sorry guys I posted this in general tech before realizing it belongs here so here it is
hey guys new member here and need some help with the wife’s Yukon Denali so here’s the deal right now it has an intermittent no crank(run through a few on off cycles it eventually starts) when it does start gauges bounce, speedometer does not move at all, and the gear indicator does not show current gear selected, when driving vehicle does not shift, and the rear hatch and window do not open. Attempted to hook a scanner to it and it will not communicate (it gets power and turns on) checked Fuses (under hood and passanger compartment) all are good. Looking for a good starting point for diagnosis or some schematics if at all possible, Thanks in advance