Submitted by Zooner on 18. August 2019
My 2019 Tesla Model 3 purchased 5 months ago, suddenly gave a warning on the highway that the “12v power is very low and vehicle may shut down unexpectedly”
The car had been charged with 250+ miles of range. Once stopped the car wouldn’t respond and even flashers wouldn’t work. Their support staff did not know how to fix this or even how to keep flashers on. Luckily I had exited the highway into a residential area where flashers weren’t necessary. This is sudden and dangerous.
Reading on other forums, many have had this problem. If the batteries are bad, Tesla should be able to replace them proactively working with their suppliers. If the batteries aren’t bad then it has to be the charging system. Instead they just replace the batteries. Some users have had this happen multiple times and a few have gotten Tesla to replace the charging system.
I find this appalling product reliability and poor engineering. A battery can be monitored and failure can be detected several charge cycles (days) in advance. Tesla needs to do a recall to fix the charging system and install a proper monitoring system for the 12 volt. Replacing the battery is just putting the driver at risk of being stranded again.
I have filed a report with NTHSA. If you’ve experienced this, you should too. I now feel I cannot rely going any distance from my home in my Tesla.