Been troubled by my Abs system kept sending a wheel speed sensor code so I replaced both front wheel hubs it lasted for about 40 minutes then it re appeared but with a new code Co228 Abs pump tested it with my power probe and both the hot red wire and the black were showing ground and when I hit positive on the probe and the Abs positive side on the pump and it runs. Thinking I might have fixed it put it back together and again it trips the same code. I would appreciate any help my though it the Aas pump but I thought that the first seven times any help would be very much appreciated.