P244B
Diesel Particulate Filter Differential Pressure Sensor Offset
At engine off, the DPF differential pressure sensor does not return to zero within the allowed offset window. The static offset is too large to be ignored.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light or DPF warning light on
- Power loss / limp mode
- Increased fuel consumption
- Failed forced regeneration attempts
Common causes
Ordered by how often each turns out to be the cause.
- Sensor zero-point driftCommon
Parts involved
- DPF Diff Pressure Sensor
P244B is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.