System: Ignition & Misfire · Standard: SAE J2012 generic code · Severity: Do not keep driving
This fault can damage expensive hardware within a short distance. Stop and diagnose before driving further.
A flashing check engine light during a P0300 means unburned fuel is reaching the catalyst. Stop driving and diagnose before the converter is destroyed.
Start by reading every stored and pending code, not just this one. A single fault frequently sets three or four codes at once, and the first one in the freeze-frame data is usually the cause while the rest are consequences.
The crankshaft speed signal shows misfires spread across multiple cylinders without identifying one. Random or Multiple Cylinder Misfire Detected is a generic ignition & misfire code defined by SAE J2012, so it carries the same meaning on every OBD-II vehicle.
Do not keep driving. This fault can damage expensive hardware within a short distance. Stop and diagnose before driving further.
In rough order of how often they turn out to be the problem: Worn spark plugs across the engine; Weak ignition coils; Low fuel pressure.
P0301 Cylinder 1 Misfire DetectedP0302 Cylinder 2 Misfire DetectedP0303 Cylinder 3 Misfire DetectedP0304 Cylinder 4 Misfire DetectedP0305 Cylinder 5 Misfire DetectedP0306 Cylinder 6 Misfire DetectedCode number, system and definition follow the SAE J2012 / ISO 15031-6 generic diagnostic trouble code standard. Symptoms, causes and severity are the standard generic diagnostic logic for that fault. This page does not contain manufacturer-specific procedures, part numbers or pricing.