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i have a 08 silverado2500.. the DIC says service trailer brake system and when i get to the "Trailer Gain" DIC controll option it is stuck at 4.0 i cant increase or decrease it with the control module above the E-brake lever. Any input would be greatly appreciated!
 

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If it says service, unplug the cable, make sure it's not dirty in both cable head and plug, and then make sure its plugged in securely. First time I hooked up a trailer, I had the same problem and it was cuz the cable wasn't pushed far enough into the plug.
 

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Sorry. That's the extent of my current knowledge on the trailer/brake wiring system. I haven't had a need to dig into it, so I got nothin else for ya.
 

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Lift it off the truck and really clean the ball with a wire wheel or something. I got the same warning and hand a new ball laying around, just changed it out and worked fine ever since.
 
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