[Fixed] Call of Duty: Warzone Dev Error 6661

Call of Duty Warzone
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You must have updated Call of Duty: Modern Warfare or Warzone to enjoy its gameplay. However, while you were all excited to enjoy its latest features and within a short time, the dev error 6661 is causing an obstruction.


If you cannot play it, you should know how to tackle it. We have covered you all with how you can fix dev error 6661. 

What Causes Warzone Dev Error 6661? 

Warzone Dev Error 6661

The “Dev error 6661” is an error message you often encounter when playing Call of Duty: Modern Warfare or Warzone. Its potential reason is an issue with the game’s configuration or the system’s hardware. There are several causes for this error, including:

  • Outdated graphics drivers: It is vital to keep your graphics drivers up to date to ensure optimal game performance. Outdated drivers can cause various issues, including the Dev error 6661. Alternatively, improperly configured GPU settings can also cause it.
  • Corrupted Game files: If some of the game’s files are corrupted or damaged, it causes Dev error 6661. Try repairing the game files through the game’s launcher. 
  • Hardware issues: If your system does not meet the minimum hardware requirements, it can cause Dev error 6661. 
  • Overclocking: If you have overclocked your system’s hardware, it can cause stability issues to the Dev error 6661. Try resetting your hardware to its default clock speeds and see if that resolves the problem.
  • Outdated Firmware: Make sure that your firmware is up to date. It’s because obsolete firmware can cause various issues with games.

Now let’s dig into its solutions! 

How to Fix Dev Error 6661?

There are several reasons for the dev error 6661. Despite their causes, we have the solution to all of them. Amongst the many methods, try each one sequentially until you get one that works depending upon its cause. 

Method 1: Reboot  your Device

Temporary problems in the game also lead to dev error 6661. The simplest solution to fix it is to close the game and open it again. Another effective solution is to reboot your devices, like a PC or PlayStation, and then try again.


If that doesn’t help, then power cycle your device. For it, switch off your device, disconnect the power cord for 30 seconds, plug in the cord, and turn on the device now. You would have fixed Dev Error 6661 if temporary issues were the reason. 

Method 2: Fix the Internet Connection

A poor internet connection results in several problems with the gameplay. It’s because the game is not unable to connect with the server. Therefore, all you have to do is reestablish an internet connection on your device.

If that doesn’t work, perform an internet speed test by visiting here. Further, restart your router or contact your ISP if the internet is unstable. Otherwise, if there are no internet issues, the following method might help. 

Method 3: Check Server Status

There might be situations where the issue is not on your end, but the back-end issue leads to the dev error 6661.

The Call of Duty game servers at some locations might be under maintenance. In such a situation, all you have to do is wait till the maintenance completes.

Warzone Server Status - Warzone Dev Error 6661

To check the Call of Duty game server status, visit here

Method 3: Run Call of Duty as Administrator

Call of Duty: Warzone would report the dev error 6661 if it lacks certain privileges to run the game optimally. This applies to you if you run the game on Windows. Therefore, run the game as administrator for those special privileges. 

Here’s how you can run Call of Duty as an Administrator:

Step 1: Right-Click on the Call of Duty game logo and select Properties from the drop-down menu.

Step 2: Navigate to Compatibility


Step 3: Click on the Run this program as an administrator checkbox. 

Step 4: Press the Apply button and press the OK button to save changes.

Run Call of Duty as Administrator - Warzone Dev Error 6661

When you run the game as administrator, then it grants special permission to run the game. It will fix the issue, but if it does not help, there will be missing or broken game files. The following method will be your rescue, then.

Method 4: Repair Call of Duty Game Files 

The ultimate solution to fix missing or broken game files is to repair them. Battle.net launcher has the option to scan its game files.

Doing so, check whether the files are complete or not, whether they are corrupt or not. In either of the cases, the repair option helps resolve it.


Follow the steps given below to repair Call of Duty game files:

Step 1: Head over to the Battle.net launcher.

Step 2: Navigate to Call for Duty and click on Settings (gear-shaped icon). 

Step 3: Select Scan and Repair and click the Begin Scan button.

