Hyundai Ioniq5 had a bad issue with the bluetooth polling some server thousands of times a second. It drained the 12V battery not the main battery but it meant

Hyundai Ioniq5 had a bad issue with the bluetooth polling some server thousands of times a second. It drained the 12V battery not the main battery but it meant you couldn't start the car. It was a huge problem that took a long time to figure out, so stupid.