Not to panic. The low level means the coolant reservoir (the plastic container attached to radiator cap with a small hose) needs fluid added, You can add water or anti freeze. There is a max / min mark on it. The coolant will be drawn into the radiator as needed.
Check your fluids and see what level its at. If its low, then fill it with the same kind of Coolant which is Dexcool. It should then go out. If its full, check your sensers.