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  1. Duramax Third Generation: 2006-2007.5 (LBZ & LLY)
    I am hoping this post will help others avoid my 7 weeks of frustration and $1200 in parts I did not need. The DIC flashed "Service 4WD" and the error message went away. I kept driving the truck for about a week. Then "Service 4WD" stayed on. I read online about cleaning the grounds on the...
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