How To Fix COD Modern Warfare Dev Error 6456 | NEW in 2025!
Some Modern Warfare players may encounter Dev Error 6456. If you are getting this error for no apparent reason, this troubleshooting guide might help.
In this post, we’ll show you the potential solutions that we’ve collected over time since error 6456 was first widely reported. We also provide a brief discussion of the possible reasons why this error may be happening.
What are the reasons for Modern Warfare Dev Error 6456?
We’ve compiled a number of possible reasons why you may be getting Modern Warfare Dev Error 6456. Check out each of these factors below.
Random game bug.
Modern Warfare Dev Error 6456 can sometimes be triggered randomly. If there’s no clear pattern when the error happens and the problem only happens once, your PC may have simply encountered a snag.
However, if the problem occurs persistently and there’s a pattern that leads to it, continue your troubleshooting by following the solutions in this guide.
Outdated Graphics card drivers.
Dev errors are usually related to GPU drivers so the best thing that anyone can do to prevent an error is to ensure that the latest drivers are installed. If you are not sure whether or not your PC runs updated drivers, you can always manually check for them.
DirectX version incompatibility.
Modern Warfare error 6456 implies that there is an issue with DirectX on your machine.
At its most basic level, DirectX acts as an interface for a Windows machine to allow it to play games, and other forms of media. Simply put, a PC needs to install DirectX so it can function as a gaming platform. If your computer has an issue with DirectX for some reason, this can translate into errors like Dev Error 6456.
Third party software interference.
Other players have reported to us that they were able to fix Error 6456 on Modern Warfare after disabling third party programs or their overlay. Some of the mentioned programs include Discord and NZXT Cam.
To know if you have a problem with a third party program, try deleting the suspected software and play the game for some time. If there’s no Error 6456 on Modern Warfare after doing so, then that particular program may be at fault.
Other unknown software issues.
Game errors may sometimes occur due to an issue with an outdated Windows OS. Make sure that you are running the latest Windows version as part of your troubleshooting.
How to fix Modern Warfare Dev Error 6456
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