I have a 2004 Grand Prix GTP Comp G with 55k. I haven't even solved the other problem I posted on a previous thread and I already have a new one. So it usually happens at low speeds when turning the steering wheel. While turning the steering wheel I can feel a bumping feeling. I then can hear what sounds like the rotor/hub assembly rotating from the front of the vehicle. Then on the DIC says "Service ABS, Traction Control, and Stability Control". It then shuts off my traction control (I can't turn it back on) and the ABS light stays on. I can shut the car off and the lights go away. When i start going again and I turn they come back on. It has been getting worse and more frequent. I have replaced both front hub assembly's so I am wondering if maybe my speed sensor is bad? The other thing I was thinking is maybe there is a brake sticking. Any thoughts would be appreciated, thanks.