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 2007 Buick Rendezvous problems
The intake manifold gasket may develop and external engine oil or coolant leak. In some cases, an internal coolant leak may occur causing coolant to mix with the engine oil. Running the engine with a coolant/oil mix may result in engine damage. Replacing the intake manifold gasket should correct this issue.
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.
The high pressure power steering hose will commonly leak fluid and should be replaced if this is the case.
My local dealer service has been trying to fix this problem for over six months: AC/H does on and off. Either it will not turn on when I start the car and then (sometimes) it will come on when I hit a bump. Or, it will come on when I start the engine, and turn off when I hit a bump.
I am only a university literature professor, but that seems like an electrical wiring short or loose connection to me. So far, the electric techs have changed fus...