Hill Descent Control 2016 GMC Sierra 5.3

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Question? Does anybody know if it's possible to add "Hill Descent Control" on 4 x 4 trucks that didn't come with it from the factory that have cruise control. I know it would require the correct stability control switch GM P/N 23145106 bank adding the Hill Descent Control button applicable with the options on my truck. When pushed this button simply applies a ground to the body control module so must be an RS flipflop logic switch. When I hook up my bi-directional scanner and activate all instrument cluster lights the "Hill Descent Control" light illuminates in the cluster. I'm going to assume for the system to function the Body Control Module would have to be reflashed opening up the "Hill Descent" system but??? Anybody