I've notice this noise now for a while.. I think it sounds like a loose belt,maybe atensioner gone bad. It's from the front of the engine around the belt area. I only notice it when I give the car gas. The sound speeds up when the motor speeds up. It goes away when the car is warm.
I know on my Yukon it eats tensioners like candy. I was just wondering if any one else has had this kind ofissue on a CTS.. Thanks