How to fix DEV ERROR 6066 in Call of Duty MW/Warzone?


Dev Error 6066 occurs when Call of Duty: Warzone players try to launch the game on PC or when they are in the middle of a multiplayer match. The issue is PC exclusive and is confirmed to appear on both Windows 10 and Windows 11.

Dev Error 6066

Before troubleshooting, you should first make sure your GPU has enough VRAM to support COD Warfare rendering. If your system specs are good enough, other potential causes include possible third-party interference, game file corruption, outdated GPU drivers, unstable overclocking, or a situation where a second monitor forces the game to run on the integrated GPU.

Here are several confirmed fixes that should help resolve the issue:

1. Check the minimum specs

Before moving on to all the other confirmed fixes below, start by comparing your PC specs with the Call of Duty Warzone minimum requirements.

Start by looking at the image below and check if you meet the minimum GPU, CPU, RAM, HDD and network requirements.

Minimum requirements for Call of Duty
Minimum requirements for Call of Duty

If everything looks good, dive deeper into your GPU specs before moving on to the next method below.

One of the most common causes that trigger this 6066 DEV error is insufficient VRAM.

To note: Remember that VRAM is a special type of RAM designed specifically for the GPU. It has nothing to do with normal RAM.

Call of Duty Warzone requires a minimum of 2 GB of VRAM to work properly on Windows 10 and Windows 11. If your GPU is below this threshold, you will not be able to get past the 6066 DEV error even if you follow all the other fixes presented below.

Here is a quick guide to check the available VRAM on your current GPU:

  1. press the Windows key + R to open a To run dialog box.
  2. Then type ‘dxdiag’ in the text box, then press Ctrl + Shift + Enter to open the DirectX diagnostic tool with administrator access.
    Open the DirectX Diagnostic Tool
    Open the DirectX Diagnostic Tool
  3. Click on Yes to grant administrator access when User Account Control (UAC) is requested.
  4. Inside of DirectX diagnostic tool, use the vertical menu at the top to click on Display 1 (or the main screen you use when trying to play the game).
  5. With the main display selected, go to Device and check the Display memory count.
    Checking available display memory
    Checking available display memory

    To note: If the display memory count is over 2000MB, you are above the threshold and your GPU should be able to handle the game. Otherwise, you will not be able to play the game unless you upgrade to a better one. GPUs. There are modded drivers that might help you if you are just below the limit but our recommendation is to avoid them as most of them are riddled with malware and the gaming experience will be poor as your specs are below the recommended values.

If your GPU has enough VRAM available to play the game, but you are still encountering the 6066 DEV error, proceed to the first fix below.

2. Perform a Clean Boot

Call of Duty Warzone can be affected by a wide variety of third-party programs, which makes it difficult to identify the exact cause of the problem. Top of the list are overlay programs, system optimization suites, and overprotective security suites.

For this reason, the best course of action is to find the culprits by restarting your computer in clean mode and determining if the problem is still present.

To note: A clean boot will force your PC to boot without third-party services and processes.

If the problem no longer occurs in clean boot mode, it is clear that a third-party process or service is causing the 6066 DEV error.

For step-by-step instructions on how to achieve Clean Boot State on Windows 11, follow the steps in this article. If you are still on Windows 10, use this guide instead.

Achieve a clean boot state
Achieve a clean boot state

Once a clean boot state is reached, launch COD Warzone and see if the problem persists.

If you can launch the game normally, start re-enabling any third-party processes you previously disabled until you’ve managed to identify the culprit.

If the problem persists even when you clean boot, proceed to the next method below.

3. Scan and Repair Call of Duty: Warzone

If you have already made sure that there is no interfering process or service causing this problem, the next thing you need to troubleshoot is potential file corruption affecting the game.

Fortunately, you can use the Scan and Repair feature on Battle.Net to scan and repair your game installation folder in case it is affected by file corruption. This will examine each game file and associated dependency and replace each corrupted file with a clean equivalent.

