Navigating Through the Code 45 Error: A Guide for 802.11n Wireless LAN Users


“Could you provide expert guidance on resolving a persistent Code 45 error with an 802.11n Wireless LAN Card? Despite occasionally powering on, it quickly defaults to this error in the device manager. I’ve diligently followed all recommended troubleshooting steps for over a month without success. What solutions would you suggest to address this issue?”


Resolving the Code 45 Error in 80


11n Wireless LAN Cards

Encountering a Code 45 error can be frustrating, especially when it persists after following standard troubleshooting procedures. This error typically indicates that the hardware device is not connected to the computer, which can be perplexing if you haven’t made any changes to the hardware setup.

Before delving into solutions, it’s essential to understand what Code 45 entails. In the realm of device manager errors, Code 45 is specific to scenarios where the system believes the hardware is not connected. This could be due to physical disconnection, driver issues, or hardware failure.

Troubleshooting Steps


Check Physical Connections

  • Ensure that the wireless card is properly seated in its slot.
  • If possible, test the card in another computer to rule out a hardware failure.
  • 2.

Update Device Drivers

  • Visit the manufacturer’s website to download the latest drivers for your wireless card.
  • Alternatively, use the device manager to check for driver updates online.
  • 3.

System Restore

  • If the issue started recently, perform a system restore to a point when the wireless card was functioning correctly.
  • 4.

Windows Troubleshooter

  • Run the built-in Windows troubleshooter for hardware and devices to find and fix issues automatically.
  • 5.

Registry Check

  • Use caution with this step. Incorrect changes to the registry can cause serious system problems.
  • Navigate to `HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4d36e972-e325-11ce-bfc1-08002be10318}` and delete any entries named `UpperFilters` or `LowerFilters`.
  • 6.

Power Management Settings

  • In the device manager, under the properties of the wireless card, navigate to the Power Management tab.
  • Uncheck the option “Allow the computer to turn off this device to save power.”
  • 7.

Hardware Troubleshooting

  • If none of the software solutions work, the issue might be with the hardware itself.
  • Consider replacing the wireless card if it’s determined to be faulty.

Expert Advice

If you’ve exhausted all the above steps without success, it may be time to consult with a professional technician. They can provide a hands-on diagnosis and potentially identify issues that are not apparent through remote guidance.


The Code 45 error is a challenging one, but with methodical troubleshooting, it’s often possible to resolve. Remember to back up your data before making any significant changes to your system, and proceed with caution when making adjustments to hardware or system settings.

By following these steps, you should be able to address the Code 45 error with your 80


11n Wireless LAN Card. If the problem persists, seeking expert hands-on assistance is the recommended course of action.

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