Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
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Newest reported 2006 Pontiac Montana problems
Corrosion at the fuel tank to body harness may cause the Check Engine Light to illuminate or a crank no start condition. This corrosion issue is most commonly caused by a water leak inside the vehicle. Any damaged wiring or connectors will require replacement.
The high pressure power steering hose will commonly leak fluid and should be replaced if this is the case.