Buick LaCrosse Problem Report
Buick LaCrosse Check Engine Light Due to Gas Cap Issue
A Loose or worn gas cap may cause Check Engine Light to illuminate.
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
gas cap light cap looks ok then engine check light guess I should of bought a donkey - Visitor
Check engine light Leak in pressurized system Gas inlet defective Replaced $77 at dealer - Visitor
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. - tjp11
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
We had this issue too. Mechanic found the problem. - maximo9
Always low feul gas cap or chek gas cap - Visitor
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 sense....as it does appear to be related to the seal. - bkcastlerock
engine light - mayito
MY CHECK ENGINE LIGHT IS ON AND MY ONSTAR DIAGNOSTIC IS SAYING THAT IT HAS SOMETHING TO DO WITH THE EMISSION SYSTEM. - YSV
check gas cap would come on if you did not clear it then check engine light comes on - Herb M
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. - Visitor
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. - Visitor
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. - Visitor
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. - Visitor
Replaced gas cap. Problem returned again, 3000 miles later - Visitor
my b 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
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
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
engine light - ddmcclore
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