Call of Duty Modern Warfare comes with its fair share of errors and problems that many players are now starting to face. The ‘DEV ERROR 6165’ lists such errors that are reported to appear whenever a user runs Modern Warfare, starts the campaign, or joins a multiplayer match.

To get to the bottom of the issue, it was discovered that the ‘DEV ERROR 6165’ usually appears due to server problems. At other times it was due to game folder or file corruption and interruption from third-party software. Moreover, it was also observed that outdated and corrupted GPU drivers led to the occurrence of ‘DEV ERROR 6165’.

Fix #1: Check Server Status

First, you must rule out whether there are any issues with the server before heading to any other fix to resolve the‘DEV ERROR 6165’ in Call of Duty Modern Warfare.

Suppose you are experiencing the DEV ERROR 6165, particularly during connecting to Activision’s servers while launching Modern Warfare. In that case, the root cause of the ‘DEV ERROR 6165’ is likely a problematic server.

To further confirm your suspicion, you can check out Activision’s status page to see if the server is officially down or not. Open the page, head to the drop-down menu, and select Call of Duty: Modern Warfare. Then, check the status page to see any announcements of a down server or green checkmarks.

It is also very likely that the platform you’re playing Call of Duty: Modern Warfare on (Steam, Epic Games, or Battle.Net) particularly is having issues, leading to the ‘DEV ERROR 6165’. Click on the platform icon under Server Status by Network to confirm the status. In case there are any issues are detected, then all there’s left for you to do is wait for the server or the platform to get back to normal.

Fix #2: Scan and Repair

In case of a corrupt game file leading to the ‘DEV ERROR 6165’ in Call of Duty Modern Warfare, you’ll need to perform a scan and repair to weed out the problems. Call of Duty Modern Warfare launcher (Battle.Net) has a great scan and repair tool to do that, so you need not worry.

First, make sure Call of Duty Modern Warfare, and other processes are closed from the background. Then, launch the Battle.Net app and click Games Tab. Head to Options > Scan & Repair. Confirm and click Start Scan. When the process is over, restart your computer and then launch Call of Duty Modern Warfare.

Fix #3: Run The Game In Clean Boot Mode

Another fix to get rid of ‘DEV ERROR 6165’ in Call of Duty Modern Warfare is performing a clean boot, which restarts the system with minimal drivers and start-up tasks, thereby reducing the chances of ‘DEV ERROR 6165’.

To do so, launch the Run box by pressing the Windows and R keys simultaneously, type “msconfig” and press Enter. Then, click on Services and check the Hide all Microsoft services option. After that, click on Disable All. Head to the Startup tab and click on Task manager.

On the window, right-click on all programs one by one and disable them. Now head to System Configuration and click on Apply, and then OK. Restart your system as a final step, and then later relaunch Call of Duty Modern Warfare.

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Fix #4: Force The Game To Run With DirectX11

The ‘DEV ERROR 6165’ in Call of Duty Modern Warfare also appears if a user has a medium-tier GPU struggling to render Direct X12 games. In such cases, it is better to opt for this fix, even though it will cause minor visual changes in the game.

To force Call of Duty Modern Warfare to run with DirectX 11, first close the game in the background. Then, open the Battle.net client and sign in. Click on the Call of Duty title from the Library and click on Options. Then select Game Settings and ensure Game Settings is selected from the vertical menu. Then, check the box next to “Additional Command Line Arguments.” and type “-d3d11”. Then, save the changes and then launch Call of Duty Modern Warfare.

Fix #5: Run Call of Duty Modern Warfare in Windowed Mode

Oftentimes, when users run Call of Duty Modern Warfare in fullscreen mode, it leads to ‘DEV ERROR 6165’. It might sound undoable but for some users, reconfiguring the game to run in the windowed mode helped them resolve the ‘DEV ERROR 6165’.

To run Call of Duty Modern Warfare in windowed mode, launch the game like you usually do through Battle.Net and head to the game’s main menu. Then go to Settings and then to the Graphics sub-menu.

Now, click on Display and then on Display Mode. Select Windowed from the list of options and save the changes. Hopefully, the ‘DEV ERROR 6165’ will now no longer appear.

We hope that one of the above fixes did the trick for you in resolving the ‘DEV ERROR 6165’. If you are facing errors and issues with other PC games or your PC, then also see our hub for commonly occurring PC errors and their fixes.

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