I was driving on the road. The road naturally turned to the left, and when I turned the steering wheel, the truck did not turn. I hit three parked cars. The steering column steering shaft disconnected from the back of the steering wheel. There was no warning signs prior to the accident. I contacted GM. They sent out a adjuster. And denied my claim but did not give me a reason why. My safety was at risk because I lost my steering. The steering wheel turned but the steering shaft became disconnected from the back of the steering wheel and there was no steering. This is a huge safety concern. If this happens to other people. Some one will get killed. I have pictures of the defective part.