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Just got my first new truck, 18, Silverado 1500. The parking assist was working fine (set to on with tow-bar) and i towed my camper for the first time last week. I turned it off with the button (not the dash computer) and now it wont turn back on. When i start my truck it automatically says Park Assist Disabled. My tow mirrors are in (don't know if there is a sensor in them or not). I have disabled and re enabled and nothing, the switch on the dash will not do anything.  Any help would be appreciated. 

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