4x4 not switching over

Vic3v3

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Joined
Apr 23, 2026
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1
Location
TX
Just Bought 06 Yukon when I press the button you can here transmission but it doesnt stay on light flashes then goes back off. Like 3 days ago I'm not sure what I did different but it stayed it auto 4wd. It worked like that most the day then went off again haven't been able go get it to stay on now
 
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My girl's AWD capable 2002 TrailBlazer, all of a sudden would not do anything but 2wd. Research here and thru the smarts of the members and past threads, saw that the module was a knwn weak spot. Got a newly reprogrammed one and installed and all is good.

Your problem is slightly different but could be the module but my thoughts lean toward the encoder. Or some dirty connections.

Welcome to the forum, from Oregon, by the way.

If you decide on a module, let me know and I can hook you up with a very fair and knowledgeable guy at ebay.
 

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