Check Engine Light Due to Gas Cap Issue on Buick LeSabre

Problem Description and Possible Solution

Illumination of the Check Engine Light may be the result of a loose or worn gas cap.

Problem Data
RepairPal Verified
Average mileage: 119,263 (41,000–237,611)
10 model years affected: 1996, 1997, 1998, 1999, more2000, 2001, 2002, 2003, 2004, 2005
154 people reported this problem
Viewing 1 - 20 of 59 comments
gas cap loose warning light comes on.
I replaced the gas cap with a new one and it does the same thing from time to time and the gas cap seems to be tight.
Service engine soon light came on this past march, (2012) took car in, they sanded off some rust where the gas cap screws on, worked fine until two days ago service engine light came back on...taking it back in tomorrow...any suggestions?
Service vehicle soon light on and message said check for loose gas cap. Problem solved by replacing worn and deteriorating fuel pressure harness which is attached to the fuel pressure regulator. Does not require a mechanic to do really. GM part #2450-6640.
Gas Cap Loose, Check Cap Message AND Check Engine Light.
check engine light came on - took it in to mechanic - code indicated gas cap seal failure - new gas cap cured it for a month or so, now the error code is back and won't go away
i had the same issue and i wouldnt pass inspection because of it... i went to an auto repair and the guy said he had to suck the air out of my tank and never came on since and thats been like last November
that happened to me too but u can kinda fix it by disconnecting and reconnecting the negative battery cable. it resets the computer.
Service engine soon light until gas cap is screwed on again.
bought car with 49kmi..within a month the check gas cap light came on , ended up reading poses and purchased a new cap -- light went off -- a month later it is back on..
I cleaned the entire area around the gas cap, I had a hand vacume to suck any
patricles up
Happens about once every couple weeks, will sometimes go off after I get gas but will sometimes stay on for weeks
Check gas cap is on constantly
THE GAS CAP WAS THE PROBLEM ALL THE TIME. i BOUGHT A REPLACEMENT COP AT pEP bOYS AND CHANGED IT MY SELF when I had the engine oil and filter changed. Wheeew! That problem went away. I previously heard horror stories about having to have smoke tests to find a system air leaks and several others which are HUGH money maker evaluations that draw the unsuspecting car owners to buy into these false claims.
The check engine, and also the gas cap loose, indicators have come on in the last ten days or so. I haven't panicked so far since this is my fourth occurence. Being kinda ignorant I first took it to my friendly Buick dealer where I bought it used in October 2006, with 28000 miles on it. They were kind enough to diagnose the problem, for a whole bunch of money, & give me a new gas cap for about $500 or so. It took two trips.
That lasted for about 11 1/2 months until, oops, here it is again. this time they only charged me about $150. They told me it went bad before the 1 year warranty period expired, but I had put 15000 miles on my car in the last year, so there was no warranty coverage. I guess those were 15000 really hard miles on that gas cap.
Needless to say, I'm selling my Buick. I give up. I'm buying something made in Japan (or Korea) or wherever.
This is just the short form of my Buick experiences. I never did tell you about my entire gear shift, linkage & all, falling apart. But for what it's worth, I'm outta here! See ya!
Check engine light came on...the mechanic plugged the car into his diagnostic computer. According to the code, he said it's probably a problem with the gas cap. He replaced it...that fixed it.
Check engine light comes on and than go off
forgot to put gas cap back on when I left the gas station and while driving I noticed my Check Engine ligt was on. My mechanic check it out with his guage, reset the Check Engine light and told me to make
sure I always put the gas cap back on and click it "Three 3 times" before I put the key back in the ignition. He told me "no charge, I'll get you next time". I tipped him a $5 and haven't had any problems since.
Problem was intermittent check engine light coming on. Eventually found gas filler tube cracked. Replaced it. Everything OK now.
light on, chevrolet dealer put on computer to find & they corrected it.
I have this same issue