2015 Charger U0101 Code. Car will not completely shut off

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Had this happen to my daughters 2015 Charger SXT AWD after change over and installing new snow tires on her car. She picked the car up from the dealer and drove about 1 - 2 miles up the road and pulled into a shopping mall to have dinner. Placed the shifter in park and pushed the On/Off button. Car shut the motor off, but would not shut the dash and electrical system down. Dash message center had error message to place transmission in park. Tried rattling shifter around hoping it was stuck parking switch. No change. Popped the hood and checked fuse in box for AWD module. No issues found. Disconnected power going into fuse box at side connector for jumping the car. Still had power to dash and systems. Tried dash and FOB buttons to open the truck and get to the battery. Because car thought the shifter was in drive, it would not allow trunk to be opened. Plugged in code reader and had a U0101 Generic loss of communication with TCM (Transmission). Had car towed back to dealer. They had to