Random service stabilitrak message, service trailer brake system, service 4WD, turn signal on right after turning on, transmission jerky and hard shifting, cruise control disengage, dashboard needles going crazy, no power.
Finaly fixed! What it was? The big wire harness and connector right on top of the turbo pipe. The heat from the pipe cause the failure and short circuit inside the connector. Picture of the bad part attached.
If you having this issues with your truck, check the connector. Shake the connector with the truck park and engine running and see if the random errors appear on the dash board.
The fix is not easy, I wasted a lot of time with the dealerships and took it to diesel repair shop and they figured out in 5 minutes. Don't waste your time with the dealer they are just retarded. I heard all can of BS from the dealer from can't replicate the issue to software updates but never solved the problem.
My truck:
2015 Silverado 3500 HD, Duramax 6.6 diesel.
I hope this help somebody, I'm not sure if this the problem what everybody on this post is having but in my case it was.