I had my tailgate down on my 2017 Chevrolet Silverado (hauling lumber) and I didn't know to turn off my Park Assist when tailgate is down. Now when I start my truck the Park Assist will come on and stay on for a little while; then I get the message "Park Assist Blocked see Owners Manual" and it's not working. There's nothing in the manual to let me know what to do. Does anyone know how to reset the Park Assist so I can get it working again?