A connected car uses software to link sensors, control modules, mobile apps, wireless networks, and service systems. That connectivity supports useful features, but it also gives owners more accounts and devices to manage. Vehicle cybersecurity is shared across manufacturers, service providers, repairers, and drivers. An owner cannot inspect the car’s internal security design, but a few ordinary habits can reduce avoidable account and accessory risks.
What vehicle cybersecurity covers
Vehicle cybersecurity concerns the protection of automotive electronics, communication networks, software, users, and data from unauthorized access or manipulation. NHTSA describes it as a safety issue because modern vehicles rely on complex software and connected systems. The agency’s guidance for manufacturers discusses risk management across vehicle entry points, network architecture, software updates, and recovery planning.
Industry standards also address the engineering lifecycle. ISO/SAE 21434 sets cybersecurity engineering requirements for road-vehicle electrical and electronic systems, including development, production, operation, maintenance, and decommissioning. It is an engineering standard for organizations that develop vehicle systems. It does not give owners a checklist that can prove their car is secure.
Keep accounts and phone access under control
Protect the account used by the automaker’s app with a unique password. Turn on multifactor authentication if the service offers it. Lock the phone with a passcode or biometric method, install phone updates through its normal settings, and remove app permissions you no longer need. Be cautious with unexpected messages that ask you to sign in, share a one-time code, or install a vehicle app from an unfamiliar link.
Review who has access to the vehicle app, digital keys, location sharing, and remote features. Remove former drivers when a vehicle changes hands or when someone no longer needs access. Ask the manufacturer how to transfer ownership and remove a car from an account. Review the privacy settings as well; our connected-car data checklist explains where to look before selling or returning a vehicle.
Use software updates and service information carefully
Install vehicle updates through the official process and read the instructions for your exact model. Verify a message through the vehicle display or the manufacturer’s app instead of following a link in an unsolicited text. If an update fails or a security warning appears, record the message and contact the manufacturer or a qualified repairer. Avoid downloading firmware from a forum or changing a control module to unlock an undocumented function.
Follow the vehicle’s recall and service notices. A software update may address a particular issue, but the notice should explain the affected vehicles and required action. Check the official recall lookup for the region where the car is registered. A cybersecurity concern does not always mean that a car can be fixed with a software update, and an update announcement is not proof that every vulnerability has been removed.
Think about accessories and diagnostic devices
Some accessories connect to a vehicle’s diagnostic port or network. A fleet tracker, insurance device, remote starter, dash camera, or scan adapter can provide useful functions, but owners should know who made it, what data it collects, whether it stays powered, and how to remove it. Choose a reputable product with clear support and a specific compatibility listing. Do not leave an unknown diagnostic dongle connected simply because it was present when you bought the car.
Before a repair, tell the shop about aftermarket equipment and ask whether it needs to be disconnected. Use qualified service providers for repairs that affect electronic control systems, keys, or safety equipment. Do not bypass an immobilizer, alter safety-critical software, or share diagnostic credentials with someone you cannot verify.
Protect keys and vehicle access
Follow the owner’s manual for physical keys, keyless entry, and digital keys. Keep spare keys accounted for and remove digital keys from phones or accounts that no longer belong to a driver. If a key is lost, ask the manufacturer or dealer about disabling it and pairing a replacement. Do not share a temporary access code in a public post or message thread.
For a used vehicle, confirm that the previous owner has transferred or removed connected accounts and digital access. If the vehicle supports a factory reset, use the manufacturer’s documented owner-transfer procedure. A reset may not remove a remote account, subscription, or digital key on its own.
What to do if something seems wrong
Unexpected account alerts, a digital key you did not create, unexplained app access, or a warning about a control system deserves attention. Change the relevant account password from the official app or website, revoke unknown sessions if the service allows it, and contact the manufacturer. Save messages and service records. If the vehicle displays a safety warning or behaves abnormally, park safely and follow the manual before continuing the trip.
Do not attempt a repair by probing wiring or disabling a system. For theft, account compromise, or a suspected vehicle security incident, contact the manufacturer and local authorities as appropriate. The right response depends on the symptom and the vehicle.
A practical owner checklist
- Use a unique password for connected-car accounts and enable multifactor authentication when available.
- Keep the phone and vehicle software current through official channels.
- Review app users, location settings, digital keys, and remote-access permissions.
- Remove unrecognized accessories from the diagnostic port and check products before installing them.
- Transfer account ownership and revoke former access when buying, selling, or sharing a car.
- Use a qualified repairer for electronic or safety-system work and follow the vehicle-specific service information.
These steps help manage accounts and accessories. The automaker and its suppliers remain responsible for designing and maintaining the vehicle’s technical security controls over the full product lifecycle.
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