The light on the 4wd switch is not coming on. The code on the scan tool is U0102 on 2013 GMC Sierra 2500 HD

What needs to be done. I am a tech in Ghana, there is no dealer out here. It is a Denali HD 2013 model 6.0l 6spd tranny, with only 5000 miles. Any help will be appreciated.

Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
2 answers
ALL DATA DOESN'T LIST UO102 CK AGAIN AND REPOST
2013, see dealer for warranty repair!