Why AirPods on Mac Suddenly Only Connect to One Ear and How to Fix It

One day, suddenly, one of your AirPods goes silent.
The right one plays sound, but the left one is silent. Even after restarting or opening settings,
it just won't come back—have you ever been troubled by such a phenomenon?

In fact, this symptom is often not caused by a hardware failure of the AirPods themselves, but by
corrupted macOS Bluetooth cache.

Why does it stop recognizing only one ear?

macOS saves Bluetooth configuration information as a cache for each connected device.
This cache records connection history, pairing status, volume levels, etc.,
acting as a "memory area" to make future connections smooth.

However, when this cache becomes corrupted due to macOS updates or communication errors during sleep,
strange phenomena occur, such as only one ear being recognized or audio cutting out.
Reports have been increasing, especially since
macOS Sonoma and later.

Correct Reset Procedure

In most cases, deleting the Bluetooth cache and re-pairing will
restore functionality immediately.

1. Put the AirPods back in the case and close the lid

2. Turn off Bluetooth on your Mac

3. Open Finder and navigate to the following folder:
   /Library/Preferences/

4. Delete com.apple.Bluetooth.plist

5. Restart your Mac

6. Press and hold the button on the back of the AirPods case for15 secondsuntil the light flashes white

7. Turn on Bluetooth on your Mac and pair again

This will regenerate a new Bluetooth cache,
and both ears will be recognized normally.

If it still doesn't work

・Check if they work normally on another device (iPhone / iPad)
・Avoid Bluetooth interference (proximity to USB 3.0 hubs or wireless mice)
・Delete related files in ~/Library/Preferences/ByHost as well

If the issue persists after trying these,
it is best to suspect a hardware contact issue (dirt on the charging terminals).
Cleaning with a cotton swab and anhydrous ethanol may improve it.

AirPods returning to silence

AirPods are not just wireless earphones.
They are a device designed to bring intimate conversation with your Mac into the silence.
When sound cuts out, there is a "disruption of consistency."
By organizing the cache, that world of transparent sound will return.

(This article contains affiliate links.)