Follow the instructions below to start a Warzone game repair procedure using the Battle.Net settings:

  1. Make sure Call of Duty is disabled and does not run in the background.
  2. Open Battle.Net and log in with the username and password associated with the game.
    Log in to your account
    Log in to your account
  3. On the left side of the main screen Battle.Net interface, choose the game you want to choose.
  4. Select Scan and Repair of Settings (the gear symbol) to verify the integrity of the file and fix Call of Duty (from the context menu that just appeared).
    Scan and Repair Warzone
    Scan and Repair Warzone
  5. Confirm the procedure on the next screen, then wait patiently for the scan and repair to complete.
    When the process is complete, restart the game to see if the issue has been resolved.

If the problem persists, scroll down to the next suggested solution below.

4. Unplug the second monitor (if applicable)

If you’re using a dual-monitor setup, you can expect to fix this issue when running the game on one monitor using the integrated GPU (instead of the dedicated solution).

This issue is common with laptop models that are automatically wired to use the dedicated GPU on the primary display and the integrated GPU on the secondary display. If you have configured the game to run on the secondary display on a configuration like this, you will most likely encounter error 6066 because the integrated GPU does not have the VRAM required to render the game.

A simple solution in this particular case is to unplug the secondary screen. This will automatically force the game to the most powerful GPU available.

Disconnect the secondary screen
Disconnect the secondary screen

To note: If this method is successful, reconfigure the game to run on your primary display, so that the primary GPU is used.

If this fix was not applicable or did not resolve the issue, proceed to the next method below.

5. Update the GPU driver to the latest version

If it’s been a while since you’ve updated your GPU drivers, you may be seeing error code 6066 DEV because you are missing a new physics module dependency required by Call of Duty Warzone.

This issue is confirmed to occur with Nvidia and AMD graphics cards.

If you are getting this error a few seconds after launching the game, it is likely that your GPU drivers are outdated and the game cannot run without the required dependencies.

You can fix this problem by updating both the GPU drivers and the physics module that controls how the game works.

If you haven’t updated your GPU drivers recently, remove your current GPU drivers and reinstall the latest ones before trying to run COD Warzone again:

  1. press the Windows key + R to open the To run box.
  2. Type “devmgmt.msc” in the run text box and press the Walk in key to get to Device Manager.
    Open Device Manager
    Open Device Manager
  3. Once you are in Device Manager, scroll down the list of installed devices to expand the drop-down menu for Screenshot taken.
  4. Update the driver by clicking Update Driver after right clicking on your GPU card.
    Update GPU Driver
    Update GPU Driver

    To note: If your computer has both a dedicated GPU and an integrated GPU, you need to update the drivers for both.

  5. Choose the option “Automatically search for new driver software” from the wizard that just appeared.
    Automatic driver search
    Automatic driver search
  6. If the scan is complete and a new version of the driver is recommended, follow the on-screen instructions to install it via Device Manager.
  7. Restart your computer and relaunch COD: Warzone and see if Dev Error 6066 is now fixed.To note: If Device Manager was unable to find a new version of the GPU driver, you will need to use the proprietary software that came with your graphics card to update your current graphics drivers. Use one of the following tools depending on whether you have an NVIDIA or AMD graphics card:
    GeForce Experience -Nvidia
    Adrenaline – AMD

If the same kind of problem persists or your GPU drivers are already up to date, proceed to the next method.

6. Revert overclocking (if applicable)

If you are using MSI Afterburner (or similar overclocking software) and have overclocked your GPU, you may get COD Warzone 6066 DEV error because your system is unstable.

If you actively overclock your GPU, you may be able to fix the problem by reverting all overclocked frequencies to their original settings.

If you use MSI Afterburner, you can get rid of the profiles you created earlier.

To note: Before deleting the profiles you have created in the MSI Afterburner application, take a screenshot or write down the settings you have made in case you need them later.

Follow the steps below to undo any GPU overclocking done in MSI Afterburner:

  1. Open File Explorer and go to the disk where you installed MSI afterburner. Then go to Program files (x86) folder (or wherever you installed the app).
    Access the Program Files menu
    Access the Program Files menu
  2. Open the MSI Afterburner Folder and go to Profiles folder.
    Access the Profiles menu
    Access the Profiles menu
  3. Choose all files inside the Profiles folder and delete them.
    Removed content from the Profile menu
    Removed content from the Profile menu
  4. Now restart your computer to allow the overclocked values ​​to return to their defaults and see if the 6066 DEV error is fixed.

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