P0300 Random/Multiple Cylinder Misfire Detected
What does P0300 mean?
P0300 — Random/Multiple Cylinder Misfire Detected. This is an OBD-II diagnostic trouble code a scanner retrieves when your vehicle's computer detects random/multiple cylinder misfire detected. The level of risk depends on how the vehicle is currently running and how long you've been driving with the light on.
Common causes of P0300
- Worn or fouled spark plugs
- Failed ignition coils or spark plug wires
- Vacuum leaks in the intake system
- Low fuel pressure or clogged fuel injectors
- Mechanical compression issues or a weak fuel pump
How to fix P0300
- Read freeze frame data and live misfire counters with an OBD-II scanner
- Inspect spark plugs, wires, and ignition coils
- Smoke test the intake for vacuum leaks
- Check fuel pressure and injector performance
- Perform a compression test if misfires persist around the same cylinders