Sooo about 3 weeks ago I got a CEL and got it scanned. Cameback the EVAP system. Replaced the gas cap and disconnected the battery to reset it... well it cameback. Any suggestions?

 

Now you need to tighten the cap.

 

I have, I've reset the system 3 times and it has comeback still, what else could it be?

 

It might be a hose then. If you have warranty, take it to the dealer.

 

I have warranty for drivetrain, nomore bumper to bumper.

 

I believe there are several EVAP codes. Are you throwing just one or several of them?

I found this:

"If you first get a P0442 or P0456 then a while later get a P0455 it is a sign a hose is going bad. If you get a P0455 (large leak) at the outset it more likely a stuck valve or a hose which came loose.
A smoke machine is the fastest way to finds leaks in these systems but not a common tool for do it your selfers."

 

I had the same thing last month. Turns out it was the vent tube. What code is it?

This might help...

https://www.cobaltss.net/forums/general-cobalt-68/three-trips-dealer-spiders-nest-127844/

 

code be vent solenoid stuck open, they are located on the rear of the vehicle near the charcoal canister out in the open. the elements get to it and causes it to fail..

Also any leaking hose in the fuel system will cause a CEL..

Pretty much no one on the internet is going to be able to pinpoint it out, they can tell you maybe its this or maybe its that, but the only way to know for sure is to get it smoked, bring it to a shop capable of this

 

I finally took it to the dealership to see what was up... seems my purge valve is stuck open. It is going to cost 174 to fix.