Check Engine Light Due to Gas Cap Issue on Buick LaCrosse

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

RepairPal Verified
Average mileage: 69,252 (10,200–167,000)
8 model years affected: 2005, 2006, 2007, 2008, more2009, 2010, 2012, 2014
48 people reported this problem
27 people shared problem details
2008 Buick LaCrosse80,000
Check gas cap light keeps coming on intermittently and now check engine light on. Replaced gas cap and okay for awhile. Both engine light and check gas cap light went off. Now, back on again. First check gas cap (which I did) and now engine light.
2008 Buick LaCrosse22,098
gas cap light cap looks ok then engine check light guess I should of bought a donkey
2005 Buick LaCrosse37,000
Check engine light Leak in pressurized system Gas inlet defective Replaced $77 at dealer
Check engine light stayed on. Remote diagnostic (Onstar)indicated that problem was with the gas cap. Took car to dealer, told them and they replaced the cap. Problem resolved.
2012 Buick LaCrosse36,701
The check engine light come on
2014 Buick LaCrosse19,000
Check engine lights comes on. I have to tighten the gas cap and it goes off. But this happens every time I fill the tank.
We had this issue too. Mechanic found the problem.
2006 Buick LaCrosse52,000
I have selected "me too" to 3 other common problems with the Lacrosse. I contacted buick for assistance on repairs and they said Garber Buick in Saginaw Michigan would only agree to $50 assistance on a $443 repair bill. How sad! But they had no problem taking bail out assistance from my tax paying money!!!!!!!!!!!!
I had the same problem with the check engine light always coming on. I would remove and replace the cap quite often and the light would eventually go off. Finally that stopped working so I went ahead and bought a new cap. Replaced the cap, filled the tank with gas, added some of that adatech additive for good measure, and the light went out the next day. It was worth a try because the Buick dealer would charge $130 for a diagnostic on the check engine light. Gas cap was $16 online. Another blog site mentioned putting vasoline around the seal area of the cap. Might be worth a try before getting a new cap. If my new cap starts acting up, I'm going to try the vasoline thing. Makes it does appear to be related to the seal.
2008 Buick LaCrosse89,000
Always low feul gas cap or chek gas cap
Steady engine light came on. Went to Auto Zone and they diagnosed the problem and sold me Techron Complete Fuel System Cleaner. In the meantime light went off. Going to use Techron the next time I fill up with gas.
2009 Buick LaCrosse89,000
on occation right rear lock doesnt unlock
check gas cap would come on if you did not clear it then check engine light comes on
2012 Buick LaCrosse27,213
Check engine light on first time at 18,000 miles this was due to a bad wire from gas tank to sensor fixed light went out at 27,000 miles it lit up again this time they had to drop the gas tank and replace the sensor.Will see if this comes back.
2008 Buick LaCrosse110,000
Check engine light came on at approx. 35,000 miles. Got gas cap replaced. Didn't have any more problems until approx. 110,000 miles. Have retightened the cap several times. Light went out the first few times. Now stays on. Will have to replace the cap again.
2008 Buick LaCrosse79,000
Intermittently check engine light and check gas cap message appear, I have tightened gas cap again and again. But this time the check engine light isn't going away. About 5th time now. As another post stated...I will try auto zone and see whatever code is given when the scan the system.
2010 Buick LaCrosse73,000
Check engine light is on and the dash reads "Tighten Gas Cap" . I've tightened the gas cap several times I'm taking the car to the dealer tomorrow.
2005 Buick LaCrosse60,000
Replaced gas cap. Problem returned again, 3000 miles later
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