It shifted into 4 wheel low on its own.
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When we stop and shut it off and start it again it shifts to 4WH D again
It has been at the Dealer for over a Month they can not figure it out. Even the GM Certified Mech...
where the radio and ac/heat controls are located but they are sporadic throughout not all on the ...
replaced ATC module and unit still starts off on AC and after a minute reverts to the HOT defrost...