Originally Posted by Huntinman
Originally Posted by Fldoghunter
For the new owner, a couple times my 05 GMC was throwing a "vent valve" code. Each time it was the little canister that the fuel vent line attaches to. It's under the filler neck on the outside of the frame. The part is about $30 from advance. I don't have a part #, but probably could find it if you want me to. It is caused from topping the tank off too full and letting straight gas run down the vent line. Stopped trying to get that last dollar in and haven't had it happen since.


Good looking out. Thanks.

mine used to throw that code because of a bad gas cap $5 is worth throwing at it to atleastget the engine light off to sell