Hi all - I am getting the "Traction Active" error message and subsequent ABS activation again on my 04 Burb. It mostly happens after a cold start on acceleration from a stop. I say again because it happened a few years ago. At the time I was able to correct it with new front wheel speed sensors. I now have a laptop based Tech 2 and I was just wondering if there is a way to isolate and/or test the sensors and determine if it is one of the fronts that has gone bad again or if I should be looking to replace the rear ones. TIA