What a connected vehicle actually is
A connected vehicle is a car that can send and receive data over the internet or a cellular network while you drive. It does this through built-in hardware — usually a modem and an antenna — that lets your car talk to servers, other vehicles, and roadside infrastructure. The connection happens whether you're actively using a feature or not; your car is designed to stay linked as long as it has power and signal.
This is different from straightforward plugging your phone into your car's infotainment system. A connected vehicle has its own independent connection to the outside world. Your car might use that link to read map updates, send diagnostic data to the manufacturer, receive real-time traffic information, or alert emergency services if you crash. Some features require you to pay a subscription; others come built in.
Nearly every new car sold today has some form of connectivity. Older vehicles can sometimes add it through aftermarket devices, but the factory-installed systems are more integrated and harder to disable.
Key Takeaways
- Connected vehicles use a built-in modem to send and receive data over cellular networks, separate from your phone's connection.
- Common features include real-time traffic, remote diagnostics, emergency calling, and over-the-air software updates that install without a dealer visit.
- Your car collects data about how you drive, where you go, and vehicle performance — what gets shared depends on your manufacturer's privacy policy and your settings.
- Connectivity can improve safety through crash detection and emergency response, but it also creates security risks if the system is not properly protected.
- Subscription services vary widely by manufacturer; some features are free, while others require monthly or annual payments that continue even after you sell the car.
How the connection works and what your car sends
Your car connects through a cellular modem that works much like the one in a phone — it uses 4G LTE or 5G networks to reach the internet. The manufacturer installs a SIM card in the vehicle during production, and that SIM connects to a carrier (often a partnership between the automaker and a wireless company). When you turn on the car, the modem wakes up and establishes a connection automatically.
What your car sends depends on the manufacturer and the features you use. All connected vehicles transmit some diagnostic data — engine temperature, tire pressure, fuel level, mileage, and error codes — back to the manufacturer's servers. This helps them spot recalls and understand how vehicles are performing in the real world. Many also send location data, speed, acceleration patterns, and braking behavior. Some manufacturers collect this constantly; others only when you use a connected feature.
When you use a connected service — navigation, remote start, or roadside information — your car sends the data needed for that service to work. If you ask for directions, it sends your location. If you use remote diagnostics, it sends detailed information about your engine, transmission, and electrical systems. The data travels encrypted, but it still leaves your vehicle and goes to a company's server.
Features that depend on connectivity
Real-time traffic and navigation are among the most visible connected features. Your car receives live traffic data and can reroute you around congestion. This works because your vehicle is sending its location to the manufacturer or a mapping service, which uses that data (along with data from millions of other connected cars) to build a picture of traffic flow.
Remote diagnostics let you or a dealer check your car's health from a phone app. You can see fuel level, tire pressure, battery voltage, and whether any warning lights are on — all without being near the vehicle. Some systems let you lock or unlock the doors, start the engine, or honk the horn remotely, though these features usually require a paid subscription.
Over-the-air (OTA) updates are a major advantage of connectivity. Instead of taking your car to a dealer to install a software patch, the manufacturer can push updates directly to your vehicle while it's parked in your garage. These updates can fix bugs, improve performance, add new features, or patch security vulnerabilities. The update downloads in the background and installs when you're not driving.
Emergency services integration is a safety feature built into many connected vehicles. If your car detects a severe crash through its airbag sensors, it can automatically call emergency services, send your location, and provide information about the crash. Some systems also let you press a button to call for help manually. This feature typically works even if your phone is dead or out of range.
What happens to your data and who sees it
Your manufacturer collects and stores the data your car sends. What they do with it depends on their privacy policy, which you should read before you buy or lease. Some manufacturers sell anonymized data to third parties — insurance companies, traffic researchers, city planners, and advertisers all want to know how vehicles move and behave. Other manufacturers keep it tighter. The variation is significant, and there is no single standard across the industry.
Location data is the most sensitive. If your manufacturer knows everywhere you drive, they know where you work, where you live, where you worship, where you receive medical care, and where you spend your free time. Some manufacturers share this with insurance companies, which can use it to adjust your rates. Others sell it to data brokers. Some promise not to share it without your explicit consent, but "explicit consent" can mean a checkbox buried in a terms-of-service document.
You usually have some control through your manufacturer's app or vehicle settings. You can often turn off location sharing, limit what data is collected, or opt out of certain services. But the options vary by brand, and opting out of data collection sometimes disables features you want to keep. Read your manufacturer's privacy settings before you drive off the lot; waiting until later is harder.
