2013 GMC Sierra 2500 HD Q&A

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

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. -
Answer 1
ALL DATA DOESN'T LIST UO102 CK AGAIN AND REPOST -
Answer 2
2013, see dealer for warranty repair! -