P246D
Particulate Filter Pressure Sensor A and B Correlation
The two DPF differential pressure sensors A and B disagree by more than the diagnostic tolerance - one of them has drifted.
- 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.
- One sensor has driftedCommon
Parts involved
- DPF Pressure Sensor A
- DPF Pressure Sensor B
P246D 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.