Illumination of the Check Engine Light can be caused by a loose or worn gas cap.Google+
Car Problem Reports
Chevrolet Tahoe Check Engine Light Due to Gas Cap Issue
Chevrolet Tahoe Problem
Average Mileage: 120,222 mi (60,000 mi - 243,336 mi)
Visitor, 2006 Chevrolet Tahoe, 112,000 mi
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 $$$
Visitor, 2005 Chevrolet Tahoe, 60,000 mi
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.......
Visitor, 2003 Chevrolet Tahoe, 243,336 mi
check engine light stays on. Throws four codes
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.
Visitor, 2006 Chevrolet Tahoe, 75,000 mi
my i just unhooked light came on an the sensor throwing the code to get light off
Visitor, 2002 Chevrolet Tahoe
Gas cap was lose