I have a 2008 G6 and was told a while back by an oil change facility that my tie rod and control arm with ball joint needed to be replaced on my car. I called a local Buick/GMC dealership today and was told by the service department that it may not be the whole tie rod needs replacing, but rather another component like the CV joint or a torn boot, but of course I would need to bring it in for a diagnostic. I have noticed a similar 'clunking' sound as others have noted, and also check power steering shows up occasionally in my radio display, usually upon starting up the car, but as soon as I turn the wheel slightly one way or another, the warning goes away. I had the same problem as others with the power steering going out on me, took it in about a year or so ago because I found information about the Service Notice and they took care of that, and it hasn't frozen up anymore since. Car has 76k miles on it. Since I'm a female who knows very little about cars I'm just trying to do some homework about any potential TSB's or Service Notices, etc...before I take it in so I can at least sound like I know what I'm talking about a little, and in case I can get something repaired/replaced at no charge.