OBD-II code guide
P0308 Cylinder 8 Misfire Detected
P0308 means cylinder 8 is misfiring often enough to trigger a trouble code.
What it means
Cylinder 8 has incomplete combustion or inconsistent power contribution.
Common symptoms
- Rough running
- Shaking under load
- Poor power
- Flashing check engine light
- Possible catalyst smell
Likely causes
- Faulty coil
- Worn spark plug
- Injector fault
- Low compression
- Vacuum or intake issue
First checks
- Record all misfire codes.
- Confirm cylinder numbering before replacing parts.
- Check plug, coil, injector, and compression clues.
- Do not keep driving with a severe misfire.