Check Engine Light Due to Gas Cap Issue on Chevrolet Trailblazer

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

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Average mileage: 91,453 (9,998–221,000)
8 model years affected: 2002, 2003, 2004, 2005, more2006, 2007, 2008, 2009
118 people reported this problem
61 people shared problem details
I have replaced the gas cap and it still does it at times. I am not convinced that the problem is in the cap, perhaps it is in the sealing surface of the tank neck.
I have replaced the gas cap I cannot even remember how many times, same problem, check engine light on. My mechanic told me it has always been a problem with the Trailblazer, ignore it he Why hasn't Chevy recalled this and solve everyones problem!
I had the tighten fuel cap come on, then the SES light came on. I replaced the fuel cap at auto zone. I unplugged the battery to reset the SES light. It went off. Then driving to work today I got the tighted fuel cap!
I have put 3 caps on and it stops for a month or two then does it again.
stupuid freaking engine light on!! got the tighten fuel cap message first, then poof! the lovely engine light! replaced gas cap, had light shut off, only to go back on again like 2 days later! gotta get this figured out as I got a rejection for my inspection sticker! ugghhhh!!
My check engine light came on and then I was told that if you have low gas or the cap isnt on tight then the light will come on.. I had low gas so once I filled it up the light went out.. Nice thing to know..
Yeah, I bought my car from the Chevy dealership used. Two weeks after I had bought it, my check engine light came on! So I brought it back to the dealership, and they told me it was the gas cap and it needed to be replaced. It costed me about $100. TWO WEEKS AFTER I BOUGHT IT. Poor customer service, in my opinion.
About a week ago the gas cap light came on. So I pulled over and tighten the cap, and It went out. So today the check engine light came on and I push the onstar button for them to do a diagnostic test on my truck. After they did the test he said to check the gas cap, and it should go out.It didnt he said if it dont go out in 7 days go to dealer. So tomorrow I will go and get a gas cap and fill my tank up. Wish me luck Trailblazer owners
Gas cap failed suddenly. Replaced at Autozone and SES light reset within 400 miles
This happens whenever I change gas stations, so I only fill up at BJ's and the light goes out-lol.
Tighten fuel cap comes on the a day or two later check engine light comes on i have replaced gas cap and problem still happens. Mechanic hooks it up and it says there is a gas leak and then he resets it then light comes back on a week later. I think its time for Chevy to have a recall and fix the issue
Check Engine Light Due to Gas Cap Issue
Replaced cap with one bought from the Chevrolet place. Light continued to come on at intervals. Had car repaired and light still comes on at intervals.
i bought new gas caps 4 to be exact, I went to the dealer and bought a factory one and so far its been ok
Now at 101,000 miles i gave up on gas caps and replacing vent lines
The check engine light comes on and after opening the gas cap and putting back on and driving for a while goes off.
Gas cap light and engine light, never buy a Chevy again
Check engine light appeared and shortly after gas cap light appeared, had to buy a new gas cap.
Check engine light came on with the gas cap indicator light. Replaced gas cap and problem still persists.
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