Warzone Scan and Repair - Warzone Dev Error 6661

Thus, dev error 6661 would not be an issue after fixing the game files. If the problem persists, then outdated games are the leading cause. 


Method 5: Update Call of Duty 

Your game version might have bugs leading to several errors, like the dev error 6661. Therefore, game developers frequently release updates that fix bug patches. Accordingly, update your game if it’s outdated. 

Follow the steps given below to update Call of Duty on PC:

Step 1: Go to Battle.net launcher, click on its logo and navigate to Settings

Step 2: Select Game Install/Update and click on the Apply latest updates and download future patch data for recently played games checkbox to enable it. 

Step 3: Select Done to save your settings.


Now, again open the launcher to install updates, if any. Additionally, if the option was already enabled or your game is not outdated, then DirectX might encounter an issue. The below method will help you get rid of it. 

Method 6: Play Call of Duty with DirectX11

When your Call of Duty: Warzone runs with DirectX12, the probability of errors dev error 6064, 6661, and similar is common. This is because some users have reported a bug in Dx12.

Therefore, you should run COD in DirectX11 to eliminate the error message. 

Follow the steps given below to play Call of Duty: Warzone with DirectX11:

Step 1: Head over to the Battle.net launcher.


Step 2: Go to COD and tap on the Gear icon near it.

Step 3: Select Game Settings from the menu and enable the Additional command line arguments option.

CoD Warzone DX11 - Warzone Dev Error 6661

Step 4: In its text box, enter -d3d11 and press the Done button to save your settings 

Now, whenever you play Warzone, it will run with DirectX 11. 

Method 7: Delete Warzone Temporary Files 

Your PC would have a folder that stores Warzone’s temporary files. These often interrupt the gameplay leading to the dev error 6661. Therefore, deleting those will resolve the issue. It keeps all of them in a folder with a ‘temp’ name.


Follow the steps given below to delete Warzone Temporary files:

Step 1: Press the Win+R keys simultaneously and enter %temp% in the text field

RUN-temp - Warzone Dev Error 6661

Step 2: Select all the contents of the folder and press the Delete key on. your keyboard

Thus, after deleting the files, your issue will be resolved. While you use a GPU, misconfigured settings can also be problematic. The below method will help you tackle it.

Method 8: Optimize NVIDIA GPU Settings for Call of Duty: Warzone

Improper GPU settings also cause bugs leading to the dev error 6661. Therefore, to resolve it, you should optimize your graphical settings.


Here’s how you can do so:

Step 1: Open NVIDIA GeForce Experience

Step 2: Navigate to Call of Duty and check its options. 

Step 3: Select Details and click on the Optimize label.

CoD GeForce Experience Optimize - Warzone Dev Error 6661

This will optimize the GPU Settings and resolve your issue. 


Method 9: Update your Device Firmware 

Ensure that your device firmware is outdated. Else, that too can lead to the dev error 6661. Therefore, you should update your Windows OS or PlayStation console firmware to avoid the error. 

Method 10: Reinstall Call of Duty: Warzone 

When nothing seems to help, reinstalling the game is the ultimate solution. 

Here’s how you do so:

Step 1: Go to the Battle.net launcher and open all Games

Step 2:  Press the options button near Call of Duty: Warzone and select Uninstall.

Uninstall Warzone - Warzone Dev Error 6661

Step 3: After the uninstall finishes, reinstall the game 

If you are experiencing Dev error 6661 and none of the above solutions have helped, you may want to try contacting the game’s support team for further assistance.

Frequently Asked Questions 

Why does my Call of Duty keep saying Dev error?

One of the reasons behind the dev error is the lack of administrative permissions. You can run COD as administrator to resolve it. You can also check for server outages or fix broken game files.

What is a Dev error on Xbox?

The Dev error on Xbox happens due to corrupt firmware. You can update the firmware or reset your Xbox to fix it.

The Final Words

The Dev error 6661 is an issue you would encounter after updating the game. If another update does not help, you should try the above mentioned methods. Updating your firmware, modifying GPU settings, and other tweaks would help you resolve it. 

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