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How To Fix Modern Warfare 2 Dev Error 11557 – everything you to need know

Modern Warfare 2 was developed by Infinity Ward, and published by Activision. Dev Error 1155 is a frustrating error that players encounter despite the massive success of the game. This error has caused users to stop playing the game.

This article will walk you through how to fix Dev Errors 11557 and get you back in the game as quickly as possible. The following topics will be covered:

Understanding Dev Error 11557

What is Dev error 11557?

Dev Error 1155 is a common error in Modern Warfare 2 that causes crashes and freezes. This error code usually appears when the game is first launched or when you try to join a multi-player match. This error code is usually accompanied by a message that says “Fatal Error Dev Error 1155”.

Causes of Dev error 11557

This error has no known cause, but it is caused by several factors. Included are:

  1. Old graphics drivers
  2. Game files corrupted
  3. Insufficient system resources
  4. Overclocked hardware
  5. Third-party software interception
  6. DirectX or Visual C++ redistributable issues

How to Fix Dev Error 1155

We recommend that you try the following solutions to fix Dev Error 1155. You may not have to complete all these steps. The error could be fixed after you’ve completed one or more.

1. Update graphics drivers

Dev Errors 11557 can be caused by outdated graphics drivers. Follow these steps to update your drivers:

  1. Type “Device Manager”, in the Windows search box, and click on the result.
  2. Expand the “Display Adapters” category.
  3. Click on the graphics card, and then click “Update Driver”.
  4. Follow the instructions on the screen to finish the update.

You can also visit the website of your graphics card manufacturer (NVIDIA AMD or Intel) to download the latest drivers for your graphics card model.

2. Modern Warfare 2, Repair or Reinstall

Dev Error 11557 can be caused by corrupted game files. You can fix the error by either repairing game files or reinstalling Modern Warfare 2. Here’s how:

Repair Game Files:

  1. Launch the Battle.net app.
  2. Choose “Modern Warfare 2”, from the menu on the left.
  3. Select “Scan and repair” by clicking on the gear icon beneath the title of the game.
  4. Click “Begin Scan”, and wait until the process is complete.

Install Modern Warfare 2.

  1. Battle.net will open.
  2. Choose “Modern Warfare 2”, from the menu on the left.
  3. Uninstall the game by clicking on the gear icon located below the title.
  4. Uninstall the program by following the instructions on the screen.
  5. Click “Install” after the game has been uninstalled to reinstall Modern Warfare 2

3. Optimize System Resources

Dev Error 115557 can be caused by insufficient system resources. Follow these steps to optimize your system resources:

  1. Close all unnecessary programs running in the background.
  2. Open the Task Manager by pressing Ctrl+Shift+Esc.
  3. Click on “Processes”.
  1. Sort the processes according to CPU and memory usage.
  2. Click on the “End Task” option when you right-click any processes that consume a lot of resources but are not necessary for your system.
  3. Start Modern Warfare 2 again and see if the problem persists.

4. Reset Overclocked Hardware

Dev Errors 11557 and other errors can be caused by overclocked hardware. Reset your CPU, RAM or GPU to default settings if you’ve overclocked them. You can do this through your BIOS, the graphics card control panel or third-party software.

5. Disable third-party software

Dev Errors 11557 can be caused by third-party software such as firewalls, antivirus programs or performance optimizing tools. Close or temporarily disable these programs prior to launching the game. This will allow you to determine if the problem is this. Re-enable these programs after you have finished playing the game to keep your system protected.

6. Update Visual C++ and DirectX Redistributables

Dev Errors 11557 can be caused by outdated DirectX and Visual C++ Redistributable Files. Follow these steps to update these components:

Update DirectX :

  1. Visit the Microsoft DirectX download page: https://www.microsoft.com/en-us/download/details.aspx?id=35
  2. Install the latest DirectX version by clicking “Download” on the screen and following the instructions.

Update Visual C++ redistributables:

  1. Visit the Microsoft Visual C++ Redistributable download page
  2. Install the latest Visual C++ packages that are compatible with your operating system (32 or 64 bit).

Restart your computer after updating DirectX or Visual C++ Redistributables. Then launch Modern Warfare 2 to check if you have resolved the issue.


Modern Warfare 2’s Dev Error 1155 can be frustrating, but the solutions in this article should help you fix the problem and enjoy the game again. You may not have to complete all the steps, since the error might be fixed after you’ve completed one or two.

If Dev Error 1155 still persists after you’ve tried these solutions, contact Activision for additional assistance.


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