Why can a car USB only charge but not read data?

[AndersonFitz]

When a car USB port can only charge but not read data, it's due to different application scopes of USB interfaces. Generally, USB ports designed solely for data reading provide a current of 0.5A, while mobile phone charging interfaces require at least 1A current output. Below are relevant introductions about automotive USB usage: 1. Usage method: Insert the USB device into the car's USB port. Turn on the device power to use it, and you can also copy MP3 music files from a computer. 2. Precautions: USB drives require driver loading during use. If the USB drive or phone occasionally isn't recognized, try reconnecting it. Remove USB drives when not in use for extended periods to prevent accelerated aging, as the host system frequently reads/writes the drive, affecting system performance. Keep USB ports clean and tidy - corrosion, moisture, small debris or other foreign objects in the port may cause connection failures.