P244B: Diesel Particulate Filter Differential Pressure Too High
Pressure across the DPF is higher than expected. The filter is restricted.
Green, yellow, red: three ways P244B can look
The same code can be a quick fix or a reason to pull over. Match your situation to the closest example.
Keep an eye on it
Light on, drives fine.
Schedule a repair
Power loss or regens failing. Book diagnosis.
Stop and get help
Severe derate. Stop.
Symptoms you might notice
- DPF light
- Power loss
Common causes, cheapest first
- Soot-loaded DPF
- Ash-loaded DPF
- Plugged sensor hose
What you can check before calling
- Note idling habits and regen history
A code points to a system, not a part. Replacing parts based on the code alone is how people spend money without fixing the problem. Testing confirms the cause first.
Want the full story? Read our guide: DPF regeneration explained: passive, active and forced.
Generic codes (second character 0) mean the same thing on every vehicle. Some manufacturers add their own details, so check service information for your exact vehicle.
Related codes
More diesel & cummins codes
- P2002
Diesel Particulate Filter Efficiency Below Threshold (Bank 1) - P2459
Diesel Particulate Filter Regeneration Frequency - P2453
Diesel Particulate Filter Pressure Sensor A Circuit Range/Performance - P2454
Diesel Particulate Filter Pressure Sensor A Circuit Low - P2455
Diesel Particulate Filter Pressure Sensor A Circuit High - P244A
Diesel Particulate Filter Differential Pressure Too Low
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does P244B mean?
P244B means "Diesel Particulate Filter Differential Pressure Too High". Pressure across the DPF is higher than expected. The filter is restricted.
Can I drive with code P244B?
It depends on what the vehicle is doing. Green: Light on, drives fine. Yellow: Power loss or regens failing. Book diagnosis. Red: Severe derate. Stop.
What causes P244B?
The most common causes are: soot-loaded DPF; ash-loaded DPF; plugged sensor hose.
Is P244B a serious code?
It can be. Severe derate. Stop.
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