I got my scan tool today. I registered it and went out to my 2008 Cadillac CTS connected the scanner and ran the DTC to find that my rear right wheel speed sensor circuit is open or shorted. I clear the fault the traction control light and ABS went off. I then drove the car light came back on. I again scanned and again got the same code, reset and save the data to memory card. I then clear the code, next morning wife drove car and again traction control and abs came on. I then connected the scanner and ran a DTC it communicated but it tells me no codes as if all is find!