Random/Multiple Cylinder Misfire Detected
What does this mean?
Code P0300 indicates the PCM has detected misfires occurring randomly across multiple cylinders. This is often more difficult to diagnose than single-cylinder misfires because the root cause affects the entire engine.
Disclaimer: This diagnostic code is part of the standard OBD2 system and can apply to Mazda Cx-50 models manufactured from 1996 to 2026. However, please note that the presence of this specific code depends on your vehicle's exact engine configuration, options, and production year.
Common Causes
Worn or fouled spark plugs
Faulty ignition coil or coil pack
Clogged or faulty fuel injector
Vacuum leak in intake system
Weak or failing fuel pump
Faulty fuel pressure regulator
Intake manifold gasket leak
Blown head gasket
PCM/ECM software needs update (TSB)
Symptoms to Watch For
- Check Engine Light is illuminated
- Engine misfiring or shaking sensation
- Rough or unstable idle
- Unusual vibration during driving
- Significant loss of engine power
- Poor acceleration or sluggish response
- Decreased fuel economy
- Failed emissions test
- Hesitation or stumble during acceleration