

Good starting point would be looking up forum or blog posts from people who have disconnected the modem/TCU on a particular EV model. No self-interested auto manufacturer (all of them) would intentionally provide an option in the user interface to take the telemetry system offline. Take note of any side-effects they report, if it needs to be reconnected for inspections, and if there’s any gotchas between software and hardware revisions.

Me realizing I’m ahead of the game because I live in a home with a septic tank. But when you have to pump that tank every 5 years, if you can’t do that yourself, it’s going to be a lot less anonymous than a centralized sewer.