The rental car's USB port wants more than your battery level.
Last reviewed July 16, 2026
Your own car is the one place you want the USB connection to work - CarPlay, Android Auto, your music, your contacts. A rental is different: the FTC's rental-car guidance tells renters that “in some cases, the USB connection may transfer data automatically,” and recommends charging from the cigarette-lighter adapter instead of the car's USB port.
Why this one is different from airport ports
Airport-port attacks require an attacker; a rental car's infotainment system collects data by design. Pair or plug in, and depending on the vehicle it may store your contacts, call and message logs, text messages, and locations you've entered into the GPS - like where you live or work - where, unless it's deleted, the FTC notes future renters or rental-car employees may be able to see them.
What renters can do
- Charge from the 12V adapter, as the FTC suggests - no data path.
- Don't pair or plug into the infotainment system unless you need it - and if you do, delete your device from the system's settings before returning the car.
- Carry a cable that can't sync unless you choose to. This is the one scenario where a switchable cable beats a permanent data blocker: flip to data mode for CarPlay in your own car, flip to protected mode in the rental - one cable, and the light shows which mode you're in.
How the switch works: How it works · The wider habit list: Public charging safety checklist