One problem related to brake warning switch has been reported for the 2000 GMC Sonoma. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2000 GMC Sonoma based on all problems reported for the 2000 Sonoma.
When traveling at highway speeds abs light comes on, and brake light on dash blinks although brakes are not being applied. Brake light will stop blinking if vehicle is slowed down, but the abs light will stay on until key is taken from ignition. Dealer has seen vehicle 3-4 times, and can not fix it.