Edit: Just asked because of curiosity. I’m not actually looking for such vehicles.
Edit 2: So for context, my parents new Toyota has this feature that allows the GPS location of the car to be sent to toyota, then you can see the location via an app on android/ios (it’s supposed to be an anti-theft feature). The data is sent via an antenna that connects to cell towers, which then connects to the internet, and to the toyota servers. “Diagnostic” and “maintenance” information is also sent via those same antennas.
The dealer said it could be turned off, but who knows if they are really off. There’s not a hard switch on the car.
First, you need to differentiate between “dealer” and “manufacturer”, except in minority cases like Tesla, they are two separate entities.
Dealers, as a rule, don’t have the capacity to accept telemetry data from vehicles. Source: I’m a former dealer sysadmin.
What they can and do do, is download telemetry data stored onboard when you bring the vehicle in for service. This is done through the OBD-II port which has been in every car since 1996.
https://www.makeuseof.com/tag/obd-ii-port-used/
If you’re concerned (or curious) about what data is passed over OBD-II, you can buy your own scanner, $20 to $100 on Amazon depending on features.
Now, MANUFACTURERS, that’s a different deal:
https://www.chicagotribune.com/autos/sc-auto-tips-0102-driving-data-collection-20181225-story.html
For you asking OP twice to specify “privacy” and “modern” (which was very clear what they means, to me at least) your answer is somewhat disappointing now 😁
Telling them that a) dealers don’t have access to telemetry data beyond what’s passed on the vehicle data port and b) providing a news article showing that 3/4 new cars communicate data back to the manufacturers unless you specifically opt out isn’t helpful?
Guessing you didn’t actually read the article?