Irvine Toyota called me yesterday afternoon and announced my car was ready for pickup. Code found after reviewing the "freeze frame" data was U1146 "Lost communication with electric propulsion control system gateway." Contact with Toyota Engineering had revealed an ECU update was available from Tesla and they performed the update. I asked the service advisor to confirm the firmware version and place it on the paperwork. He later said the tech did not know (it was not stamped on the file) and did not know how to find out. I didn't push the issue as I just wanted to take the car back. I also checked today and found no sticker under the hood as others have seen after the update. Since I can't confirm this is the 1.3.62 update I'll assume that for now.
It seems to be pretty clear that the EV technicians at Irvine Toyota are not as well trained as others in SoCal.
I'm in a wait-and-see mode until the next time the warning message appears.
Is there a history of the firmware update alone fixing issues or can I expect a hardware failure in the future?
Thanks,
Tim