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



KWAMENA, 6.0L V8, Atlantic, VA, August 19, 2013, 16:20

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.

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