Three problems related to brake light on have been reported for the 2005 GMC Envoy. The most recently reported issues are listed below.
Brake lights stopped working; the light bulbs work, but when you push in the breaks neither back brake lights come on. The only working break light is the middle top one. This is very dangerous.
Tl- the contact owns a 2005 GMC Envoy denali xl. The contact stated abs and service brakes light illuminated on her instrumental panel. The contact took her vehicle to an independent mechanic. The mechanic stated the ebcm would need to be replaced however, only an authorized dealer would be able to perform the repairs and because a system update would need to be reformed as well. The vehicle was taken to an authorized GMC dealership. The dealer stated the part was on national back order and it would be unknown how long it would take reproduce the part needed. The vehicle was not repaired. The failure mileage was 100,000. The current mileage was 123,000. Az.
Abs and brake warning light comes on and off. Dealer said it was a bad brake module. And would not cover under warranty.