Two of our work trucks have the same problem randomly the dash will show a code for the trailer controller problem. And when your towing and it does it you loose your brakes for the trailer has anyone else ran into this? If so whats the fix? Its scary droppin down i hill with heavy equipment on the back without trailer brakes

 

Typically when I see this, it's an issue on the trailer, not the truck. Are you using the same trailer when these two different trucks have this issue?

 

We use lots of trailers and it does it with them all. It flashes the code all day without the trailer even hooked up. Just randomly it said tbs fault

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Different trucks have no problems with the trailers at all

 

Read here...

Seems like you need to check your #12 fuse...

TBC Fault code?? - Ford Powerstroke Diesel Forum