Why is this warning about ?
Do you have a tow package? It's for towing a trailer that has brakes which are activated when you touch your brakes. Like a camper trailer with electrically activated brakes. I'm only guessing here. My dad had one in his Yukon for towing his 32' camper. Found this link also.......... http://www.duramaxforum.com/forum/gauges-electronics- wiring/120320-itbc-service-trailer-brake-system-resolution.html
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