Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
Problems for specific Cadillac DeVille years:
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Most reported 2001 Cadillac DeVille problems
The steering wheel position sensor may fail, resulting in the service stability message being displayed.
Just started last week. This warning has always lit up if I make a sudden stop, but then goes away. Last week it did not go away and now stays on all the time, even though the coolant level is fine.