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service trailer brakes

  1. Service Trailer Break system

    Towing & Hauling
    I’ve got a 2010 duramax and every time I start my truck it says service trailer break system. But when I hook my trailer up and start my truck with my foot on the break it comes across the dash saying “trailer connected” and the trailer breaks work fine until I take my foot all the way off the...
  2. Problems with EFI Live Tunes?

    EFI Live
    I just posted this same thread over on the EFI Live forums, but thought I would post here too so hopefully I can get some answers quicker. Alright this might be a little lengthy, but I want to be thorough explaining everything so I can hopefully figure out whats wrong. I am working with two...