Service traveler Brake system

I want to think everyone for their help lots of knowledge here I have an appointment on Wednesday at the GM dealer I need to get this looked after I am leaving on 8 December for Texas and I do not want any problems once again thank you all

I strongly recommend that you take your truck to a dealer, where they can plug in their computer and determine where the fault lies.
Long-distance diagnosis is very difficult at best, and you will probably not find your answer on any internet forum. There are simply too many possible gremlins in any electronic system; even people who have had the identical problem may not have an answer that applies to YOUR specific truck!
good luck.

I need to find out what this means we are getting ready to leave here in Ontario to head to Texas on 8 December

GOOGLE SEARCH took me to this forum discussion of the same problem..

Maybe it will be of some help for you...

SERVICE TRAILER BRAKE MESSAGE

Roy Ken

just with the truck

Sounds like your trailer brakes system is getting a fault. Are you connected or is this just with the truck