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Without checking the release notes for your Tuner version, my 1st step would be to check the IWE system on the truck.
There is a good thread in the Technical Articles / How-To forum on IWE operation.
Checking for a vac leak is what I am thinking, just as a SWAG. I have not seen this one posted in the Electrical Forum, so maybe a search in the 2004-2008 Forum and the Transmission forum also might be a good idea.
The 4x4 light problems in this forum as centered around the 1997-2003 problems, focus on the 1997-1998 MYs, and it is usually a vac leak, or mechanical problem. I do not know if my correlation from the 1997-2003 MY issues would cross to your MY range, but that is where I am developing the SWAG from.
Take it for what it is worth.
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