One problem related to brake light on has been reported for the 2005 GMC Sierra 2500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 GMC Sierra 2500 based on all problems reported for the 2005 Sierra 2500.
Driving through an intersection at 40 when a another vehicle made a left turn in front of me . I applied my brakes and pedal went to the floor . I swerved and avoided the on coming vehicle . The rear hard steel brake line above the fuel tank burst due to corrosion . No warning no fluid or brake light just a catastrophe failure of line. Upon inspection line is not corroded on the frame rail before the fuel tank just behind the tank.