I have a 2005 GTP. When I go over bumps and sometimes while turning I can feel and hear rattling in my steering. It sounds and feels like something is loose. It has been getting much worse over the past few weeks. I took it in to a service garage and was told my suspension was all tight and nothing was wrong. The only thing they noted was a slight creaking when I turn the wheel which they claim is an unfixable GM defect. Any input?