I am having this (or at least an extremely similar) issue with my 2005 Avalanche 1500 LT 4x4: ABS, Airbag, and Battery lights lit; Fuel, Transmission Temperature, Engine Temp, Oil Pressure, and Alternator gauges dead (Speedometer and Tachometer, are good); 4x4 indicator lights, power windows, power locks, remote keyless entry, power mirrors, chime, dome lights, stereo/nav, and A/C (fan okay, no cold). Truck so far runs fine. Oddly, this just suddenly happened when I started the truck to move it yesterday. Battery was nearly drained but had enough to start the truck. Not too surprising as it hadn't been driven for 2 weeks but the battery is only a year old. This seems to be a common enough problem with this and similar vehicles, but nobody (on the web) seems to be in agreement as to the cause. I've seen "bad ground", "data buss issue", and "ignition switch" primarily. TBH, ignition switch issue of some sort seems to make the most sense. Unfortunately, I don't have or have access to diagnosis equipment at this time so I'm taking it to the dealer tomorrow. Will report here on what they come up with.
Edit: Tried to start this morning and the battery is completely drained which leads me to believe there is a short of some sort.
Monday, December 27th, 2021 AT 10:50 AM