Modern Warfare 2 Detrick Lester error - All solutions and how to fix

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Modern Warfare 2 player inspecting gun
Credit: Activision
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The Modern Warfare 2 Detrick Lester error is a constant cause of frustration for players dropping into the action. This particular error code is one that's appeared since the beta launched and despite the best efforts of Infinity Ward, it's still causing chaos.

With the start of Season Two Reloaded on the horizon, you'll want to know a definite workaround for this particular problem so you can experience the second half of Season Two without any kind of unwanted interference. Thankfully, there are a number of solutions to stop the Detrick Lester error once and for all.


Before we take a closer look at fixing the Modern Warfare 2 Detrick Lester error code, check out our other guides showcasing the best assault rifle to use along with the best ranked play loadouts for competitive play.

Modern Warfare 2 Detrick Lester error fix

As we mentioned above, there are a few workarounds that stop the Detrick Lester error code from appearing when loading into multiplayer. The error can appear due to a number of factors that range from incorrect login information to issues with your internet connection. Here's how to fix it.

Check your internet

The first place to start is by checking to see if there are any issues with your internet connection. There are various factors that can cause interference so we recommend restarting your router. Usually, this will stop any existing problems causing the Detrick Lester error to time you out.


Verify mobile number with Steam

The Detrick Lester error often involves the inability to log into Demonware. By verifying your mobile number with Steam, there's a chance it will help.

  • Open Steam and head to your account details.
  • Click 'Manage your phone'.
  • Select 'Remove phone'
  • Reapply your number using Steam Guard.

Check the Modern Warfare 2 servers

There are some occasions when the Modern Warfare 2 servers aren't performing as they should which results in the Detrick Lester error appearing. A simple check of the server status can tell you everything there is to know. Here's how to check if there are any issues:

  • Head to the Activision Support page.
  • Scroll down and select your platform.
  • See if the servers are experiencing any issues.

There you have it, by following these handy tips, the Detrick Lester error should disappear and you can jump back into Modern Warfare 2. For more, take a look at our guides highlighting the best SMG and the latest intel on when the next double XP event takes place.