One problem related to brake antilock control unit/module has been reported for the 2001 GMC Sierra 2500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 GMC Sierra 2500 based on all problems reported for the 2001 Sierra 2500.
Driving down road heard noise coming from under driver's side of passenger compartment. Noise was coming from abs unit would not stop even when ignition switched off. Can only stop by unplugging abs unit abs brakes don't work. Bad on icy roads.