WOW. Thats a new one. I know a lot of truckers have had problems with the factory nav system. Replacing it with another OEM unit is not the olny option. We sell a lot of the SmartNav harness so they can use a standard Din radio back in place of the factory PACCAR version. You will loose your monitor function. With the amount of issues Kenworth and Pete drivers are having mabe this a a warning to get rid of the system.