How to fix Bluetooth devices not pairing or disconnecting on macOS

Summary

This guide helps you troubleshoot and resolve: How to fix Bluetooth devices not pairing or disconnecting on macOS. Follow the steps below to fix the issue.

Common Causes

Bluetooth issues on macOS can be frustrating, especially when your wireless keyboard, mouse, headphones, or other peripherals refuse to pair or keep dropping the connection. In most cases, the problem is caused by minor software glitches, outdated drivers, or interference from other devices. This guide walks you through a series of proven troubleshooting steps, starting with the quickest fixes and moving on to more detailed solutions.

Quick Fix Steps

Before diving into detailed troubleshooting, try these fast solutions that resolve the majority of Bluetooth pairing and disconnection issues:

1. Toggle Bluetooth off and back on. Click the Bluetooth icon in the menu bar and select Turn Bluetooth Off, wait five seconds, then turn it back on.
2. Restart your Mac. Choose Apple menu > Restart from the top-left corner.
3. Restart the Bluetooth device. Power it off, wait ten seconds, then power it back on.
4. Check the device's battery. Low battery levels are one of the most common causes of pairing failures and dropped connections.
5. Move closer to your Mac. Bluetooth typically works best within ten metres, with no solid obstacles between the devices.

Detailed Instructions

Remove the Device and Re-Pair It

Removing a problematic device and pairing it again from scratch clears out any corrupted pairing data stored on your Mac.

1. Open System Settings from the Apple menu.
2. Click Bluetooth.
3. Locate the affected device in the list.
4. Click the Info (i) button next to the device name.
5. Select Forget This Device and confirm.
6. Put the device into pairing mode (usually by holding a button until an LED flashes).
7. Click Connect next to the device name when it appears in the Bluetooth list.

Reset the Mac's Bluetooth Module

If re-pairing does not work, resetting the Bluetooth module can clear deeper software issues without affecting your other files.

1. Hold Shift + Option and click the Bluetooth icon in the menu bar.
2. Select Reset the Bluetooth Module from the hidden menu.
3. Click OK to confirm.
4. Wait for your Mac to restart Bluetooth automatically, then try pairing your device again.

Delete Bluetooth Preference Files

Corrupted preference files can prevent macOS from managing Bluetooth connections correctly. Deleting them forces macOS to recreate them on the next restart.

1. Open Finder and choose Go > Go to Folder from the menu bar.
2. Type /Library/Preferences/ and press Return.
3. Locate and move the following files to the Trash:
   • com.apple.Bluetooth.plist
   • com.apple.Bluetooth.plist.lockfile (if present)
4. Restart your Mac.

Troubleshooting

Check for macOS Updates

Apple regularly releases updates that include Bluetooth driver fixes and stability improvements. Running an outdated version of macOS can cause compatibility issues with newer peripherals.

1. Open System Settings > General > Software Update.
2. If an update is available, click Update Now.
3. Restart your Mac when prompted and test your Bluetooth device.

Reduce Wireless Interference

Bluetooth operates on the 2.4 GHz frequency, which is shared with Wi-Fi routers, microwaves, and other wireless devices. Interference can cause dropouts and failed pairings.

• Move your Mac away from USB 3.0 devices, which can generate signal noise.
• Keep Bluetooth devices away from Wi-Fi routers and microwave ovens.
• If your router supports both 2.4 GHz and 5 GHz bands, connect nearby devices to the 5 GHz band to reduce congestion.
• Disconnect any unused USB devices, as some can interfere with Bluetooth signals.

Try a Different USB Port or Hub

If your Bluetooth device uses a USB dongle, the port or hub it is connected to may be causing the issue.

• Plug the dongle directly into a USB port on your Mac rather than through a hub.
• Try a different USB port, preferably one on the opposite side of the Mac.
• Avoid using dongles in ports next to other USB 3.0 devices.

Boot into Safe Mode

Safe Mode loads only the essential macOS components, which helps identify whether a third-party app or driver is causing the Bluetooth issue.

1. On an Intel-based Mac, restart and hold Shift immediately after the startup chime.
2. On an Apple Silicon Mac, shut down, then hold the Power button until "Loading startup options" appears. Select your startup disk, then hold Shift and click Continue in Safe Mode.
3. Test your Bluetooth device while in Safe Mode.
4. If the device works correctly in Safe Mode, restart normally and consider whether any recently installed software could be causing the conflict.

Check for Hardware Issues

If none of the above steps resolve the issue, the problem may be hardware-related.

• Try the Bluetooth device on another Mac or computer to confirm it is working correctly.
• Try a different Bluetooth device with your Mac to determine whether the issue lies with the Mac or the peripheral.
• Run Apple Diagnostics by restarting and holding D on Intel Macs, or holding the Power button on Apple Silicon Macs to access startup options and selecting Diagnostics.

Reset NVRAM or PRAM (Intel Macs Only)

On Intel-based Macs, resetting NVRAM can resolve underlying Bluetooth and wireless issues.

1. Shut down your Mac.
2. Press the Power button, then immediately hold Option + Command + P + R.
3. Hold the keys for about 20 seconds. Release them after your Mac restarts and you hear the startup chime a second time, or see the Apple logo appear and reappear.
4. Test your Bluetooth device.

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