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Showing results for tags 'itbc'.
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Recently purchased a 2009 GMC Sierra 2500 HD with the LMM motor. I hooked up a dump trailer yesterday that typically works on all of my other vehicles. The integrated trailer brake control doesn't seem to be working. The lights all function on the trailer as they should. But I have to cycle through the information in the DIC to pull up trailer brakes. The gain is stuck at 0.5 and cannot be adjusted. It is followed by a series of dashes. I have checked stud 2 and the Itcb fuses. And replaced the brake controller itself. I'm wondering if the master cylinder sensor would be my next stab at the problem. Or if anybody might have any suggestions.
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I have a 2007 Sierra 2500HD (K2500) Duramax. After the 'Service Trailer Brake System' DIC message appeared I changed the Controller and checked both fuses. The message persists. I am not able to find the ITBC on any of the schematics I have and not on the internet, either. Does anyone have one or can you point me to one?