Abnormal tire pressure display may be caused by the following reasons:

1. Tire pressure monitoring system failure: Check whether the tire pressure monitoring system is faulty. You can try to restart the vehicle, or Unplug the negative cable of the battery for a while and then reconnect it.

2. Tire pressure sensor failure: The tire pressure sensor may be faulty or damaged, resulting in the inability to display tire pressure information. Need to go to a professional vehicle repair shop for inspection and replacement.

3. Tire pressure monitoring system setting problem: The tire pressure monitoring system of some vehicles needs to be set manually. It may be that you have not set the tire pressure monitoring system correctly, resulting in the failure to display. Check your vehicle's owner's manual for the correct setup.

4. Display failure: If other functions and displays are normal and only the tire pressure monitoring system cannot be displayed, the display may be malfunctioning. Need to go to a professional vehicle repair shop for inspection and repair.