OBD
P0308
Cylinder 8 Misfire Detected
What it means
P0308 means Cylinder 8 Misfire Detected.
Check these first
- Faulty spark plug or ignition coil on cylinder 8
- Clogged or leaking injector on cylinder 8
- Vacuum leak at the cylinder 8 intake runner
- Low compression in cylinder 8
- Camshaft or valvetrain wear on bank 2
What to do next
- Verify cylinder 8 misfire counts with an OBD-II scanner
- Swap the coil and plug to see if the misfire follows
- Test the cylinder 8 fuel injector
- Compression test cylinder 8
- Inspect bank 2 intake gaskets for leaks
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Updated
Generic SAE J2012 definition. Last updated 2026-08-30.