P235BCylinder 10 Combustion 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
- P235B rates how well cylinder 10 burns, derived from its pressure curve – for instance from the energy each working cycle releases or from how it compares with the other nine cylinders of a V10. No manufacturer documents this code, nor the cylinder-1 equivalent P039E. CARB supplies the background: diesel passenger cars equipped with combustion or combustion quality sensors must, from model year 2010, flag misfire once it reaches 5 % of firings, counted over 1,000 revolutions – far tighter than the continuous-misfire rule other diesels long had to meet. Coked or worn injectors, partial compression loss, intake air leaks or poor fuel degrade combustion. The engine shakes, smoke and consumption rise, and the code tends to appear together with P2357 or P2358 or with the cylinder 10 misfire code P0310.
- What you may notice
- Check engine light on
- Uneven running and vibration
- Increased smoke and fuel consumption
- Likely causes
- LikelyCoked or worn injector of cylinder 10
- PossiblePartial compression loss in cylinder 10
- RareAir leak in the intake tract
- RarePoor or contaminated fuel
- 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: €150 – €2,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.