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Check Engine Light Due to Gas Cap Issue on Buick Terraza

Problem Description and Possible Solution

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

Problem Data
RepairPal Verified
Average mileage: 101,393 (75,000–157,000)
3 model years affected: 2005, 2006, 2007
20 people reported this problem
Viewing 1 - 8 of 8 comments
The check engine light stays on and periodically the indicator warning flashes saying check gas cap. I have replaced the gas cap, but nothing changed.
The check engine light came up due to gas cap issue. does anybody know how to correct this issue?
gas cap light comes on and the next day chech engine light comes on; ask dealer about this and he stated there could 5 0r 6 things that cause this--to check this $90.00 not counting repairs.
Check engine light illuminates periodically but then corrects itself.
Same issue, engine light is on. It states to "check gas cap." I replaced the gas cap twice and had the dealer to reset the light. Came back on the next day.
check gas cap is on .changed it with a new one check engine light came on .then gose out again .has a new gas cap on still light is on
Check gas cap warning starting coming on last week. On Sunday the check engine light came on and stayed on. I have tightened, unscrewed and screwed the gas cap. Electrical? Also, has anyone else had problems with the radio? I can turn it on, but there is no sound. If I turn the car off and restart, the radio works again. The display shows the radio/CD player on, but no sound.
Check engine light came on. Replaced gas cap and light went off.