Error Code 0x00001338 has been a long-running issue in Call of Duty games and still gets around in MW3, and for whatever stupid reason it's now also present in MW4. It's more of an issue with Intel CPUs, but there are surprisingly simple fixes worth trying. It seems to primarily be that Intel systems run into problems when the CPU is boosting too aggressively.

Takeaways:

  1. COD MW4 Error Code 0x00001338 is linked to certain Intel CPUs and chipsets, particularly when the processor is running at higher clock speeds.
  2. What's the best way to fix Error Code 0x00001338 in Modern Warfare 4? Do the same fixes for MW3 work too?

How to Fix 0x00001338 N Error & Crashes in MW4 on Intel

Before you jump in and start doing anything hyper aggressive, make sure that Core Isolation is disabled. This usually fixes the problem for most people. By the way, make sure you're using the latest BIOS version for your hardware as well.

  • Open Start and search for Core Isolation or Windows Security.
  • Open Windows Security, then go to Device Security > Core Isolation.
  • Find Memory Integrity and turn it off.
  • Restart your PC and try launching Modern Warfare 4.

How to Fix 0x00001338 N Error & Crashes in MW4 on Intel

If everything starts working after making this change, you can wrap this guide up here and start playing the game.

Check Your Intel CPU Speed

The solution is to slightly reduce the CPU's performance core ratio.

  • Open Task Manager and select Performance > CPU.
  • On the right, you'll see your processor model and its current clock speed.
  • Certain Intel CPUs and chipsets can run into Call of Duty crashes when the processor is operating at higher clock speeds.

Install Intel Extreme Tuning Utility

  • Download and install Intel Extreme Tuning Utility (XTU).
  • Make sure you choose the correct version for your CPU generation. XTU version 7 supports Intel 14th Gen and older processors, while newer Intel CPUs require the newer version.
  • Once installed, restart your PC. You may see an error if you try to use XTU before rebooting.
  • After restarting, open Intel XTU and find Performance Core Ratio.
  • Do not start changing random settings. For this fix, only adjust the Performance Core Ratio.

Fix 0x00001338 N Error & Crashes in MW4 on Intel Solution

Lower the Performance Core Ratio

Your default ratio will depend on your CPU. For example, a setting of 55 may be displayed on some high-end Intel processors.

  • Click the left arrow to reduce the ratio by one or two points, then select Apply.
  • Launch Modern Warfare 4 and test it.
  • If the game still crashes with 0x00001338, lower the ratio another step and test again.

The goal is to find the lowest adjustment necessary to make the game stable. You may only need to reduce the ratio slightly, although some CPUs can require a much larger reduction. For example, a 13900K may need to drop from 55 to around 49 before the game becomes stable. It's going to be a process of trial and error so don't expect to get it right the first time.

Once you find a setting that works, you can leave it there. If you increase the ratio again and the crashes immediately return, you've likely found the problem.

Reset Your Modern Warfare 4 Settings

If changing the CPU speed doesn't work, it's probably a game configuration issue.

  • Close the game completely and press Windows + E to open File Explorer.
  • Documents > Call of Duty
  • Look for a players or players beta folder. Rename it, for example, to players_old.
  • When you launch the game again, Modern Warfare 4 should create a fresh folder and rebuild your settings.
  • If you cannot find the files there, enter this into File Explorer's address bar:

%localappdata%\Activision

  • Open Call of Duty > players and look for the Modern Warfare 4 configuration files, including files associated with COD 26.

Renaming the entire folder is generally preferable to immediately deleting everything because you can restore your old settings if needed.