i would try replacing the 4 wheel drive switch. They are common to go out, it might look like its working.. flashing and all but really is doing nuttin. Do you have any abs lights on? wheel speed sensor codes and EBCM problems also will not allow the truck to go into 4 dig. let us know.
mmm.. i looked under some bulletins under SI. I see a couple bulletins... one stands out.. as you say you hit a bump it comes on? This could be caused by a loose, missing, or broken Connector Position Assurance (CPA) retainer at the Air Bag. Make sure you tell them when you hit a bump or rough roads.. sry i cant do anymore.. im not there lookin at it!
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