CELs won't leave a notification on any vehicle screens, from my experience, you need to get it hooked up to a comp to tell you the cause. You can do this at either a shop, Autozone, Pepboys, etc.. Or dealer.. I recently had one for a bad sensor in the engine, but I got it looked at through the dealer under warranty.
Cars with real gas caps the most likely cause is the gas cap not tight.
With this capless system it could just be a piece of grit on the gasket. Worth a try. Clean the gasket and close the lid. You will need to start and run the car 3 times IIRC before the fault will clear.