Modern Warfare 2: Dev Error 356 [FIXED]

The dev error 356 error code in MW2 can be tricky to resolve but we have prepared a list of working fixes for it

Story Highlights
  • The Dev error 356 in COD Modern Warfare 2 can seemingly generate out of the blue for many players
  • It is linked to the language being other than the default English or it may be due to corrupted or missing game files
  • Players can opt to overcome the issue by verifying the game files or implementing a VPN to test the game out
  • The issue has been a general recurrence since the previous Modern Warfare so it is no surprise that it's managed to arrive in the sequel too

Call Of Duty Modern Warfare 2, or MW2, has certainly trailblazed its way into the market as the game is easily the best-selling COD of all time, but that doesn’t help with the fact that it has game-breaking issues such as the Dev error 356, which can be annoying to deal with for many players. The error is correlated with the language packs of the game, but assumingly, it can also occur randomly at any instance whilst playing the game.

The game is currently at the top of the sales chart on Steam, but these kinds of ridiculous issues have certainly caused a fuss among the player base. But thankfully, we have prepared a detailed guide on how to fix the problem, so join us as we discuss the exact methods needed to overcome the dev error 356 in MW2.

How To Fix The Dev Error 356 In Call Of Duty MW2

Upon further speculation, the issue seems to be connected through the main directory files, which may be corrupted or need repair. It may also arise due to improper bandwidth speeds from your internet connection which can be the last fix you can try to resolve the issue if all else may fail. Regardless of which, we have scoured the various communities of the game to compile together a list of working fixes to the dev error.

We strongly suggest following along and carefully using each of the listed methods in order to resolve the issue as quickly as possible. So without further delay, let’s get discuss each of the listed workarounds of the guide.

Verify The Game Files

First things first, it is essential that you verify the game files of Modern Warfare 2 as, more often than not, most of the problematic errors may stem from vital files ending up missing or corrupted, which in turn can cause users to experience malfunctions and other bugs or errors while playing it.

The game’s PC version is available on both Battlenet and Steam, and both launchers conveniently provide a feature that allows it to scan the files and ensure nothing has gone missing from its place. Follow the detailed steps below to verify the files across both platforms.


steam launching
Open up steam (image credit: eXputer)
  • You will first need to open up the Steam launcher, which can be done by searching it up from your Windows search bar, or you can have it pinned on your taskbar or as a shortcut for ease of access.
  • Once you have, it opened, navigate to the Library section and scroll through the list of games and locate the COD Modern Warfare title.
  • Right-click on it from the list of games to open up a small sub-menu where you need to click on the Properties setting.
steam verify files
How to verify the integrity of game files (image credit: eXputer)
  • You will now be displayed in the Properties menu of the game on Steam.
  • Here, hop into the Local Files section, as shown in the image above.
  • You should now be able to see the Verify Integrity Of Game Files option, which will begin the process of checking your game directory for any loose ends.
  • Click on the prompt to begin the process, which should take around 10 to 15 minutes to complete as it mostly depends on the game’s size.
  • Once done, head back into the game and evaluate if it helped you cure the dev error so we can move on to the next couple of fixes.


In the chance that you bought Modern Warfare 2 on the Battlenet launcher, then do not worry, as we have covered a few short steps to help you verify the game files he

Overwatch 2 crashing
How to open up Battlenet
  • Open up the Battlenet launcher by searching for it in the search bar or have it pinner under your taskbar, as previously mentioned with Steam.
  • Once here, from the list of games at the top of the page, select Call Of Duty Modern Warfare 2 from the list.
Modern warfare 2 dev error 356
Modern Warfare 2 in Battlenet (image credit: eXputer)
  • Click on the Gear icon located to the side of the Play button, as shown in the image above.
  • Now simply select the Scan and Repair option, which allows the launcher to evaluate the game directory for any kind of misconceptions and restores the files if there are any ones that are missing.
  • It will ask for a confirmation, after which it should begin the process, which, again, will take somewhere around 10 to 15 minutes due to the size of the game.
  • Make sure to launch the game again to check if the error persists or not.


According to a few users on the community forums of the game, the game has a tendency to produce these dev errors due to an unstable connection to the servers so they resorted to using a VPN connection. If you’re out of the loop here, a Virtual Private Network can help reduce network instability when you’re trying to establish a connection with the servers or if the accessway is trying to restrict your game connection.

So, in order to counteract this problem, users can apply a VPN to their connection whilst playing the game which will help you mask your connection and form a firm connection with the Modern Warfare 2 servers. Some great free VPN options include ProtonVPN, but if you’re looking for some premium plans, we highly suggest looking at services like NordVPN, which are known to provide excellent quality and connections.

You can practically choose any region that you want once you launch the VPN, but just try to make sure that you play through a match or two in order to check if it fixed the issue of the dev error 356.

Enable Shader Cache Optimization

Shader cache MW2
Shader optimization (image credit: eXputer)

One of the few workarounds that players have discovered whilst playing the game comes down to enabling the Shader cache setting, which will allow the game to render the textures and assets again when you load it up in-game. It will allow the game to essentially refresh any of its old components and replace them with newer ones, reinvigorating most of the gameplay.

dev error 356 mw2
The shader cache setting in MW2 (image credit: eXputer)

The setting itself can be found in the game’s Graphics settings under the Display tab, as shown in the image above. If you’re also experiencing performance issues, then it’d be wise to try the feature out and see if it helps your sort the problems in a pinch. Once you play a match or the campaign for the first time after choosing the option, it will take some time for the effect to take place, so be sure to give it some time to render everything.

The Wrap-Up

Call Of Duty Modern Warfare 2 may have had one of the liveliest launches in the entire franchise, but tedious issues such as the Hueneme Error Code and the Multiplayer Installing Error are just the tip of the iceberg when it comes to the Crashes of COD Modern Warfare 2. When it comes down to it, even self-explanatory workarounds such as restarting the PC or updating the GPU drivers fail to make any sort of dent in this tedious dev error.

Despite going through each fix, if you are still facing constant issues, then the last course of action may be to submit a complaint ticket or receive aid from the Official Activision Customer Support Site, which will detail everything you need to know about the game and any known problems within it. Aside from that, the only ray of hope may only be that the developers respond to these bugs as soon as possible and implement a patch.

This wraps up our guide on how to fix Dev error 356 in COD Modern Warfare 2. Be sure to let us know your experience with the game and if you managed to fix it yourself in any way in the comments section below. As always, eXputer wishes you luck!

Next: Grounded Multiplayer Not Working

Was this article helpful?

Thanks! Do share your feedback with us. ⚡

How could we improve this post? Please Help us. ✍

Haider Khan

PC gaming geek with three years of content writing experience - covering Video Game Settings, and errors across all devices.

Related Articles