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Service 4WD Message and Technical Service Bulletin N152028770 and why isnt my 1500 Denali listed?

Jim Dawson
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Jim Dawson New Member

Jim Dawson

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Re: Service 4WD Message and truck stuck in 4WD: This is a frequent issue which my local dealership didn't see listed for my 2016 Sierra Denali (6.2l).  Service department says I'll have to leave the truck with them all day.  The aforementioned TSB describes my issues perfectly, so I get suspicious and go to my local garage with a chocolate milkshake for buddy who comes out to clear the codes.  Well doesn't my truck immediately shift into 2WD, issue solved (unless I want 4wd auto, which I never will again).

 

GM should include my truck on the TSB in my mind.  Apparently the issue is software and requires TCCM reprogramming to permanently fix it.  I'm just glad I didn't get ripped for 6 or more hours of fruitless searching at my Lindsay ON dealership.

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