Thanks, I appreciate the support. The 3 is stable at 270ish miles at 100% (just updated numbers in signature), which according to Tesla is normal degradation. I haven’t run the 3 below 10% since 2020 or so, when I did the last long roadtrip in that car. But this happened on the 2017 X100D, which until recently was our reliable roadtrip car. Theoretically, the BMS should be more accurate on this older X than the 3 because it doesn’t need to sleep that long to adjust….theoretically. I had Tesla look at it and they insisted everything was fine and literally said that I should never let it get below 10%.This is really bad. It usually indicates a failing battery of some form.
What vehicle type? Do you have some pictures?
Definitely very abnormal. It sounds like your BMS has no idea what is going on and Tesla will need to fix it. You have to make them go into the logs and figure out what happened at 6%.
Definitely completely unforgivable and not something that should happen. 6% is HUGE amounts of margin. It's not even close to an empty pack (it's about 10% left!). To put it in perspective, that's the amount of energy my Spark EV battery has in it when it is at around 40%, and can travel another 20-25 miles. (Yes, obviously it's a higher SOC & voltage for the Spark cells at that same energy content, which does matter.)
This is a serious issue. Definitely FORCE Tesla to look at it, go through the logs, and if necessary, replace your battery under warranty, if it is still under the mileage limit. This should NEVER happen. There's no excuse whatsoever for a failure like this. It's a warranty issue, for sure.
Unfortunately if you don't have documentation you may need to document another premature shutdown under controlled conditions. If nothing else this needs to be extensively documented within the valid warranty period just in case it fails out of warranty, so it can be covered under warranty outside of warranty.
Absolutely unforgivable. I note you have a P3D with 265 miles at 100%. This is absolutely massive capacity loss (20%!!!) and represents a pack that is really struggling and way outside the norm of capacity loss (my 2018 P3D is at ~292 miles). You do live in a warm climate and probably have kept the pack above 55% a lot.
This may be a contributing factor and your pack is probably on the verge of failure. It's a major safety issue. It's routine to rely on a pack to operate down to ~0%.
I took it to Tesla after the 3% shutdown (where I was planning on arriving at supercharger at 8%, but the estimate went down from 10% to 3% in a matter of minutes, see invoice attached…shut down happened less than a mile from the supercharger…had to push it to a gas station that was closed and plugged into the wall for 2 hours and then was able to limp it the last mile to the charger). Paid Tesla the $295 for the diagnostic just for them to tell me to not run it down to 3% and use the nav system (I was using the Nav system!!!). Called them after the 6% (spoke directly with service center tech), and they said the same thing. I don’t have any indication that they’re going to give me any different response so I’ll save myself the $295
Last edited: