Originally Posted by rmaier

First and easiest fix is to re-seat the 44 pin connector on the ABS module itself. Mine had a bad connect and threw no code but the ESP/BAS light was on with no code so I replaced all 4 sensors and I even replaced the brake fluid sensor along with some other brake related stuff to no avail. I was about to give up when I was messing with the large wire harness on the ABS itself and just for grins removed and re-seated the whole wire connector and that finally fixed my ABS problem the lights went out on the dash and the light in my head came on! I spent 4 months looking for that fix and it was as easy as re-seating the connector. I had never messed with it but it somehow wiggled loose or got disconnected enough to cause a problem. I still don't know why it didn't throw a code but was happy it was finally fixed.