2007 Tahoe Electrical???

It just dyed on my wife today while she was on highway, I got there and with key turned over it would not start just click and the locks would go off and on. The messages of Stabilitrac and Service 4 wheel drive were flashing. I checked the battery connections and they were fine so I moved to the fuse box thats under the hood and pressed all the fuses down and it started dinging and it would finally start. I started to drive it and it lost all power on the insturment cluster and the locks were locking and unlocking. It had no power as I floored it and it never would down shift. Any suggestions???

Start at the battery.
Good battery and good voltage?
What is battery voltage?
Will it crank with a jumper?

Check battery cabels and ends both pos amd neg.
And battery ground to engine.
Then check for full 12 volt power to fuse box and power on both sides of fuses?
Has it got good full power to it and threw it ?
Also check for good 12 volts to starter.
Let us know what you find.

Took to the dealership and turns out it was the Transmission Control Module. Still under warranty and free. Would have never guessed that...

Yes.

Free is usually good.

You never know what it is untill you ckeck it out.
Thanks for posting back the fix and how it went.
Good luck