p0300
Moderate
GMC · SUVs
Random Misfire Detected
Quick Answer
Error code P0300 on your GMC SUVs means: Random Misfire Detected. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Perform engine compression test
2
Inspect and replace spark plugs
3
Test ignition coils with multimeter
4
Check fuel injector operation
5
Scan for additional fault codes
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 coil
Fuel injector
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