[bb123]

Nothing immediately - Teslas have a both a High Voltage system for the traction battery and a Low Voltage system powered by a separate 12-15V battery. The HV system keeps the LV system charged and most critical safety related functions run on the 12V system. The booster, ABS/ESP, airbags, and steering assist are all designed to remain functional long enough for a controlled stop after an HV disconnection.

You obviously wouldn't be able to speed up again, which depending on the situation, would be where the danger lies.

[MrBuddyCasino]

Didn‘t they switch to 48V?

[guywithahat]

Only on the cybertruck, the Y and 3 are still mostly 12v

[sebazzz]

16V internally