P236CCylinder 12 Pressure Too High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P236C flags combustion pressure in cylinder 12 above its allowed value. A public twelve-cylinder application does not exist. That a code of this kind need not involve a pressure sensor at all is shown by its cylinder-1 to -4 relatives P039B, P03A5, P03AF and P03B9 on Audi's 2015 S3 with the CYFB petrol engine: faulty ECM software logged misfires in its primary detection window, switched on the EPC lamp and shut a cylinder off (P130A00); new ECM software solved it. On a diesel with real pressure sensing, a dripping injector, too much pilot fuel or a sensor drifting upward are the usual suspects. High peaks strain pistons, rings and gasket, so cutting the cylinder with reduced power is a plausible protective reaction.
- What you may notice
- EPC or check engine lamp on
- Loss of power when the cylinder is switched off
- Harder combustion noise
- Likely causes
- PossibleEngine control software error (update available)
- PossibleInjector dripping or delivering too much pilot fuel
- RarePressure sensor drifting upward
- 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 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.