p0300
Moderate
GMC · Trucks
Random/Multiple Cylinder Misfire Detected
Quick Answer
Error code P0300 on your GMC Trucks 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
Perform comprehensive engine diagnostics
2
Inspect and replace spark plugs if needed
3
Check ignition coil operation
4
Test fuel pressure and injector spray pattern
5
Perform cylinder compression test
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
Engine oil
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