Could be that the wire for the ⅔ sensor got knocked off or was never put on. Could be bad sensor.
Don't let it disrupt your Summer camping fun! It's a 2017, so start a list of "little things" that need fixing, and at the end of the season take it in for the list of warranty repairs for the dealer to make.
Be Safe, and Everyone Goes a Home,
2014 RAM Laramie 2500 w/6.7L Cummins Diesel and Automated Safety Hitch
2016 377RLBH Jayco North Point
300W of Suntech Solar w/Rogue MPPT Controller & Xantrex 2000W PSW Inverter