How to fix Diablo 3 Error Code 300016?

Alton Alexander
By Alton AlexanderUpdated on June 4th, 2022

The error code 300016 is a Diablo 3 error code that is caused by a server issue. This error code can be caused by a number of things, but most commonly it is caused by the game servers being down or experiencing high levels of traffic.

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1. Check for updates and install the latest patch

  1. Open the Blizzard Battle.net app.
  2. Click on the Diablo III icon.
  3. Click on the "Check for Updates" button.
  4. Click on the "Install Patch" button.
  5. Wait for the installation to finish.
  6. Click on the "Play" button to start the game.

2. Run the game in compatibility mode

  1. Launch the game in compatibility mode.
  2. If Diablo III crashes during the game, try reinstalling the game.
  3. If Diablo III runs slowly or erratically in compatibility mode, try adjusting the game's graphics settings.
  4. If the game still crashes or runs slowly in compatibility mode, try upgrading your graphics card.

3. Verify the game files

  1. Go to the Diablo III folder on your computer
  2. Right-click on the Diablo III.exe file and select Properties
  3. Select the "Compatibility" tab
  4. Click on the "Verify" button
  5. Click on the "MPQ file" button
  6. Click on the "Data" button
  7. Click on the "Cache" button
  8. Check the "All files" box and click on the "Verify" button
  9. Check the "File Size" box and click on the "Verify" button
  10. Click on the "OK" button

4. Delete the Diablo 3 folder in the Documents folder

  1. Click on the Windows Start button and type in "cmd" into the search bar. When the Command Prompt window opens, type in the following command: del C:\Diablo3
  2. If you are prompted to confirm the deletion, type in "yes" and hit enter.
  3. Once the Diablo 3 folder has been successfully deleted, close the Command Prompt window.

Some users might also have success with the following opitons:

  1. Delete the Battle.net folder.
  2. Reinstall the game.
  3. Run the game as an administrator.
  4. Temporarily disable antivirus and firewall software.
  5. Reset the game settings.
  6. Contact Blizzard customer support.