Hi friend.   I had the same problem. Fixed by downloading Driver Booster 9 and updating the battery driver. apparently the bios update causes the system to view usb type-c as a charging input. I hope it serves you. If so please tell us in the cometaries so that others can solve the problem.
Latest BIOS update included a firmware update for main USB PD Controller 1, after the update the USB C port does not work at all.It won't charge, won't transfer data and does not show anymore in device manager. Is there a way to downgrade USB PD controller firmware?Tried downgrading BIOS but it says PD controller version is the latest and won't downgrade it, just the BIOS.
INSPIRON 5490 USB C not working after BIOS 1.10.0 update