Received the “rear motor disabled” notification on my new 2023 Model Y (850 miles) while driving <30mph. Felt a small jerk before the notification came up. Other notifications indicated the vehicle speed would be limited to 68mph, then changed to 37mph, and advised not to drive on steep inclines. I called Tesla Service, and they arranged for a tow to a service station and an Uber ride home. Happy with the service support but very disappointed to have such a problem with a new vehicle. Hoping the repair can be done quickly, and that this is the last issue for some time.