I have a 99 GMC 2500 "new body style" yesterday the ABS system started to malfunction. It sound like an electric motor vibration coming from the unit mounted on the frame rail under drivers floor. I spoke to a friend of mine who said GM is having lots of problems with this system, and they should cover the repair enen out of warrenty. The truck has 42000 miles. I just would like to know if anyone else has had similar problems with this or any part of the ABS on these trucks, before I yell too much.