OBD-II code · Powertrain (generic, extended)
P236C Cylinder 12 Pressure Too High
Cylinder 12 measured peak combustion pressure is above the calibrated maximum — typically pre-ignition, knock, over-fuelling, or runaway combustion.
Is it safe to drive with P236C?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyInjector overdelivery on cylinder 12
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–10 h
- Emissions test
- Likely to fail
- Parts involved
- Cylinder 12 Combustion
Related codes
- P039BCylinder 1 Pressure Too High
- P03A5Cylinder 2 Pressure Too High
- P03AFCylinder 3 Pressure Too High
- P03B9Cylinder 4 Pressure Too High
- P03C3Cylinder 5 Pressure Too High
- P03CDCylinder 6 Pressure Too High
- P03D7Cylinder 7 Pressure Too High
- P03E1Cylinder 8 Pressure Too High
- P234ECylinder 9 Pressure Too High
- P2358Cylinder 10 Pressure Too High
- P2369Cylinder 12 Pressure Sensor Circuit High
- P236ACylinder 12 Pressure Sensor Circuit Intermittent or Erratic
- P236BCylinder 12 Pressure Too Low
- P236DCylinder 12 Pressure Variation Low
- P236ECylinder 12 Pressure Variation High
- P236FCylinder 12 Combustion Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.