One problem related to brake light has been reported for the 2007 GMC Envoy. The most recently reported issues are listed below.
I took my vehicle in for an oil change and the shop noticed that my brake lights did not work. I left the shop and decided to investigate the problem myself. After replacing all of the bulbs and discovering that the problem was elsewhere. I took the car to a dealership and they found that the problem existed under the dash, they determined that every time I braked, the wires were being stripped and caused a short.