Security risks and what can go wrong
A connected vehicle is a computer on wheels, and computers can be hacked. If someone gains access to your car's network, they could theoretically disable the brakes, lock you in, or take control of the steering. This sounds dramatic, but security researchers have demonstrated these attacks in controlled settings. The risk to any individual driver is low because hackers typically target high-value targets or large fleets, not random owners. But the risk exists.
Manufacturers are required to follow certain security standards, and most take it seriously. They use encryption to protect data in transit, they update software to patch vulnerabilities, and they test for weaknesses before releasing features. But no system is perfect. A vulnerability discovered after your car leaves the factory can be fixed through an over-the-air update, but only if you accept the update and only if the manufacturer releases one.
The bigger practical risk is that your car's systems can malfunction or be disrupted. A software bug in a navigation update could cause the system to crash. A loss of cellular signal could disable remote features. A manufacturer's server outage could prevent you from using connected services. These are inconveniences rather than safety threats, but they happen.
Subscription costs and what they cover
Connectivity itself is usually free for the first few years. The manufacturer builds the cost into the vehicle price and covers the cellular service as part of the warranty period. After that period ends — typically three to eight years depending on the brand — you may have to pay to keep the connection active. Some manufacturers charge a monthly fee (usually $10 to $20); others charge annually.
What the subscription covers varies. Some subscriptions unlock all connected features. Others are tiered: a basic plan might include emergency calling and diagnostics, while a premium plan adds remote start, navigation, and concierge services. A few manufacturers include connectivity free for the life of the vehicle, but this is less common.
If you stop paying, your car loses access to connected services. Navigation might fall back to offline maps. Remote features stop working. Emergency calling may still work (it's often required by law), but other services disappear. This matters when you sell the car: a buyer inherits the subscription status, and if the previous owner didn't pay, the new owner has to start a subscription to use those features.
How connectivity affects maintenance and repairs
Connected vehicles send diagnostic data to the manufacturer continuously, which means the manufacturer often knows about a problem before you do. If a sensor detects an issue, the car can alert you through the app or the dashboard before the problem gets worse. This can catch things like a failing battery or a tire losing pressure early, when a repair is cheaper and easier.
Dealers can also access this diagnostic data when you bring the car in for service. Instead of plugging in a scanner and running tests, they can pull the data remotely and see exactly what the car has been reporting. This can speed up diagnosis and reduce the time you spend in the shop. However, it also means the dealer knows how you drive — how hard you accelerate, how often you brake hard, whether you idle a lot — which could theoretically affect warranty coverage if the manufacturer claims you drove the car abusively.
Over-the-air updates can also prevent some repairs. If a software update fixes a problem that would have required a dealer visit, you save time and money. But if an update introduces a bug, you might have to wait for the next update or take the car to a dealer to have it rolled back. This is rare, but it has happened.
Frequently Asked Questions
Can I disable connectivity in my car?
Most connected vehicles let you turn off certain features through the settings menu, but you usually cannot disable the modem entirely. The manufacturer often needs the connection for safety features like emergency calling and for over-the-air updates. Some aftermarket devices can block the signal, but this may violate your warranty or the terms of your subscription.
Will my insurance rates go up if I have a connected vehicle?
Not automatically. However, if your insurance company has access to your driving data through your manufacturer, they may use it to adjust your rates. Some insurers offer discounts for connected vehicles because the data shows safe driving. Others use it to raise rates if the data shows risky behavior. Check your insurance company's policy before you buy.
What happens to my data if the manufacturer goes out of business?
This is unclear and varies by manufacturer. Some have promised to keep servers running indefinitely; others have not made this commitment. If a manufacturer shuts down its servers, connected features may stop working. Your historical data could be deleted, sold, or transferred to another company. This is a long-term risk worth considering if you plan to keep the car for many years.
Do I need a separate phone plan for my connected car?
No. Your car has its own SIM card and cellular plan, separate from your phone. The manufacturer typically covers the cost of the cellular service during the warranty period. After that, you may pay a subscription fee, but it is not the same as a phone plan and does not use your phone's data.
Can someone track my car using its connectivity?
Your manufacturer can track your car through the location data it sends. Whether anyone else can depends on your privacy settings and your manufacturer's policies. If you share access with family members through an app, they can see your location. If your data is sold to third parties, those parties could theoretically track you. Review your privacy settings and your manufacturer's data-sharing policies to understand who has access.