OBD-II code guide
P0306 Cylinder 6 Misfire Detected
P0306 means the engine computer detected a misfire on cylinder 6.
What it means
Cylinder 6 is misfiring often enough for the computer to flag a fault.
Common symptoms
- Engine shaking
- Rough idle
- Poor power
- Flashing check engine light
- Fuel smell
Likely causes
- Ignition coil fault
- Worn spark plug
- Injector issue
- Compression problem
- Vacuum leak
First checks
- Stop hard driving if the light flashes.
- Confirm cylinder numbering for the engine.
- Swap-test only when safe and appropriate.
- Check for related fuel trim or coolant loss clues.