I have a 2008 suburban, 6.0/1500/LTZ.

We just bought this suburban, and have about 100 miles on it. 65,000 miles on it. Just drove to the store and the "service suspension system", "service backup camera", service engine light all came on. The speedo and tach went crazy and didn't work right and the transmission started shifting really hard. Before this there we no problems at all.

I plugged in my DIY tester and got codes P069E, P1174, P0700, U0073, U0109 and U0100. I'm a pretty good mechanic, but not electrician. I suspect all of this point to one singular Control Module, or something. Any thoughts out there? Thanks a lot for any advice you can give. I appreciate the help!

 

Welcome to the forum...
It could be something expensive and complicated, but I'd start with the basics...
make sure your battery connections are clean and solid and that the battery is in good condition of charge... check the ground strap from the engine to the body/frame....
Write down the codes, clear them and see what comes back....