I’ve been complain to Tesla since June 20 that I had a battery issue. Prior to June 20, I had 74kWh battery capacity under ver 8.1. My car was forcefully updated to ver 9, and my battery capacity started decreasing 1-2kWh each time I charged to it was 66kWh capacity about 3 weeks latter. I had the West Palm Beach FL service center and Rockville MD service center log into the matter and each said the logs show nothing and it’s normal degradation (which I didn’t buy).
I’m in the Boston MA area today and the car is dead with several warnings on the instrument cluster about the battery voltage being below normal, power being reduced, pull over immediately (kinda funny as I was trying to shift the car from park into drive), etc. Called Tesla 877 number and they told me the system shows I have a battery issue (not the 12 volt battery but the HV battery). They have arranged for a tow truck to get my car.
Morale, you know your car better than Tesla. Don’t take their word that there is nothing wrong with the battery if you suspect there is an issue.
Will update when I find out more. I hope I get a loaner car, I have medical appointments in Boston the next two days and need to be in FL on August 14 to see my son who is flying in from out of the country.