Check Engine Light Due to Gas Cap Issue on GMC Yukon

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

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Average mileage: 118,142 (60,000–280,000)
Exhaust & Emissions affected: Gasoline
14 model years affected: 1996, 1997, 1998, 1999, more2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
24 people reported this problem
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problem details
My check engine light comes on frequently and when i push the onstar button for them to run a diagnostic check they say it is an emissions problem and to take it in if the light does not turn off 7 more times after running your vehicle. This becomes annoying when you take it to the dealer and they want to charge you for checking out the vehicle and just say they needed to replace the gas cap, and then the light is reset, then a month or two later the light turns on again and it is the same issue, instead of just replacing the cap fix the real problem and stop charging people to make money!
2004 GMC Yukon 280,000 mi,
tighten fuel cap notification comes on - and then goes off. haven't replaced cap yet now have check engine light...
2007 GMC Yukon 102,000 mi,
same problem changing the cap tomorrow
2007 GMC Yukon 75,000 mi,
Same issue with my yukon, light is on and I replaced gas cap. Check engine light is still on
Had the same proble shortly after purchasing my vehicle. Dealer replaced gas cap and no further problems.