I picked up my 22 3500 w/TTPMS and UC5 back in July, installed the sensors on our 35' 5th wheel tires, and configured/registered the sensors per the instructions in the manual. Did not have any issues with the procedure. This was with the original S23.13 software.Until the last update 24.17, you could not set the trailer tire pressure target. It would keep returning to “409”.
Then, when you registered the trailer tires, they would all display normally until you shut the truck off. Upon restarting, you would get the message “Trailer Tire System Not Configured” and nothing you could do would bring it back. The UC5 would not store the config.
The following weekend we headed out on our first camping trip with the new truck and I too noticed that at first, the TTPMS would say “Trailer Tire System Not Configured" when I started the truck and drove off.
But after a few miles, I switched the display back to trailer tires and all the pressures were there and increasing as the tires heated up.
Since then I've noticed that this is the norm after I turn the ign off and sit still for a few minutes (like when stopping for fuel, etc...).
Don't know if this makes sense but it seems like you have to wait for the sensors to "wake up" before they start transmitting a signal.
We've been camping with the trailer several times since and have not had any issues as long as I give it time to re-connect on its own.
Last month I got an OTA update to 26.17 just before our last camping trip, and the TTPMS has been working the same as before.
Last edited: