2008 GMC ENVOY electrical problem
Have not heard of this problem but I would keep pressing the dealership, sounds like a possible problem with the BCM, which they may have a "flash" for once more people report it.
What problems? Brake lights flickering?
I've worked on a few of these, and most of the time it's because of the relay. It could also be a short in the wiring, I would go to a dealership or a collision shop and have them check all of your wires for a short.
Looking for a Used Envoy in your area?
CarGurus has 2,073 nationwide Envoy listings starting at $2,499.
Search GMC Envoy Questions
GMC Envoy Experts