MediaTek Bluetooth Adapter repeatedly disappears (Code 45) on HP Pavilion 15-eg2xxx

[desultorybiped]

Hello,

I own an HP Pavilion Laptop 15-eg2xxx (SKU: 6D4L1PA#ACJ).

I am experiencing an intermittent Bluetooth issue.

The MediaTek Bluetooth Adapter repeatedly disappears from Windows after startup or after some time. When this happens:

• The Bluetooth toggle disappears from Windows Settings.
• Device Manager previously reports Code 45 ("Currently, this hardware device is not connected to the computer.")
• PowerShell reports the MediaTek Bluetooth Adapter as Disconnected.
• Wi-Fi continues to work perfectly throughout the issue.

The problem temporarily resolves after reinstalling drivers or updating the BIOS, but it always returns later.

I have already completed the following troubleshooting:

• Updated Windows to the latest version.
• Updated the BIOS to the latest HP version.
• Installed the latest HP Bluetooth driver.
• Installed the latest HP chipset drivers.
• Updated Intel Management Engine drivers.
• Ran sfc /scannow (which repaired corrupted system files).
• Ran DISM /Online /Cleanup-Image /RestoreHealth.
• Reinstalled the MediaTek Bluetooth driver multiple times.
• Verified Bluetooth Support Service is running.
• Ran HP diagnostics.

Since Wi-Fi continues to function normally while only Bluetooth disconnects, I suspect either a firmware issue affecting the MediaTek Bluetooth interface or a hardware issue with the wireless module.

Could you please advise whether this is a known issue for this model or whether the MediaTek wireless card should be inspected or replaced?

Thank you.

[Frankly4]

Been having similar issue on HP Victus 16 since yesterday.

Bluetooth suddenly stops working, when trying to turn it on or off it goes into Code 43 sometimes into Code 45, updating and reinstalling drivers did nothing to help, tried restarting and setting the bluetooth support service to automatic, ran the bluetooth troubleshooter that didn't help either,  when tried to run the HP diagnostics app, it removed the driver for the mediatek bluetooth adapter which just made it go into Code 45 in device manager.

Restarting the laptop seems to be the only fix and it is a temporary one because it randomly stops working again within a few hours.

[desultorybiped]

Hi, could you please tell me:

• Which Windows 11 version are you using (24H2 or 25H2)?
• Is your Wi-Fi still working normally when Bluetooth disappears?
• Is your laptop also using a MediaTek Wi-Fi/Bluetooth card?
• Did this start after a recent Windows Update?

[Kuroi_Kenshi]

Hi @desultorybiped,

Welcome to the HP Support Community!

Thank you for providing such a detailed description of the issue and the troubleshooting you've already completed. Based on what you've described, you've already ruled out most common software causes.

If you haven't already, I recommend checking the following:

1. Perform a hardware reset.

A hardware reset can reinitialize the embedded controller and wireless hardware.

1. Shut down the notebook.
2. Disconnect the AC adapter and all external devices.
3. Press and hold the Power button for 15 seconds.
4. Reconnect the AC adapter and start the notebook.

This helps clear residual electrical states that can occasionally prevent hardware from initializing correctly.

2. Test in HP Hardware Diagnostics UEFI

Restart the notebook and tap Esc, then press F2 to launch HP PC Hardware Diagnostics UEFI.

If a wireless or Bluetooth test is available, run it. This helps determine whether the Bluetooth hardware is consistently detected outside of Windows.

3. Check Event Viewer

If the Bluetooth adapter disappears after some time, review Event Viewer under Windows Logs > System around the time the issue occurs.

Look for entries related to:

• MediaTek
• USB
• PnP
• Kernel-PnP
• BTHUSB

These events can help identify whether Windows is unexpectedly losing communication with the Bluetooth device.

Let me know if it helped or if you need further assistance.

Take care and have a wonderful day ahead! 🚀

Best regards,

Kuroi_Kenshi