A couple of weeks ago, my son had to replace the front wheel bearings on his K3500. I grabbed the sensors off of the old ones, and put them on my 2500, which was giving me a code for the left front wheel sensor, as well as one for the control module. Seems to have solved the problem. Thanks to all who took the time to read and respond. Also did the brake lines. Was'nt too far off from a failure. I was able to snap off the rear one and the right front one to get them out easier.
2001 Silverado K2500 HD 4x4 ext cab, Short bed 6.6 D'Max 2" lift Rock stock Full synthetics.