A Loose or worn gas cap may cause Check Engine Light to illuminate.Google+
Car Problem Reports
Cadillac DeVille DTS Check Engine Light Due to Gas Cap Issue
Cadillac DeVille DTS Problem
Average Mileage: 87,166 mi (45,000 mi - 150,000 mi)
Visitor, 2005 Cadillac DeVille DTS, 45,000 mi
Every once in awhile the check engine light has to be cleared due to a gas cap issue. I have not replaced the gas cap.
Visitor, 2003 Cadillac DeVille DTS, 88,000 mi
Just purchased this car for cheap money.....but it's gorgeous. Haven't put 300 miles on it and now I'm replacing the Torque Converter, & the check gas cap light keeps coming on. Hope I didn't make a big mistake by buying this car ??
change 3 gas caps
Visitor, 2003 Cadillac DeVille DTS, 150,000 mi
I am told the code refers to filling up gas tank wile engine is running. I have never done that