P2BD2Exhaust Aftertreatment System A Leak
- 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
- P2BD2 reports that the first aftertreatment line, or the only one, is not gas-tight, so exhaust escapes between engine and tailpipe or false air enters. A leak upstream of the catalysts lets untreated NOx and soot out and also confuses sensors: Foton Cummins patented a check that compares the measured aftertreatment pressure with a model value from exhaust back pressure and flags a leak beyond a limit, noting that leaks also cause urea crystals and false NOx efficiency faults. Ford describes telling a leak near the particulate filter apart from a slow catalyst sensor. CARB is studying how much such unfiltered leaks add to truck emissions. No maker documents P2BD2 publicly; P2BD3 covers system B. The driver may notice exhaust smell, ticking noises and the MIL.
- What you may notice
- MIL on
- Exhaust smell, soot marks or ticking at a joint
- Follow-up SCR or particulate filter codes
- Likely causes
- LikelyLoose V-band clamp or failed gasket between aftertreatment modules
- PossibleCracked exhaust pipe, flex joint or catalyst housing
- PossibleLeak at a sensor, DEF injector or pressure tap mounting
- RarePressure sensor hose cracked, making the system look leaky
- 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: €80 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.