Check Engine Light Due to Gas Cap Issue on Chevrolet Suburban 1500

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

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Average mileage: 115,246 (60,000–198,000)
9 model years affected: 1999, 2000, 2001, 2002, more2003, 2004, 2005, 2006, 2007
28 people reported this problem
7 people shared problem details
After repeatedly getting a Check Engine light after fueling, I took it to a dealership who informed me that the code that showed up when they hooked it up said that I needed a new gas cap. Well, I paid the big $$ there for the cap and a couple weeks later it came on Again!! This time I took it to my normal oil & tire guy who let me in on the real issue (in my case at least!) I hadn't been tightening the fuel cap enough "clicks"!! I might stop at 2-3 & he said turn til you hear at least 10! Otherwise the vehicle senses that as a "leak" in the fuel system, be it fuel or air/compression. This happens quite often in many other makes/models too! Hope this helps someone!
7 people like thisFlag inappropiate
The 'Tighten Gas Gap' came across monitor 2 days ago. I tightened gas gap. The monitor reading went away. This morning, the 'Tighten Gas Cap' came up on my monitor reading again. I turned car off for 1-1/2 - 2 hrs.. When I got back in car, started it up, while driving, the engine light came on. Panicking ..... Called a friend for a car repair persons name & they suggested I google the problem. I did. Yippee!! I found this is a 'problem' w/ this make and model year 2004 Suburban. I tighten the gas cap really, really hard & the engine light is no longer on. Thank you! Thank you! for those who've reported the same challenge.
2 people like thisFlag inappropiate
Check engine light came on and would not go off. Repairmen checked vehicle w/instrument and item was corrected
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Check engine light is still on. Just replaced gas cap.
1 person likes thisFlag inappropiate
Check Engine Light due to emissions issue that sounds like this one. Tech ran OBD2 scanner on it and found the code related to a fuel system emissions problem. Gas Cap is suspected.
Check engine light stayed on and once the cap was replaced, it stopped.
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