Check Engine Light Due to Gas Cap Issue on Buick Lucerne

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

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Average mileage: 85,778 (19,600–191,000)
5 model years affected: 2006, 2007, 2008, 2009, more2010
32 people reported this problem
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problem details
2006 Buick Lucerne 28,990 mi,
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.
2006 Buick Lucerne 90,800 mi,
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 came on and stays on and yet the dealer can't find anything wrong.
2006 Buick Lucerne 45,000 mi,
Repeated 'check engine' light. Dealer already replaced 2 oxygen sensors; I replaced the original gas cap about 8 months ago
2007 Buick Lucerne 120,000 mi,
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.
2006 Buick Lucerne 80,250 mi,
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.
Engine light, tighten gas cap.
2008 Buick Lucerne 97,000 mi,
engine light comes on ..checked the gas cap is very loose..will not tighten
First i got a "tighten gas cap" error message then after about a week i started getting check engine
2006 Buick Lucerne 109,000 mi,
Check engine light comes on. sometimes would go off after tightening original gas cap. Now on constantly. Should I replace the gas cap?
2006 Buick Lucerne 191,000 mi,
Check engine light comes on. After fill up it normally goes off again. Will get new gas cap.
2006 Buick Lucerne 82,400 mi,
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.
Took it back to where I purchased it and engine light stayed off one week
2007 Buick Lucerne 159,000 mi,
Got error from car. Replaced no more error.
2006 Buick Lucerne 99,000 mi,
I have to reset gas cap when engine light comes on - which causes the engine light to go off.
2008 Buick Lucerne 19,600 mi,
checked gas cap , retightened it with no results, later (150) miles the light went away upon starting the engine.