Cars aren't just basic machines anymore. Modern vehicles rely on dozens of computers and increasingly sophisticated software to control everything from infotainment and connectivity to charging and driver-assistance features.
Back in 2012, Tesla introduced a technology familiar to smartphone users: over-the-air, or OTA, updates. But what exactly is an OTA update for a car, and what can one actually do?
What Does OTA Mean?
OTA stands for over-the-air, meaning software can be delivered wirelessly to a vehicle instead of requiring a technician to connect a diagnostic computer at a dealership.
Depending on the automaker and vehicle, an OTA update can be downloaded through the car's built-in cellular connection or Wi-Fi. Once the software is downloaded, the driver may receive a notification to install it immediately or schedule the installation for a more convenient time.
The technology is not entirely new, but it has become increasingly important as cars have become more connected and software-dependent.
Some vehicles can now receive updates long after they've left the factory, allowing manufacturers to modify or improve certain systems without requiring an in-person service visit.
What Can An OTA Update Change?
The answer depends on the car and the specific software update. Some OTA updates are relatively small, addressing bugs or improving the performance and stability of an infotainment system. Others can make more noticeable changes to a vehicle's functionality. An update can potentially:
- Fix software bugs
- Improve infotainment performance
- Add or modify connected services
- Update navigation-related software
- Improve EV charging functions
- Modify certain driver-assistance features
- Add new software-based functionality
- Address some software-related security issues
However, OTA updates have limits. Software can't replace missing or damaged hardware. A worn brake component, defective physical sensor, damaged battery hardware, or other mechanical problem will generally still require conventional service.
Similarly, not every vehicle system can necessarily be updated wirelessly. Some software changes, particularly those involving certain safety-critical systems, may still require a dealership or qualified technician.
How Does An OTA Update Work?
The process is fairly straightforward from the driver's perspective. The automaker makes an update available for a particular vehicle or group of vehicles, and the car downloads the necessary software over its internet connection.
Before installation, the vehicle may check whether certain conditions have been met. For example, an electric vehicle could require a sufficient state of charge, while some updates may only be installed when the car is parked and switched off.
Depending on the update, installation might take only a short time or require the vehicle to remain stationary for longer. Drivers should follow the manufacturer's instructions and avoid interrupting an installation once it has started.
The car generally uses its own cellular connection or Wi-Fi rather than relying on a smartphone's mobile data. Exactly how connectivity works varies by automaker, vehicle, market, and subscription plan.
Can An OTA Update Improve a Car?
Yes, but the extent of the improvement depends on the vehicle's hardware and software. An automaker can sometimes use software updates to improve responsiveness, efficiency, charging behavior, infotainment performance, or other electronic functions. In some cases, an update can even introduce capabilities that weren't available when the vehicle was originally delivered.
But software can't overcome every hardware limitation. An OTA update can't magically add a sensor, larger battery, more powerful motor, or other physical component that the vehicle doesn't have. What a manufacturer can change is ultimately determined by the hardware already installed and the vehicle's software architecture.
OTA updates can also be useful when a problem turns out to be software-related. Rather than asking thousands of owners to visit a dealership, an automaker may be able to distribute a fix remotely. That doesn't mean every software problem can be solved this way, though. Some faults will still require physical inspection or repair.
What Do Car Owners Say About OTA Updates?
Reddit discussions show that the real-world OTA experience varies considerably between automakers. In a 2024 r/electricvehicles thread, owners compared how frequently their vehicles received meaningful updates, with some reporting multiple feature or software updates and others saying their cars had received little or nothing.
A separate 2022 discussion raised the same question, with owners comparing update frequency across models from Ford, Tesla, Polestar, Volkswagen, and others.
Another recurring issue is that OTA capability doesn't guarantee frequent feature additions. In a 2025 r/electricvehicles discussion, owners asked which automakers had actually committed to ongoing OTA feature updates, highlighting the difference between a vehicle being technically capable of receiving updates and a manufacturer regularly using that capability to add functionality.
Owners have also raised concerns about updates changing or removing existing features. In one r/electricvehicles thread, a user questioned whether an OTA update could remove a feature they valued, while another discussion included concerns about manufacturers being able to change software-controlled functions after a vehicle has been purchased. These conversations illustrate one of the unusual aspects of software-defined cars: the feature set is not necessarily as fixed as it was with traditional vehicles.
There are also reminders that wireless updates can occasionally go wrong. In a 2023 r/Rivian thread, the automaker acknowledged an OTA software problem that affected the infotainment systems of some R1T and R1S vehicles and said a remote fix was subsequently developed.
Other Rivian owners have similarly discussed failed updates and the possibility of requiring service. These are individual owner reports, not representative data, but they demonstrate why OTA systems need extensive testing, staged rollouts, clear communication, and recovery options when an update doesn't install correctly.
Are OTA Updates Safe, And Do All Cars Have Them?
Automakers design OTA systems with reliability and cybersecurity in mind, and software is generally tested before being distributed to customers. Still, drivers should follow the manufacturer's instructions and make sure the vehicle meets any requirements before beginning an update.
Not every car supports OTA updates, either. The technology is particularly common among newer, highly connected vehicles, but its capabilities vary significantly between manufacturers and models. One car might support wireless updates for its infotainment system, while another may be capable of updating software across several vehicle systems.
Older vehicles may not have OTA functionality at all, and even cars that support OTA updates can still require dealership visits for certain repairs and software changes.
Ultimately, an OTA update is simply software delivered wirelessly to a car. What makes the technology significant is how much modern vehicles now depend on software. As cars become more like connected computers on wheels, updating software remotely is becoming an increasingly normal part of car ownership.
