A Loose or worn gas cap may cause Check Engine Light to illuminate.
Car Problem Reports
Buick LaCrosse Check Engine Light Due to Gas Cap Issue
Buick LaCrosse Problem
Average Mileage: 47,619 mi (10,200 mi - 80,000 mi)
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.
We had this issue too. Mechanic found the problem.
Visitor, 2008 Buick LaCrosse, 80,000 mi
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.
Visitor, 2008 Buick LaCrosse, 22,098 mi
gas cap light cap looks ok then engine check light guess I should of bought a donkey
Visitor, 2006 Buick LaCrosse
LaCross has done this since day one I have had it back in a dozon times and was told that sensors are to senitive. this is from dealer!
Visitor, 2007 Buick LaCrosse, 55,000 mi
Check engine light and loose gas cap information came on at same time - but cap was tight. Dealer had better price on cap than parts stores. Issue solved.
Visitor, 2008 Buick LaCrosse
This has happened twice. The first time (under warrenty) an emissions valve was replaced & the light went off. The 2nd time (80K) the battery was replaced and the light went off for a month, but then came back on. Now (90k) the check engine light is always on & the gas cap message comes on intermittantly.
Visitor, 2006 Buick LaCrosse, 52,000 mi
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!!!!!!!!!!!!
Visitor, 2005 Buick LaCrosse, 37,000 mi
Check engine light
Leak in pressurized system
Gas inlet defective
Replaced $77 at dealer