I bought a used Tesla Model S P85 2014 with 135k miles in July. It has been so much fun! Last night, I drove 20 miles to my house, and as I was pulling into my house, it came up with a warning.. I can't remember exactly what it said, but something about "may not restart".

I pull into my garage, plug it in and go to sleep. I woke up this morning to use it, and the screen tried to turn on but then shut off...

I googled and figured out how to do a "soft reset" (hold steering wheels plus brake for up to 2 minutes), nothing. Something about a 4 finger wheel reset (2 on wheels, 2 buttons above and hold brake). Nothing.

I tried doing a hard reset... Which is disconnecting the 12v battery, waiting 2+ minutes, then reconnecting it.

I got the screens to turn on, and enough to grab error codes, but after about 60 seconds... It goes back to shutting off.

Error codes:BMS_f008 - Vehicle may not restartBMS_w008 - Vehicle may not restartBMS_w009 - Service is requiredGTW_w017 - Electrical system power reducedGTW_w018 - Electrical system power reducedGTW_w157 - Power reduced (vehicle systems shutting down)DI_u014 - Unable to drive (voltage supply too low)

I set an appointment up with Tesla, but the soonest I can get in is Tuesday morning. I checked the voltage on my 12v, and got 11.92... when I take off the negative terminal, I get 4.0 volts. I'm suspicious it's my 12v battery

PLEASE NOTE IM NOT VERY SMART AT THIS. In no way am I professional. I was simply curious whether I could buy a new 12v battery to stick in so I have a car for the weekend.

Sounds like they will charge $88 to do a diagnosis. I will have to tow it to them as well (17 miles).

Anyway, just curious if anyone has seen these errors before, and what I could try while I wait for Tuesday.

I appreciate any comments or advice! Thank you 📷

It seems the smartest thing to do is to wait until Tuesday, pay the $88 for them to diagnose it, and hopefully it is something under warranty?

Edit: my appointment is Tuesday 10/5 at 9AM. I will update then :)

Edit 2: I replaced the 12 volt battery myself, and everything appears back to normal. Drove around for 30 minutes just fine. I'll still be going to Tesla service center tomorrow.

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