Thunderbolt 4 / USB4 Devices Not Working? 9 Proven Fixes (2026)

Table of Contents

• Why Thunderbolt 4 / USB4 Devices Not Working Occurs
• Method 1: Check BIOS/UEFI Settings
• Method 2: Update Thunderbolt and Chipset Drivers
• Method 3: Uninstall and Reinstall Thunderbolt Drivers
• Method 4: Check Device Manager for Errors
• Method 5: Use a Certified USB4/Thunderbolt Cable
• Method 6: Disable PCIe Link State Power Management
• Method 7: Check USB4 Connection Manager Settings
• Method 8: Roll Back Recent Windows Updates
• Method 9: Perform a Power Drain
• Frequently Asked Questions

Thunderbolt 4 devices not working is a common frustration for users relying on high-speed docks, external GPUs, and storage devices. When Thunderbolt 4 devices not working, you may see a yellow exclamation mark in Device Manager, the device may not be detected at all, or the connection may drop intermittently. According to Microsoft’s documentation, Thunderbolt 4 support in Windows 11 is integrated through the USB4 host router[reference:0][reference:1]. This integration means that Thunderbolt 4 and USB4 devices share the same underlying technology stack. This guide covers every possible cause and provides clear, step-by-step fixes to resolve Thunderbolt 4 devices not working on Windows 10 and Windows 11 systems.

For more PC troubleshooting guides, visit our Windows 11 Troubleshooting Hub. You can also check our guide on PCIe compatibility, our guide on USB-C issues, and our guide on PC shutdowns for additional help.

For additional assistance, refer to Microsoft’s official USB-C support page and check the server status at DownDetector.

Why Thunderbolt 4 / USB4 Devices Not Working Occurs

Several factors can cause Thunderbolt 4 and USB4 devices to malfunction. According to Microsoft’s support documentation and hardware forums, the issue is often related to driver conflicts, BIOS settings, or power management problems.

Here are the most common reasons why Thunderbolt 4 devices not working happens:

• BIOS/UEFI Configuration Issues: Certain BIOS settings, such as “Disable USB4 PCIE Tunneling” being set to ON, can prevent Thunderbolt devices from being detected correctly[reference:4]. Thunderbolt Technology Support must also be enabled[reference:5].
• Outdated or Corrupt Drivers: Thunderbolt drivers can become outdated or corrupted after Windows updates, causing devices to fail or show errors[reference:6].
• Windows Update Conflicts: Recent Windows 11 updates have been known to cause USB4/Thunderbolt tunneling malfunctions, particularly affecting audio interfaces and docks[reference:7]. The malfunction is likely in the USB4/Thunderbolt tunneling path on the USB4 host router[reference:8].
• Power Management Settings: PCIe Link State Power Management can interfere with Thunderbolt connections[reference:9].
• Incompatible or Low-Quality Cables: Using non-certified or low-quality cables can cause detection failures. Microsoft recommends using the cable provided by the device manufacturer or a certified USB4 cable[reference:10].
• IOMMU or PCIe Settings: Some users have resolved issues by disabling IOMMU in BIOS or forcing PCIe slots to Gen 4 mode[reference:11].

Method 1: Check BIOS/UEFI Settings

According to Dell’s official support documentation, the most common cause of Thunderbolt 4 devices not working is incorrect BIOS settings[reference:12]. The issue occurs when “Disable USB4 PCIE Tunneling” is set to ON or when “Thunderbolt Technology Support” is disabled[reference:13].

1. Restart your PC and enter BIOS/UEFI (usually by pressing Delete, F2, or F12 during boot).
2. Navigate to the Thunderbolt or USB settings—the exact location varies by motherboard manufacturer. Look for options like:
   • “Thunderbolt Configuration” or “Thunderbolt Technology”
   • “USB4 Configuration” or “USB4 PCIE Tunneling”
3. Set “Disable USB4 PCIE Tunneling” to OFF. The factory default setting is OFF[reference:14].
4. Set “Thunderbolt Technology Support” to Enabled[reference:15].
5. If available, set “Thunderbolt Security” to “None” or “User Authorization” depending on your needs.
6. Save changes and exit BIOS (usually F10).
7. Test your Thunderbolt device after booting into Windows.

Method 2: Update Thunderbolt and Chipset Drivers

Outdated drivers are a frequent cause of Thunderbolt 4 devices not working. According to Microsoft Q&A experts, updating to the latest Thunderbolt and chipset drivers can resolve many issues[reference:17].

1. Visit your PC or motherboard manufacturer’s website (Dell, Lenovo, ASUS, MSI, Gigabyte, etc.).
2. Search for your specific model and navigate to the drivers/downloads section.
3. Download and install the latest:
   • Thunderbolt Controller Driver
   • Chipset Driver
   • USB4 Host Router Driver (if available)
4. Restart your PC after installation.
5. Test your Thunderbolt device.

Method 3: Uninstall and Reinstall Thunderbolt Drivers

According to Samsung’s support documentation, after a Windows update, the Thunderbolt device driver may be reset, causing a yellow exclamation mark in Device Manager[reference:18]. Uninstalling and reinstalling the driver can resolve Thunderbolt 4 devices not working.

