Not sure you have the same problem, but symptoms are the same. My 09 duramax kept giving same message, ultimately dealer replaced the trailer fuse. Solved for awhile then came back. After numerous diagnostics by Chevy and my RV dealer, discovered that the brake wire which runs through the center of the axle was shorting out against the axle since the insulation had been worn through. Only occurred intermittently since wires only shorted when hit a bump. RV dealer ran brake wires outside the axles so they can be inspected. Problem has never reoccurred.
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2014 Montana Mountaineer 331 RLT. Winneguard SWM Traveler Satellite Antenna, Progressive 50 amp portable EMS, 6 point Level Up.. 2016 Chevy 3500 Duramax Dually, long bed, B&W Patriot hitch.
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