P2BA5Particulate Filter Feedgas Performance
- 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
- Some diesel particulate filters carry a precious-metal coating that, besides helping burn soot, oxidises NO to NO2 for the SCR catalyst further down. P2BA5 says this coated filter fails to supply enough NO2. CARB 13 CCR 1968.2 (f)(9.2.4)(B) demands the check for medium-duty diesels from 2016 and for passenger cars and light trucks from 2019, and lets the maker evaluate the filter alone or together with the oxidation catalyst. Cummins describes judging both by the heat they release after a fuel dose; FEV tests feed gas quality with the NOx sensors around the SCR. No maker documents P2BA5 publicly. Unlike P2002, which flags filtration loss, this code is about the coating; the driver sees the MIL and may later notice weaker passive regeneration.
- What you may notice
- Malfunction indicator lamp on
- More frequent active regenerations
- SCR efficiency codes may follow
- Likely causes
- LikelyFilter coating thermally aged, e.g. after very hot or uncontrolled regenerations
- PossibleAsh or oil additives covering the catalytic layer
- PossibleWeak upstream oxidation catalyst in a combined evaluation
- RareExhaust temperature or NOx sensor reading wrongly
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €500 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.