P236F: Cylinder 12 Combustion Performance
Standardized SAE J2012 code · P23xx — Ignition system and misfire
What does P236F mean?
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.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Mean effective pressure outside model
- Low Gateway module routing CAN messages incorrectly
- Low CAN terminating resistor (120 Ω) drifted out of spec
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P236F on the same make and model first.
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