Powertrain
generic / SAE
P236F
Cylinder 12 Combustion Performance
The closed-loop combustion controller reports that combustion performance on cylinder 12 is below the calibrated quality metric. Computed from the cylinder pressure trace — IMEP (indicated mean effective pressure), CA50 (50% mass burnt angle) or peak pressure deviates from the model.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number3 / 6F
Possible causes
- Mean effective pressure outside model high
- Gateway module routing CAN messages incorrectly low
- CAN terminating resistor (120 Ω) drifted out of spec low
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 400–2500 €
- Estimated time: 1.5–6 h
- Component: cylinder 12 combustion
- Component: cylinder pressure sensor 12
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012