OBD
P236F
Cylinder 12 Combustion Performance
What it means
P236F means Cylinder 12 Combustion Performance.
Check these first
- A fouled spark plug or weak coil on cylinder 12
- A clogged cylinder 12 fuel injector
- Low compression in cylinder 12
- A vacuum leak feeding cylinder 12
What to do next
- Read misfire counters and cylinder 12 balance on a scan tool
- Inspect the cylinder 12 spark plug and coil
- Test the cylinder 12 fuel injector
- Perform a compression test on cylinder 12
- Repair the cylinder 12 fault found and recheck
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.