Infinity Ward’s Call of Duty: Modern Warfare had a bit of a rough launch, with many players reporting Modern Warfare crashing their Xbox One consoles and PCs. Players encountered other bugs, such as a daily challenges error and errors connecting to online servers. One of these bugs is the Modern Warfare Dev Error 6165, which causes the game to crash when loading into single-player or multiplayer gameplay. There appears to be a straightforward — if fairly time-consuming — fix, however, so read on to find out how to fix Dev Error 6165.
What is Call of Duty: Modern Warfare Dev Error 6165?
Not much is known about Dev Error 6165, since the error message players are receiving does not specify what caused it. Reddit users report that the error occurs during loading screens for multiplayer and/or during the opening cutscene of single-player, crashing the game entirely. While trying the methods below could solve the problem for you, your best bet may be keeping up with the Activision Support Twitter and support.activision.com to see if Activision gives any official information on the error and its possible fixes. Still, the following methods have reportedly worked for some players, so they could be worth a try.
Fix Modern Warfare Dev Error 6165
Some players reported that they were able to fix the error and errors like it by adjusting certain graphical settings, particularly related to their PC monitors. User Rodancheg said they encountered Dev Error 6165 when playing on a 2K monitor in 2K resolution, and they were able to bypass the error by switching to full HD resolution. User UltraMadBoomer said they received a different Dev Error, 6606, and were able to solve it by disabling their second monitor. These fixes suggest Dev Errors like this could be related to display settings.
It seems the most reliable fix, however, is simply to uninstall and reinstall the game. Several users in that same Reddit thread report bypassing the error by doing so, including user Shodan57, who said they also reinstalled their graphical drivers in the process. Given Modern Warfare’s large download size, this could take quite a while, but it seems to be the most consistently successful error fix.