Good day Sir, I recently bought a 2025 GMC 2500HD Deisel. I am having trouble with the same issue with trailer brake module shutting down. The dealership replaced the module but it's still not working. Turns on then off when hooked up to my fifth wheel. They now sat GM is saying for dealership to change out both plugs and hook up their trailer load test kit. This is happening on Wednesday. Do you have any other ideas to fix this issue? Did your issue get resolved after the new module was pit in? Thank you, Louis
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