Check Engine Light Due to Gas Cap Issue on Chevrolet Tahoe

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

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Average mileage: 107,256 (18,000–243,336)
7 model years affected: 1999, 2001, 2002, 2003, more2004, 2005, 2006
25 people reported this problem
10 people shared problem details
2006 Chevrolet Tahoe112,000
I had this problem for over a year. Dealer "fixed" it for two weeks and $700. After being entirely frustrated I put it up on ramps myself and took a look underneath the rear of the car by the gas tank. Sure enough a hose was unplugged, I cleaned the oring in the fitting and snapped it back together. Problem fixed. NO $$$
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OMG, on going gas cap problem and engine light is going on. Way to expensive to pay a company to check the light and make the light go off. Really we need to buy a chip every time at $400. Any cheaper way to get this done?? Please give me ideas.......
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Gas cap was lose
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check engine came on and I went to my local O'reilly's and used there machine to diagnosis the problem. The issues was resolves after I took my Tahoe to the dealership to get repaired.
1 person likes thisFlag inappropiate
my i just unhooked light came on an the sensor throwing the code to get light off
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2003 Chevrolet Tahoe243,336
check engine light stays on. Throws four codes
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p0442 evaporative emission system leak b0035 b0040 l and r side front wheel senor s
2005 Chevrolet Tahoe135,000
Check engine light comes on and warning about 'tighten gas cap'. No fix yet. Mechanic suggested buying real GM or ACDelco gas cap
YOu can tighten the gas cap and it goes away--this is the 3rd gas cap we've replaced.
Engine light on due to gas cap issue but we have not been able to fix it, switch cap several times, problem continues.
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