Check Engine Light Due to Gas Cap Issue on Cadillac Eldorado

A Loose or worn gas cap may cause Check Engine Light to illuminate.

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Average mileage: 94,867 (60,000–143,100)
7 model years affected: 1996, 1997, 1998, 1999, more2000, 2001, 2002
10 people reported this problem
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problem details
1998 Cadillac Eldorado 143,100 mi,
I have a light on that says "check gas cap" and the service engine soon light is also on. Don't know why--just started today. I don't drive the car much anymore--only 2 days a week to work on Tuesday and Thursday.
1998 Cadillac Eldorado 60,000 mi,
The onboard diagnostic system gave me a check radiator cap notice. I check the cap and it was screwed on firmly. Apparently the cap is getting worn and it intermittently compromises the "Closed system". I have not had to replace the cap yet and the light has not come on in quite awhile. Until it comes on and stays on, I'll keep the old cap.
1998 Cadillac Eldorado 81,502 mi,
Engine code is diagnosed as a gas cap problem several previous times. However, the last 2 times this has happen a new gas cap from the dealer was installed. Not sure what to do next to fix the issue!