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If your 2018 Honda Civic's USB port isn't functioning, there could be several reasons behind it. Common culprits include a blown fuse, short wiring, software glitch, or USB hardware issue. To troubleshoot, start by checking the fuses located on the driver's side near the parking brake. Test if any other devices can connect and work through the USB port. Examine the wiring connecting to the USB port for loose connections or corrosion. If the issue persists, it's advisable to bring your car to a dealership for further diagnosis.
To troubleshoot a non-functional USB port in a 2018 Honda Civic, examine the cable connecting the port to the head unit for any signs of damage.