Diagnostic Aids
WARNING: This page is about a different car, the 2003 Pontiac Montana, 2003 Oldsmobile Silhouette, and 2003 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.
- Excessive vibration from sources other than the engine could cause DTC P0300 to set. Check sources of vibration, such as variable thickness in brake rotors, or worn/damaged accessory drive belt.
- Spray water on the secondary ignition components using a spray bottle. Look and listen for arcing or misfiring.