The reasons and solutions for this situation are as follows:

1. File format problem: If the music file format in the U disk is not in a format that the vehicle can recognize, the U disk cannot be read. Pick. Common car music formats are MP3 and WMA, and music files can be converted to one of these two formats.

2. Problems with the U disk itself: The U disk is damaged or has bad blocks, causing some files to be damaged or unreadable. You can try replacing a new USB flash drive to see if the problem can be solved.

3. USB port problem: If the USB port of the vehicle is damaged, it may also cause the U disk to be unable to be read. At this time, you can insert the U disk into the USB port of other vehicles to see if the data of the U disk can be read correctly. If the USB flash drive can be read normally on other vehicles, then the USB port of the vehicle is damaged and needs to be repaired in time.