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I don't know if the issue is similar, but I used to have a "trailer disconnected" message and had no trailer brakes. Took my 2008 GMC to the dealer and they found that the front brake sensor was causing the problem. After they found the problem and I assume they cleaned or did soemthing with the sensor (they didn't replace it) I haven't had a problem since.
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DPAM
2017 GMC Denali diesel, crewcab, 4x4, regular box.
2010 Montana 3150RL- Moving to Montana Package , Hickory Edition Package, wet bolts
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