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.
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