P0300High severity
Random/Multiple Cylinder Misfire Detected
The ECM detected misfires across multiple cylinders, meaning combustion is not happening reliably in more than one cylinder.
Common causes
- Worn spark plugs or ignition coils
- Vacuum leak
- Low fuel pressure
- Faulty fuel injectors
Possible symptoms
- Flashing Check Engine Light
- Rough idle
- Engine shaking
- Loss of power
Code breakdown
P — System
Powertrain (engine, transmission, fuel & emissions)
0 — Type
Generic (SAE standard, common to all manufacturers)
3 — Subsystem
Ignition system or misfire