One problem related to brake light on has been reported for the 2005 GMC Sierra 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 GMC Sierra 1500 based on all problems reported for the 2005 Sierra 1500.
When pulling in my driveway the brake lights came on and the brake pedal went clear to the floor. Upon investigating I found the brake lines to be severely corroded. I was fortunate not to be driving at a faster rate of speed on the open road. That same week the steering had become very difficult to turn like it was low on fluid, which it was not. I have also had to have both front wheel bearings replaced along with the computer at 400 miles.