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Check Engine Light Due to Gas Cap Issue on Cadillac DeVille DTS

Problem Description and Possible Solution

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

Problem Data
RepairPal Verified
Average mileage: 87,166 (45,000–150,000)
5 model years affected: 2001, 2002, 2003, 2004, more2005
12 people reported this problem
Viewing 1 - 4 of 4 comments
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.
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 ??

The Griz
I am told the code refers to filling up gas tank wile engine is running. I have never done that