Check Engine Light Due to Gas Cap Issue on Chevrolet Tahoe

Problem Description and Possible Solution

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

Problem Data
RepairPal Verified
Average mileage: 112,052 (16,000–245,500)
Exhaust & Emissions affected: Gasoline
14 model years affected: 1996, 1997, 1998, 1999, more2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
62 people reported this problem
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Viewing 1 - 18 of 18 comments
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.......
Engine light on due to gas cap issue but we have not been able to fix it, switch cap several times, problem continues.
Check engine light came on gave a code that there was a minor emission system leak.
Tahoe does not get driven much as you can see only 41075 miles now check engine light is on and goodyear said it is fuel system not pressurized correctly. ???
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.
service engine lights stays on telling me that its my gas cap.
check engine light stays on. Throws four codes
Check engine light on for bad gas cap (2nd time)
p0442 evaporative emission system leak
b0035
b0040 l and r side front wheel senor s
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 $$$
YOu can tighten the gas cap and it goes away--this is the 3rd gas cap we've replaced.
Check engine light comes on and warning about 'tighten gas cap'. No fix yet. Mechanic suggested buying real GM or ACDelco gas cap
my i just unhooked light came on an the sensor throwing the code to get light off
this is the fourth time over the last 6 or so years I have had the light go on. First some sort of cylinder had a pin hole and was replaced, it took a while for mechanic to find the problem.Two more times mechanic just fixed by replacing the gas cap .The fourth time, well I have to bring in and see. Starting to wonder if I need a new mechanic...
Gas cap was the issue
"Service engine soon" light-code '440' and 440pd' "evaporative system fault" occurs when tank reaches the half empty point usually. tighten cap erase code and go.
I repeated had the check engine light come on after I bought my truck (used w/ 16000mi). This took 8 trips to the dealer before they figured out it was a fuel line issue. The metal receiver for the gas cap wouldn't secure properly. Since it was a used car when I bought it I couldn't do the normal lemon law suit. I was able to sue for breach of contract and had GM award me money for the time & effort of 8 trips to the dealer and missed work hours.