2018 C63S "Service Required Do Not Shift Gears Visit Dealer" FULL Battery. TS Help

I have ZERO power in the car unless I hook up a battery to the jump points in the engine (Picture 1). Side note: why would someone remove this entire panel and the air box inlet?
The battery shows 12V, and I tested it past the pyro-fuse, and it also shows 12V. Is there something else I can check?
The error messages on the dash after I hook a battery to the jump:
1. Service Required Do Not Shift Gears Visit Dealer
2. Parking Pilot Inoperative
3. ABS/Traction control Inoperative See Operator's Manual
4. Power Steering Malfunction See Operator's Manual
5. Suspension Malfunction See Operator's Manual
Thank you to anyone who can offer some tips that I can try. It's huge to get the car able to move around the garage.
Picture 1
Picture 2
Picture 3
Last edited by BinkyTheToaster; Oct 8, 2022 at 08:48 PM. Reason: clairity



