Fix Call of Duty Modern Warfare Warzone Dev Error 1109

Have you been struggling with the Call of Duty Modern Warfare Warzone Dev Error 1109 after a recent update to the game. Don’t worry, you are not alone in this, thousands of players have been facing the same problem, which is good news. This has enabled us to present you with a list of solutions that can potentially fix the dev error.

Contents

Fix 1: Disable Windows Defender and Reinstall the Game Fix 2: Update the GPU Fix 3: Install Nvidia Studio Driver Fix 4: Scan and Repair with Battle.net Desktop Client Fix 5: Delete Battle.net Cache Files Fix 6: Update Windows to the Latest Build Fix 7: Turn off Nvidia, Steam, and Discord Overlay Disable Steam Overlay Disable Discord Overlay

Check out our other Dev Error Guides – 6328, 6065, 6178, and 263234

Fix 1: Disable Windows Defender and Reinstall the Game

Uninstalling and reinstalling the game has resolved the error for quite a number of users. As a method of troubleshooting, you probably have already tried uninstalling and reinstalling the game. However, some users were able to resolve the error after multiple attempts and uninstall and reinstall.

Even before I suggest this fix, I am well aware of the large file size and the pain it takes to download the game all over again. But given the large number of users who claim reinstalling the game fixes the problem I think it’s worth the try. You don’t want your money to go to waste because of a silly error.

However, before you reinstall the game disable the Virus & threat protection. After you have installed the game, try playing it and if the Call of Duty Modern Warfare Warzone Dev Error 1109 does not make an appearance, set an exclusion for the game folders in the Virus & threat protection.

Fix 2: Update the GPU

Both Nvidia and AMD regularly release updates for their graphics card that can have a potential hotfix for a range of Call of Duty errors. If you are still using the outdated or old driver, install the latest drivers either by directly downloading from the official website or the GeForce Experience for Nvidia users. Under most circumstance, the Warzone dev error 1109 will be fixed by updating the drivers. It’s recommended that you perform a manual install i.e. go to the manufacturer’s websites and download the latest copy and install. Once the install is complete, restart the PC to apply the changes and play the game.

Fix 3: Install Nvidia Studio Driver

If your gaming rig is running on an Nvidia GPU, simply installing the Nvidia Studio driver instead of the Game Ready driver can fix the problem. As we explored various forums to find a resolution to this problem, we came across a number of users who resolved this error by simply installing the other Nvidia driver.

Our guess is that the Studio drivers have some hotfix that addresses this issue. However, this is not yet a fully-tested driver, so you may encounter other errors with COD or other games. Regardless, if you want to give it a try, here is how you can do it.

If your system does not have the GeForce Experience, you need to download and install it first. Click on the link to download the latest version of GeForce Experience.

Install the GeForce Experience.
If you don’t have an account, follow the onscreen instructions to register and sign-in.
Click on DRIVERS on the top-right corner.
Then, click on CHECK FOR UPDATES on the top-left corner.
Click on the three-dots next to CHECK FOR UPDATES and toggle-on Studio Driver.
Now the Studio driver should be available for Download, click on the DOWNLOAD button in green.
Once the download is complete, choose EXPRESS INSTALLATION and follow the on-screen prompts to complete the installation. (If prompted grant administrative privileges).
After the installation completes, restart the system and check if the Call of Duty Modern Warfare Warzone Dev Error 1109 is still visible.

Fix 4: Scan and Repair with Battle.net Desktop Client

The Battle.net desktop client is a useful resource to fix minor problems with the game and often it’s the minor fix that works. So, let’s utilize the Scan and Repair feature of the Battle.net client. Here is how you can do it.

Open the Battle.net client using the desktop shortcut.
Open the game COD MW by clicking on the icon.
Click Options > Scan and Repair > Start Scan.

Wait for the process to complete and check if the Warzone dev error 1109 is still visible or not.

Fix 5: Delete Battle.net Cache Files

Another fix for Battle.net users that relates to corrupted game files. If your game files have been corrupted that can be a possible cause for Modern Warfare 1109 error. Users who removed the cache files from Battle.net resolved this error for good. Here is how you can navigate to the Blizzard Entertainment folder and delete the cache files.

Close all the games running in Battle.net.
Open the Run dialogue by pressing Windows Key + R.
Type %programdata% and hit enter.
Open the folder named Blizzard Entertainment andgo to Battle.net > Cache.
Press Control + A, right-click and select Delete
Ensure every item in the folder is deleted.

Once you have performed the above steps, restart the computer and check if the dev error 1109 appears.

Fix 6: Update Windows to the Latest Build

Updating the Windows OS to the latest built has also fixed the problem for a lot of users. So, go to Windows Update and Security and check for updates, if available, update the OS and try playing the game.

Fix 7: Turn off Nvidia, Steam, and Discord Overlay

“The GeForce Experience in-game overlay enables you to access GPU-accelerated video recording, screen-shot capture, broadcasting, and cooperative gameplay capabilities.” This feature can interfere with the game graphics and cause the Warzone dev error 1109. You can disable the Overlay for Nvidia graphics card through the GeForce Experience to fix the problem.

Launch the GeForce Experience Application
Click on the settings Gear icon on top-right
From the General tab, under Features, locate and disable IN-GAME OVERLAY.