OBD codes / P0300
P0300
SeriousRandom/Multiple Cylinder Misfire Detected
Address promptly — can worsen or affect drivability.
Likely causes
- worn spark plugs
- faulty ignition coils
- vacuum leak
- fuel delivery issue
Common fixes
- replace spark plugs
- replace coil packs
- inspect for vacuum leaks
Seeing P0300 on your car? Get a diagnosis specific to your exact year, make and model.
Diagnose P0300 for my vehicleGeneric OBD-II reference. Manufacturer-specific behavior varies — confirm with a scan tool and, for safety-related codes, a professional inspection.