For the past couple of months my ABS light has been turning on and off while driving. Last weekend I took it to the dealership to get the code scanned and it did not find anything in the computer memory. The light will turn on after about five minutes of driving and stay on for about ten minutes then turn back off. Sometimes it will come on as soon as I start my car and turn off after driving a while. Any thoughts as to what could be setting off the code?