Check Engine Light Due to Gas Cap Issue on Buick Lucerne

Problem Description and Possible Solution

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

Problem Data
RepairPal Verified
Average mileage: 86,047 (19,600–191,000)
5 model years affected: 2006, 2007, 2008, 2009, more2010
38 people reported this problem
Viewing 1 - 17 of 17 comments
On a trip to Florida week of 22 Nov 10, after fillup the message "tighten Gas Cap" kept coming up. I tightened it and then it went away until the next fillup. This week, I have the Check Engin Light on and then sometimes it will come up with the "Tighten Gas Cap", but the check engine light still stays on. I am on the 3rd gas cap. Two from Buick and 1 from Avanced Auto. Now I am told that I need to run the car 7 times to get rid of the check engine light.
Check gas cap came on occasionally. Replaced gas cap and problem returned. I replaced the purge control valve (ac-delco part 214-1473,reset the computer and the problem has been fixed. The purge valve was not sealing when "closed" which would be similar to a bad gas cap.
Car – light indicator states to tighten gas cap. The gas cap can't be tightened any further therefore the light is still on and I don't know what problems will come out of this is not repaired
Check engine light comes on. sometimes would go off after tightening original gas cap. Now on constantly. Should I replace the gas cap?
Repeated 'check engine' light. Dealer already replaced 2 oxygen sensors; I replaced the original gas cap about 8 months ago
Check engine light illuminates after refueling, can correct bt playing with the gas cap. Takes a few miles (or starts) before the light goes out.
"Check Engine" light illuminates and remains lit until the gas cap is either removed and reinstalled OR replaced with new. I've had to replace the gas cap multiple times during my 9 years owning the car.
gas cap warning light comes on sporadically even after the gas was filled 4 days earlier. The engine warning light comes on and doesn't go off unless you reset it.
checked gas cap , retightened it with no results, later (150) miles the light went away upon starting the engine.