P2BA5
Particulate Filter Feedgas Performance
The ECM detects that the exhaust gas composition reaching the particulate filter (feedgas) deviates from the calibrated profile. Soot input rate cannot be modelled correctly, affecting regen scheduling.
- 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.
- Exhaust leak upstream of DPFCommon
- EGT sensor pre-DPF driftPossible
Parts involved
- Particulate Filter
- Exhaust Gas Temp Sensor Pre DPF
P2BA5 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.