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.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Particulate filter
- Exhaust gas temp sensor pre dpf
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Exhaust leak upstream of DPF
- EGT sensor pre-DPF drift
Possible symptoms
- Check engine light or DPF warning light on
- Power loss / limp mode
- Increased fuel consumption
- Failed forced regeneration attempts
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
- Reduced-power or limp mode may occur
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.