Model S sends all BMS voltages out on CAN. You can see if all the cell strings are still ok. Clearly there is also something wrong with the contactors, which is probably why it sat.
Early S/X packs are generally ok to sit a few years and still have acceptable charge, not so with the newer packs that have higher self-draw. On Wed, Aug 13, 2025 at 1:20 AM Bryce Nesbitt via EV <[email protected]> wrote: > Hm. > Looking at a Tesla Model S Performance that was abandoned, towed, > stored, and not > cared for. The batteries ended up all flat. 2021 Model S Performance > with 40,000 miles. > The vehicle is in San Carlos CA > > A Tesla dealer says this is not covered by warranty, and repair cost > is $40,000 (note that's $1/mile). > > Poking at the thing after cobbling together a new 12V battery shows > "Contactor power failure detected. See Toolbox Article 44497". > > https://teslamotorsclub.com/tmc/posts/7947897/ > > > Thought tips or pointers on this situation? Who can objectively > analyze that battery and > determine if it's a contactor failure or the actual cells? > _______________________________________________ > Address messages to [email protected] > No other addresses in TO and CC fields > HELP: http://www.evdl.org/help/ > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20250813/0726d612/attachment.htm> _______________________________________________ Address messages to [email protected] No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
