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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 354 (Engine Controls Self-Diagnostics) >> Diagnostic Tests >> DTC P0300-P0306: Engine Misfire Detected >> Diagnostic Aids

Diagnostic Aids

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Excessive vibration from sources other than the engine could cause DTC P0300 to set. The following are possible sources of vibration: Variable thickness brake rotors or worn or damaged accessory drive belt.

Spray water on the secondary ignition components using a spray bottle. Look and listen for arcing or misfiring.