Check Engine Light Due to Gas Cap Issue on Pontiac G5

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

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Average mileage: 88,715 (41,000–180,000)
3 model years affected: 2007, 2008, 2009
13 people reported this problem
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problem details
2009 Pontiac G5 42,000 mi,
This is what the technician at the Pontiac dealer told me; that it is a common problem with G5s. He told me to reseat the gas cap, but the light does not turn off right away. In my experience, it turns off about 2-2.5 days later. However I think I will just take it to the dealer and have the replace the cap. More of a nuisance than a real problem.
I took it into the dealer as a scan showed a pressure valveproblem and they where the only place to get the part.Lasted about 2 weeks then back where they said needed another part now up to 600.00.Go down the road and boom comes on highway driving.Goes back off in town pretty sure this pont all that was neede was cap.
2008 Pontiac G5 180,000 mi,
The display says check gas cap, gas cars is worn on my 08 model car!
I have had this problem multiple times, I've replaced it twice.