Originally Posted by ahlem

If you raise the vehicle, remove the rear wheel speed sensor put the vehicle in neutral and slowly rotate the back wheel with some fine sandpaper on a popsicle stick rubbing gently against the pick up surface, you may clean off the surface and solve the problem. We do a lot of fabrication and grinding in our driveway and when I had the same problem, I had picked up some metal filings on the speed sensor and pick up surface. Welcome to the rust belt. You can also get corrosion in there and get an interrupted signal. I chased this for an annoying length of time until I cleaned it.