Coffee was spilled on center console while transferring cup from Starbucks employee to cup holder. Cup was overfilled and lid wasn’t on properly. Immediately the dash panel started flashing and the service transmission light came on. Drove around a parking lot for a few minutes and seemed okay to drive even with the instrument panel flashing. Had 90 mile drive and during drive message similar to slow down for gear shift popped up and “Service Shifter See Owner’s Manual” came up. When I went to exit freeway and was around 5 MPH the vehicle slammed to a stop. Then would not go into any other gear. As I called for tow driver I turned vehicle back on and was sitting when the vehicle started moving again without my control. I then drove it an additional 20 miles home staying above 20 MPH. Insane Cadillac would design a $120k vehicle with that risk in a very susceptible to spills area. Incredibly unsafe. Beyond traumatizing experience with a vehicle that has leas than 8500 miles on it.