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I have recently acquired a 2008 LMM dually and the integrated trailer brakes are not functioning. I have no fault message, which is what most of the research I have found says occurs when they are not functioning and I am able to adjust the gain on the brakes but when connected to the trailer, I have no output. I am not very skilled at tracking these types of issues down so I am looking into some insight. I have purchased the relay that is under the spare tire but have not replaced that as of yet, plan on that this evening. No wires I can see in the back near the trailer connector have been cut or spliced but I did find an old brake controller stuffed under the drivers side dash but the wires to it were not connected. Any insight would be appreciated. Thanks in advance.
 

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Heard plenty of complaints on the initial ITB controller... My 2013 didn't work... I bypassed it w a Prodigy P3... Not entirely uncommon...

Easy and simple... Instructions and videos on youtube or E trailer.com
 

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It could be a bad trailer Brake Control Relay, which is located above the spare tire on the drivers side of the frame. A relatively common, known issue.

Id certainly check that before I bought an after market controller.

$29 at Rock................https://www.rockauto.com/en/moreinfo.php?pk=2457832&cc=1441214&jsn=823

Also, since you just recently got the truck, this thread may be of interest and help:

https://www.duramaxforum.com/forum/maintenance/988217-maintenance-info-suggestions-new-owners.html
 
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