P2DCDParticulate Filter B Incorrect
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2DCD is meant for a second particulate filter, labelled B, that the engine control unit finds to be absent or not the specified part, for instance after the filter has been cut out, replaced by an empty housing or swapped for an unsuitable aftermarket unit. No manufacturer documents P2DCD publicly, and makers catch such tampering with other codes. CARB's rules for diesel vehicles and heavy-duty engines require a fault when the filter body is wrecked or taken out, or the whole unit gives way to a silencer or plain tube. Ford's 2024 gasoline summary performs this check on its second filter as P226E (bank 2): with exhaust flow of 300 to 850 m³/h and the filter above 250 °C for 30 s, normalised backpressure under 1.0 for 5 s means a missing brick. Filter A: P24FD. Expect a MIL and a failed inspection.
- What you may notice
- Check engine light on
- Failed emissions inspection
- Louder exhaust or visible soot at the tailpipe
- Likely causes
- LikelyFilter B removed or replaced by an empty housing or pipe
- PossibleUnsuitable replacement filter fitted
- PossibleFilter substrate cracked, melted or blown out
- RareLeaking or blocked pressure lines misleading the detection
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.