1. Open Device Manager (right-click the Start button and select “Device Manager”).
2. Expand “System devices” and look for “Thunderbolt(TM) Controller” with a yellow exclamation mark[reference:19].
3. Right-click the Thunderbolt controller and select “Properties”.
4. Go to the “Driver” tab and click “Uninstall Device”.
5. Check “Delete the driver software for this device”, then click “Uninstall”[reference:20].
6. Restart your PC.
7. Reinstall the Thunderbolt driver:
   • Use Windows Update (Settings > Windows Update > Check for updates).
   • Or download and install the driver from your PC or motherboard manufacturer’s website[reference:21].
8. Restart your PC and test your Thunderbolt device.

Method 4: Check Device Manager for Errors

If Thunderbolt 4 devices not working, Device Manager can provide specific error codes that help identify the problem. According to multiple sources, the yellow bang (exclamation mark) is a common indicator[reference:23][reference:24].

1. Open Device Manager (right-click Start > Device Manager).
2. Look for any devices with a yellow exclamation mark under:
   • “System devices” (Thunderbolt Controller)
   • “Universal Serial Bus controllers” (USB4 Host Router)
   • “Other devices” (unknown Thunderbolt devices)
3. Right-click the problematic device and select “Properties”.
4. Check the “Device status” for an error code:
   • Code 52 – “The driver cannot be initialized”[reference:25]
   • Code 10 – “The device cannot start”
   • Code 45 – “Not currently connected”
5. For Code 52, try uninstalling and reinstalling the driver (see Method 3).
6. For Code 10, check BIOS settings (see Method 1).

Method 5: Use a Certified USB4/Thunderbolt Cable

According to Microsoft’s support documentation, using an uncertified or low-quality cable is a common cause of connection issues[reference:26]. Microsoft recommends using the cable provided by the device manufacturer or a certified USB4 cable[reference:27].

1. Check the cable you are using—is it the original cable that came with your device?
2. Look for certification logos on the cable (USB4 or Thunderbolt certification).
3. Try a different cable—preferably one from a reputable brand with Thunderbolt 4 or USB4 certification.
4. Test with a shorter cable if possible, as longer cables can cause signal degradation.
5. Connect your Thunderbolt device directly to your PC (not through a hub) to eliminate additional points of failure[reference:28].

Method 6: Disable PCIe Link State Power Management

According to a Microsoft Q&A solution, PCIe Link State Power Management can interfere with Thunderbolt connections[reference:29]. Disabling this feature can resolve Thunderbolt 4 devices not working caused by power management conflicts.

1. Open Control Panel and go to “Power Options”.
2. Click “Change plan settings” next to your active power plan.
3. Click “Change advanced power settings”.
4. Expand “PCI Express” and then “Link State Power Management”.
5. Set it to “Off” for both “On battery” and “Plugged in”.
6. Click “Apply” and “OK”.
7. Restart your PC and test your Thunderbolt device.

Method 7: Check USB4 Connection Manager Settings

Windows 11 includes a USB4 Connection Manager that controls how USB4 and Thunderbolt devices are managed[reference:31]. Checking these settings can help diagnose Thunderbolt 4 devices not working.

1. Open Settings (Windows + I).
2. Go to “Bluetooth & devices” > “USB”.
3. Look for “USB4” settings. If available, you can see connected USB4 hubs and devices[reference:32].
4. Check if your Thunderbolt device is listed—if it appears but shows “limited functionality,” there may be a driver or firmware issue.
5. If no USB4 settings are visible, your PC may not support USB4/Thunderbolt, or drivers may not be installed correctly.
6. Ensure “USB4 Host Router” appears in Device Manager without errors.

Method 8: Roll Back Recent Windows Updates

According to multiple reports, recent Windows 11 updates have caused USB4/Thunderbolt malfunctions[reference:33]. If your Thunderbolt 4 devices not working started after a Windows update, rolling back the update may resolve the issue.

1. Open Settings (Windows + I).
2. Go to “Windows Update” > “Update history”.
3. Scroll down and click “Uninstall updates”.
4. Find the most recent update (look for updates installed around the time the issue started).
5. Select the update and click “Uninstall”.
6. Follow the on-screen instructions and restart your PC.
7. Test your Thunderbolt device.

Method 9: Perform a Power Drain

According to Microsoft Q&A experts, performing a power drain can reset the Thunderbolt controller and resolve Thunderbolt 4 devices not working[reference:35].

1. Power off your PC and unplug it from the wall.
2. Remove the power cable from the laptop or desktop power supply.
3. Press and hold the power button for 15-20 seconds to drain any residual power[reference:36].
4. Wait 30 seconds, then plug the PC back in and power it on.
5. Connect your Thunderbolt device and test.

Conclusion: Resolving This Thunderbolt/USB4 Issue

When Thunderbolt 4 devices not working occurs, start with the simplest fixes: check your BIOS settings, update your drivers, and use a certified cable. Most cases of this issue resolve with these steps. If the problem persists, uninstall and reinstall the Thunderbolt driver, disable PCIe Link State Power Management, or check USB4 Connection Manager settings. For more stubborn cases, roll back recent Windows updates or perform a power drain. By following this guide, you can resolve Thunderbolt 4 devices not working and restore full connectivity to your high-speed peripherals.

Frequently Asked Questions