Four problems related to brake antilock control unit/module have been reported for the 2000 GMC Sierra. The most recently reported issues are listed below.
The abs turns on in my truck while coming to a slow stop causing the truck to not stop. I took upart my hubs, the front abs sensor has corrosion in it that puts it out by a few thousandths and it thinks it is going -5 mph and turns the abs on. This has almost caused several accidents for me as I have rolled right into several intersections when I expected my brakes to stop my truck. Luckily I was quick enough to use the ebrake each time until I could get a temp fix going. The problem is with the sensor, not the abs itself. I am not sure how to correct it, other than cleaning it regularly, so I disbaled my abs (pulling the fuse under the hood) to make it safe to drive the truck in the mean time until a resolution can be found.
While applying the brakes abs brake light appeared on the dashboard and remained on. This caused a loss of brake power. Consumer was able to maintain control of the vehicle, and drove it to the dealer for inspection. Mechanic determined that the brake pressure modulator valve was not functional, and needed to be replaced.
While pulling into traffic at 5 mph abs light came on and stayed on. Vehicle was taken to the dealer, who determined that the abs module needed replacement.
Abs brakes goto full release below 10 mph unable to stop.