Trenton
Just a Texan transplanted in the Rockies
@kennythewelder is correct. The GMT400 trucks are indeed prone to having bad boards. In fact when mine went out on my old truck, it causes the reverse lights to come on when I braked, flicker between the reverse/tail light when the blinker was on, and the tailights would go off when I pressed the brakes. Haha, good 'ol broke high school days lol. You can buy them at practically any auto parts store and you only need a 1/4" socket and a Philips to change them.
