'02 GT traction Control Problems

I have a '02 Mustang GT with 53000 miles and auto trans. The problem I am having is the traction control system is not working nor does the cruise control. The button that turns off the t.c. stays on all the time and just recently the wheel slipage light under the speedo has started comming on and going off. A local repair shop tried to scan for codes but thier computer would not communicate with the system. Just wondering if anyone has heard of this before.