Just came on today, didn't overheat or anything. I checked my antifreeze just now and it is filled to the neck of the radiator? Anyone know what could cause this?

 

It's a pretty common issue. The low coolant level sensor is either dirty or bad. It's located on the passenger side of the radiator, and it is of square shape.

Take it out, clean it and see if the problem persists. You will most likely need a new one... or just leave the connector disconnected (like I did) and the light will go away.

 

Awesome. Thanks for the help. Sure did freak me out when I was driving on the interstate and I noticed it was on.....