Check Engine Light Due to Gas Cap Issue on Buick Century

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

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Average mileage: 91,249 (28,000–169,000)
11 model years affected: 1994, 1996, 1997, 1998, more1999, 2000, 2001, 2002, 2003, 2004, 2005
42 people reported this problem
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Viewing 1 - 17 of 17 problem details
The Check Engine light remains on constantly. My mechanic is baffled as to why this is occurring.
2000 Buick Century 98,000 mi,
still not fixed have had the problem for years. Have had it into the shop they said gas cap replaced that it worked for about a week then back to the same problem everything has been checked they find no reason for it
2003 Buick Century code P0442. Evap system (small leak). Bought replacement fuel cap from GM (I read that it must be from GM). No "service engine light" after 50 miles.
got to click that gas cap at least 5 times when replacing it.
When I bought my car, I bought a locking gas cap. When I took my car to get it fixed, the guy told me to try the old gas cap and the check engine light went off.
2005 Buick Century 123,000 mi,
check engine light came on. Mechanic checked code, cleared it and suggested we tighten gas cap to at least three "clicks". Three months later problem has not returned
1998 Buick Century 28,000 mi,
Replaced the OEM gas cap with an aftermarket gas cap.
2003 Buick Century 139,000 mi,
Not fixed. Constant Check Engine Light on. I cannot determine the problem.
2001 Buick Century 169,000 mi,
gas cap hard to put on right , causes the check engine light to come on the next few miles
2000 Buick Century 100,000 mi,
NEVER overfill your gas tank. When filling up and the gas hose clicks off at the pump DO NOT fill to max. Also Make sure the gas cap is tight after filling so as not to create a vaccum. Common sense fixes this problem.
1997 Buick Century 41,000 mi,
Replaced worn gas cap.
1994 Buick Century 70,000 mi,
had to replace gas cap
2005 Buick Century 88,000 mi,
check engine light came on and stayed on code said vacume leak I replaced gas cap with new one and cleared code and light never came on again.
I had to have the gas cap replaced because the light kept coming on and once the cap was changed no more problems.
Was in Florida and the light came on and when I got gas the cap was lose, tightened it up drove for a 1000 miles ant went off. Later same problem tightened it and light went off in a few miles.