P2DCD
Particulate Filter B Incorrect
The ECM detects that the installed particulate filter B does not match the expected type or specification. Wrong replacement part or substrate damage.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
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.
- Wrong DPF type installedCommon
- Substrate damaged or missingPossible
Parts involved
- Particulate Filter B
P2DCD 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.