I have about 53000 miles on my G6 and there is this noise that barely started, when I'm driving like around 25 and I let go of the accelerator I can here like a buzzing. It continues even if I press on the accelerator, it seems as if it is coming from the front. It sounds kind of like a remot control car, you know how they make like a sound every time they are being controlled, well that is the sound that my G6 is making any ideas?