Check Engine Light Due to Gas Cap Issue on Chevrolet Suburban 2500

Illumination of the Check Engine Light can be caused by a loose or worn gas cap.

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Average mileage: 54,000 (54,000–54,000)
4 model years affected: 2007, 2008, 2009, 2010 more
5 people reported this problem
1 person shared problem details
On vacation in Florida, 1200 miles from home. Check engine light illuminates and I was lucky enough to be in an area where there was a dealer who stayed open later in the evening. The gentleman at the entry gate ran the code and it came back as a gas cap failure. Purchased and installed new cap and dealer reset computer. This seemed to be a cheap and easy fix. Approximately 800 miles into my return trip I recieved the same code via On-Star. I have replaced the cap 3 times with OEM equipment. Problem still exists. No problems with performance but I live in an area that requires emission inspections and now the code returns before the 100 mile requirement for the state regualated equipment will allow my inspection.
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