Most people think of their car as a machine that gets them from one place to another. The truth is that a new vehicle is a rolling computer with dozens of sensors, a cellular connection, and a hard drive that remembers far more than you would expect. In 2023, the Mozilla Foundation reviewed the privacy practices of 25 major car brands, and every single one failed the test. Not one brand passed. That made cars the worst product category the researchers had ever reviewed, worse than dating apps, worse than smart speakers, worse than fitness trackers. When a device you paid tens of thousands of dollars for is spying on you more aggressively than a free app, something has gone sideways.
Start with location, because that is the obvious one. Your car knows every place you have driven, when you arrived, and how long you stayed. It can piece together where you work, where you sleep, which church you attend, and which doctor you visit. On top of that, connected vehicles track how you drive, meaning your speed, your braking, how hard you take corners, and whether you wear your seatbelt. Many infotainment systems also pull data from the phone you plug in, which can include your contacts, your call history, and your text messages. Some manufacturers state in their own policies that they may collect information as sensitive as your immigration status or health details, even if they rarely do.
The data gets out through channels most drivers never think about. The infotainment screen, the manufacturer's companion app, and the built in cellular modem all feed information back to company servers. When you download the app to start your car from your phone or check your fuel level, you usually agree to a privacy policy that runs thousands of words. Buried inside that policy is language giving the company the right to collect, store, and share what your car records. Features that feel like conveniences, such as roadside assistance or automatic crash reporting, are also the exact pipelines that keep the data flowing. You said yes without realizing how much you were saying yes to.
Then comes the part that costs real money. Reporting has shown that several automakers shared detailed driving behavior with data brokers, and those brokers packaged it into reports sold to insurance companies. Drivers discovered their premiums had jumped and could not figure out why, until they requested their own file and found a record of every hard brake and fast acceleration. They never signed up for a monitoring program in any way they understood. Your driving was scored and sold, and the bill arrived months later in the form of a higher rate. Data that felt invisible turned into a number that followed you.
Opting out is harder than it should be. The consent is often bundled into the purchase or the app setup, so declining can mean losing features you actually want. Used cars carry another problem, because the previous owner's paired phone data and saved locations frequently remain in the system long after the sale. Deleting your information usually requires digging through menus, calling customer service, or filing a formal request that the company is slow to honor. The whole design nudges you toward leaving everything on and asking no questions. That friction is not an accident.
You still have moves worth making. Go into your infotainment settings and turn off data sharing and any usage based tracking you did not intentionally sign up for. Unpair your phone before you sell or trade the vehicle, and run a full factory reset so your contacts and location history do not travel to the next owner. If you live in a state with a consumer privacy law, you can submit a request asking the manufacturer to disclose and delete the data it holds on you. Skip the optional connected app if you do not truly need remote start or remote unlock. None of this makes you invisible, but each step shrinks the trail.
The larger point is not that cars are evil. It is that the industry quietly decided your vehicle should be a data product, and nobody put that choice in front of you in plain language. Convenience and surveillance now ride in the same seat, and the tradeoff is real whether you notice it or not. Knowing what your car records puts you back in a position to decide how much of it you are comfortable giving away. That awareness is the whole game, because you cannot manage what you do not know is happening. The machine in your driveway is listening more than you thought, and now you can drive with your eyes open.
