I sent the following email to Tesla Service:
Tesla Service ,
I had my 12v battery replaced one day after the first warning message appeared. Replacement resolved three issues that I’ve been working around for a very long time lessening my enjoyment of my vehicle:
If a customer complains about issues that you are unable to resolve, try replacing the 12 volt battery.
Note that I had received my 2nd year service 2 weeks before the failed battery message appeared. The problems reported had been going on from weeks (key fob) to a year (Bluetooth). I just lived with them. I am posting to illustrate that problems that may seem to be unrelated to the 12 volt battery may be resolved by replacing it.
Tesla Service ,
I had my 12v battery replaced one day after the first warning message appeared. Replacement resolved three issues that I’ve been working around for a very long time lessening my enjoyment of my vehicle:
- The button on my High Power Wall Charger nozzle would not open the charging port. I had to press the left side of the port to get it open.
- My car wouldn’t recognize key fobs until I took them out and either put it in the cup holder or press buttons on the fob a few times. This made managing the doors, frunk, and trunk difficult. I used to be able to leave my fob in a pocket or in my purse and it would be recognized. I told the service center that I suspected the fob issue was related to the 12V. After the battery was replaced, they noticed that the fob problem (which they also observed) was gone.
- My phone's Bluetooth connection is finally working consistently in my garage. My garage was the only place it would have a problem. I complained to Tesla months ago but they had no resolution. I tried many things — toggling WiFi, adding a repeater — to no avail. I needed to exit my garage before using my phone. Now I can finish phone calls and listen to tunes on my phone when I arrive home in my car.
If a customer complains about issues that you are unable to resolve, try replacing the 12 volt battery.
Note that I had received my 2nd year service 2 weeks before the failed battery message appeared. The problems reported had been going on from weeks (key fob) to a year (Bluetooth). I just lived with them. I am posting to illustrate that problems that may seem to be unrelated to the 12 volt battery may be resolved by replacing it.