When your Xiaomi 15 Ultra refuses to recognize a charging or data cable, the phone may not charge, may not transfer files, or may connect and disconnect randomly. This issue often looks serious at first, but in most cases it is caused by dirt, settings, or a temporary software glitch. The fixes below focus on practical steps that usually restore proper USB-C detection.
Why Your Xiaomi 15 Ultra Is Not Recognizing the USB-C Cable
- Lint or dust is blocking the USB-C port.
- The cable or charger is damaged or not compatible.
- USB settings are set to charge only or not selected.
- Moisture protection temporarily disables the port.
- A software glitch is affecting USB detection.
1. Clean the USB-C Port Carefully
The USB-C port easily collects pocket lint and dust, which prevents the cable from making proper contact. Even a small amount of debris can stop charging or data transfer completely.
Power off your phone, and then unplug any connected cable.
Use a wooden toothpick or soft brush, and gently remove any lint or debris from the port.
2. Try a Different Cable and Charger
Not all USB-C cables support both charging and data transfer. A damaged or low-quality cable can make it seem like the port itself is broken.
Plug a different USB-C cable into your phone, and then connect it to a known working charger.
Try another power outlet or adapter to rule out charging issues.
3. Check USB Preferences When Connected
Your phone may be charging but not allowing data transfer due to the selected USB mode. This often happens after updates or when connecting to a new device.
Connect the USB cable to your phone, and then unlock the screen.
Swipe down to open notifications, and then tap the USB charging notification to select File transfer.
4. Restart the Phone
A restart refreshes system services that control charging and USB communication. This step often fixes detection problems caused by temporary software errors.
Press and hold the Power key, and then tap Restart.
Wait for the phone to boot up, and then reconnect the USB cable.
5. Let the Port Dry Completely
If your phone recently detected moisture, the USB-C port may be disabled to protect the device. This protection can stay active even after the phone looks dry.
Disconnect the cable, and then place the phone in a dry, well ventilated area.
Wait at least thirty minutes, and then try charging again.
6. Test USB Connection with Another Device
Testing with a computer or another phone helps confirm whether the issue is with the port or the cable. This step helps narrow down the real cause.
Connect your phone to a computer using a USB cable, and then unlock the screen.
Check if the phone appears as a storage device or prompts for USB options.
Most USB-C detection issues on the Xiaomi 15 Ultra are caused by debris, cable problems, or temporary software glitches. Once the port is clean and the correct USB mode is selected, charging and data transfer usually return to normal.
FAQs
Why does my Xiaomi 15 Ultra charge but not transfer files?
The USB mode may be set to charging only. You need to select File transfer from the USB notification after connecting the cable.
Can a bad cable damage the USB-C port?
Yes. Poor quality or damaged cables can cause unstable connections and long term wear on the port. Using certified cables helps prevent this.
When should I contact a service center?
If the phone does not recognize any cable after cleaning, restarting, and testing multiple chargers, the USB-C port may be physically damaged and needs professional repair.
