Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
Car problem reports
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Most reported 2005 Chevrolet Uplander problems
The high pressure power steering hose will commonly leak fluid and should be replaced if this is the case.
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 front struts may show signs of wear, or be excessively bouncy ride at freeway speeds. This may begin to occur at around 75,000 miles.
One or more of the power windows may stop working due to a failed window switch. Failed switches will require replacement.