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4WD Not working

M.A.

Member
Nov 29, 2019
44
7
Truck Year
2018
Hello and Happy New Year for everyone,
Just took my 2018, 45k miles eco diesel to a snowy road and needed to activate the 4WD but came to my surprise that pushing the buttons will only flash not engaging and shortly after a message that state Service 4WD appear on the dash. Somehow after many tries switching to neutral, parking, driving it looked on 4WD high. Of course it gives me same headache to switch back to 2WD. Scanned with Auto Link it bring up two codes from the Control Module, $7E8 and E9. I unplugged and plugged back all connections from the transfer case, front differential, find nothing wrong, still no fix.
Has anyone come across this issues with their eco diesel?
Thanks
 
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