2015 Prostar, the digital in cab scale used to be within 300lbs of actual weight on the drives, but now it's stuck reading 500 lbs, loaded or empty. I did recently replace the leveling valve, but that shouldn't have anything to do with it. I haven't tried disconnecting the batteries for 20 min to reset the system, but I don't know if that'd work either. Where exactly is the sensor at so I can verify it's condition? Thanks for any help y'all can offer!