2021 Tahoe Z71 disabled after software update

[mtcatgriz]

Be aware of system updates! My Tahoe prompted an update on 12/15/2022. I allowed the install to happen because I have done previous updates without any issue. The car was sitting at my office parking lot in a safe location. Around lunch time I returned to my car to run some errands. When I attempted to start my vehicle... nothing. No power. I called my husband & he just assumed a dead battery. He arrived to try to jump start it without success. We called Chevy Roadside Assistance for a tow. The 1st driver, attempted to jump start it and he was also unsuccessful. He was unable to tow the vehicle because there was no way to put the car in neutral without dragging it. The 'gearshift' is the electronic buttons. No power means we can't shift the car into neutral. We cancelled his services and requested another driver that could lift the vehicle & roll it (aka a Repo Truck). It was towed to the dealership where it has sat for over a week. They have also tried jump starting it. Also, we are being told there's a tool to 'unlock the transmission to be able to put the car in neutral & move it into the shop". The dealership says they only have 1 key and it's currently stuck in another vehicle. I love my Tahoe, and this is the first issue I have experienced with it. We purchased it Oct 2020. I'm beginning to fear that this is a bigger issue than just disconnecting the battery & resetting it. I have tried researching this issue online but can only fine experiences where the car was still drivable. My car is a completely disabled. I can't even lock the passenger door due to no power. Battery tests show that I have full power on the battery. Why is my car dead?!

 

[mtcatgriz]

Same problem. But I updated software in Wyoming. Don’t ever do that! I watched it update. It said it was good to go but it drove funny…. Then the electronic stability light went on, then it went off, then the engine started running rough, then it would not shift, then the breaks got touchy! I took it to the closest dealer because I was afraid to drive it very far. They hope to look at it within a week. Cheesy Fries!