The contact owns a 2018 Toyota C-HR. The contact stated while driving at an undisclosed speed, the contact heard a loud pitch whining sound while attempting to shift gears. There was no warning light illuminated. The contact stated the vehicle vibrated when the contact came to a complete stop. The vehicle was taken to the dealer where it was diagnosed that the transmission had failed and needed to be replaced. The vehicle was not repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 84,000.