Check Engine Light Due to Gas Cap Issue on Chevrolet Blazer

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

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Average mileage: 106,572 (13,000–221,392)
10 model years affected: 1996, 1997, 1998, 1999, more2000, 2001, 2002, 2003, 2004, 2005
29 people reported this problem
12 people shared problem details
My service engine soon light came on so I took it to the Chevy dealer. They checked everything out and said the engine was fine but I probably over-tightened the gas cap and that set off the engine light. Not a huge deal but rather inconvenient and sometimes costly because you have to pay a mechanic to check it out just to make sure its not something more serious.
Check engine light came on. I had Autozone check the reading and it showed the gas cap needed replacing. I replaced the gas cap twice and still the same problem.
check engine comes on but wont go off
have owned my blazer since 2003 and have replaced the gas cap 3 times.
When I bought the car 3 yrs ago, the check engine light was on. Have changed gas cap twice and it has never gone off.
check engine light stays on never got it fixed
Same exact problem the mechanic just turns off the code now,.
2004 Chevrolet Blazer115,000
i have the same problem
Recently had fuel pump replaced due to acceleration problems. Now the check engine light comes on, then off, then on again, then off again. now back on. WTF? I've been staying on top of maintaining Blazer {81,800 mi} since it was bought. Now the engine seems to be running a little rough and a little choppy when I begin acceleration. Other than that, car is running. Happened once a few years ago and it seemed that the oil was a little low. I added a quart, problem solved. light went off. This time around, added the oil, light went off, then came back on. still on, going on day three. I will wait to see what happens during the next 7-8 days of all city driving.
2002 Chevrolet Blazer221,392
My service engine soon light come on and goes off for a while then come back on
evap emmisions leak(small leak detected) so i replaced the cap,cleared the code and it never came back.
Check engine light came off, mechanic check this issue with his computer thingamagig and it was reading something to do with my sensors. He didn't do work on those because I just had an engine installed so they are suppose to be new. Then he turned my gas cap and light went out. It has come on again and so far I haven't done anything about it but am going to soon. He has got to recheck the engine and all components before I will be satisfied that it has nothing to do with the work he did.
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