p0300
Moderate
Buick · SUVs
Random/Multiple Cylinder Misfire Detected
Quick Answer
Error code P0300 on your Buick SUVs means: Random/Multiple Cylinder Misfire Detected. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Scan engine codes and check fuel pressure
2
Inspect and replace spark plugs if needed
3
Test ignition coil voltage with multimeter
4
Check fuel injector pulse with oscilloscope
5
Clean fuel injectors or intake valves
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Spark plugs
Ignition coils
Fuel system cleaner
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