I hope far more than 100k miles. They have been working on the million mile main battery, so may be some of those improvements are there for you. At least 500k miles would be much better.
Sorry to see that but yes, you should drop it off at the service center immediately. It should be covered under warranty. They can give you a free rental Tesla too.
I would guess that they misdiagnosed your problem.
Would a bad 12V battery trigger this message? And reduce the range and charge level?
After reminding them that the 12V was replaced in August, they removed the line item. Now, it's just the HV.
My only warning was "Maximum battery charge level reduced". I was surprised that they wanted to replace the 12V because it was the last service performed at the same SC. I got the "Schedule service. Low voltage battery needs replacing" warning in August 2022 and that's when I replaced it. (They also tried to charge me for 2 hours of labor to fix the passenger airbag light, which turned off a few days later.)
The 12V battery voltage is only telling you current state of charge, not capacity. Even a very worn out SLA will charge to nearly 13V, but it will have high internal resistance and very little capacity. The car is measuring charge/discharge Wh to determine the 12V condition.
It's pretty easy for a dual motor car to just pull the 12V and do a capacity check and replace if needed. My car sits a lot, so I do it every two years, and the old battery gets used for off grid solar.
Every two years. First replacement in was to a 3yo battery installed by prior owner.
Of course not. Modifications don't in and of themselves void your warranty. They can make it voidable but that's a very important distinction in the world of law. The onus is on the manufacturer to prove that your modification directly caused the damage to be able to deny warranty coverage per the Magnuson-Moss Act. This bit of legislation protects all of us consumers against frivolous warranty denials by the manufacturer. Too many people these days don't understand that very important consumer protection that was put in place nearly 50 years ago. I see people all the time throwing out "that will void your warranty" on car motorcycle forums and then people just start to take it as fact. Simply modifying your vehicle doesn't automatically void your warranty let alone basic maintenance items like replaced wear items and your 12v battery. Of course you changing out your own 12v battery isn't going to void your CPO warranty.
