2016 Kenworth T800 ISX

Could be many things such as wiring, modules, or relays. On the t800 there should be a module under the driver side of the cab. That module controls the chassis lights and everything to do with the chassis. We one time had a problem where one of the plugs were not pressed in all the way and it gave us problems with tail lights and turn signals. Best thing to do would be to scan the truck to see if there are any codes. There is also another module under the cup holders in the center console. It controls everything in the cab. Has anything been messed with or removed? I would also look for any wire rubbing.

 

I’m having the same issue with a 2015 T800 Paccar it runs great for a couple of days then this message comes up in the dash circuit failure seek service immediately and my lights stop working and also engine won’t shut down any advise

 

The funny part is that if you leave it alone for a day or so the message goes away