes while active DPF regeneration is commanded. The 100°C figure is a temperature difference, not an absolute exhaust-temperature threshold. A single reading cannot be judged correctly without the target and active-regeneration state that accompanied it.
That distinction also separates P244C from a soot-loading conclusion. On the same source page, P2463 uses a modeled particulate accumulation threshold. P244C evaluates the thermal result of regeneration; by itself it does not quantify filter soot mass or establish that the filter must be replaced.
Evidence that narrows the problem
A useful diagnostic record contains the upstream temperature trend, regeneration status, engine operating state and available commanded target. A temperature that rises but consistently remains short of target differs from an implausibly fixed sensor reading, although this summary does not assign a definitive cause to either pattern.
Verification requires a qualified assessment of temperature performance during a permitted regeneration event. An ordinary warm engine or a cleared fault cannot establish that this five-minute comparison passed. Exhaust and regeneration temperatures can be hazardous, so forced regeneration and component testing require the vehicle-specific professional procedure; this table is not authorization to initiate one.
Source and applicability
GM 2009 09OBDG01 Duramax Engine Diagnostics, only the cited ECM monitor. This historical calibration does not establish applicability to every Duramax vehicle or provide a complete service procedure.
Article source documents
Source checks describe how the text was prepared; they do not certify a diagnosis or confirm compatibility with every vehicle using this code.
Original code reference
Dictionary definition
Exhaust Temperature Too Low For Particulate Filter Regeneration Bank 1
This definition retains its original catalog scope. The article above is limited to its explicitly documented application.
Reference scope
Generic OBD-II definition.
A manufacturer label does not establish the model, year, engine or module to which a diagnosis applies. Read the safety and diagnostic limits.
Definition source
- DTC Database: pinned community code definitions
Source checked · MIT