How to Fix Error Code HILLCAT in Call of Duty: Black Ops 6 & Warzone

If you’re a Call of Duty player, few things are more frustrating than being hit with Error Code HILLCAT just as you’re ready to jump into a match. This network-related error, commonly seen in titles like Modern Warfare II, Warzone, and Black Ops 6, often appears when the game fails to connect to servers or download updates, leaving you stuck on the “Checking for Update” screen. In 2025, with Black Ops 6 and Warzone dominating the Call of Duty scene, this error continues to plague players across PC, Xbox, and PlayStation.

What Is Error Code HILLCAT?

Error Code HILLCAT is a network-related error in Call of Duty games, primarily affecting Modern Warfare II, Warzone, and Black Ops 6. It typically occurs when the game client fails to connect to Activision’s servers or download necessary updates, resulting in messages like “Checking for Update” or “Cannot connect to matchmaking server.” The error is most common on PC but also appears on Xbox and PlayStation consoles.

The HILLCAT error disrupts gameplay by preventing players from logging in or joining matches. It’s often accompanied by a forced game exit, making it a major annoyance for players eager to grind ranks or enjoy multiplayer modes.

Why Does Error Code HILLCAT Happen?

The HILLCAT error stems from connectivity issues between your device and Call of Duty’s servers. Common causes include:

• Server-Side Issues: Activision’s servers may be down for maintenance or overwhelmed by traffic, especially after major updates like those for Black Ops 6 in June 2025.
• DNS Problems: Your Internet Service Provider’s (ISP) DNS servers may fail to resolve connections to game servers.
• Corrupted Game Files: Damaged or missing game files can prevent updates from downloading properly.
• Network Instability: Slow, unstable, or restricted internet connections (e.g., due to firewalls or safe browsing settings) can trigger the error.
• ISP Restrictions: Some ISPs block or filter connections to specific servers, causing connectivity issues.
• Outdated Game or System: An outdated game version, drivers, or system software can lead to compatibility problems.

Player reports on X highlight the frustration, with many encountering HILLCAT after updates in June 2025, particularly for Black Ops 6.

Step-by-Step Guide to Fix Error Code HILLCAT

Below are proven solutions to resolve Error Code HILLCAT on PC, Xbox, and PlayStation. Try them in order, as they range from simple checks to more involved fixes.

Step 1: Check Call of Duty Server Status

Since HILLCAT is often a server-side issue, start by checking if Activision’s servers are online:

• Visit Activision’s Support Page: Go to Activision’s Online Services page to check server status for Black Ops 6, Warzone, or Modern Warfare. If servers are down, wait for them to come back online.
• Use DownDetector: Check DownDetector for real-time reports of server outages. A spike in complaints suggests a server issue.
• Follow Official X Accounts: Monitor @CallofDuty, @CODUpdates, or @ATVIAssist for outage announcements. For example, Activision acknowledged HILLCAT issues in April 2023 and June 2025.

If Servers Are Down: Wait for Activision to resolve the issue. Check back in a few hours.

If Servers Are Up: Proceed to the next steps.

Step 2: Test and Reset Your Internet Connection

A stable internet connection is crucial for Call of Duty. Here’s how to troubleshoot your network:

• Run a Speed Test: Use a site like Speedtest.net to check your download, upload, and ping. A ping above 100ms or speeds below 10Mbps may cause issues.
• Restart Your Router: Unplug your router for 30 seconds, then ¬plug it back in, and wait a minute. This clears the cache and can fix connectivity issues.
• Switch to Wired Connection: If using Wi-Fi, connect your device to the router via an Ethernet cable for a more stable connection.
• Check Network Settings: Ensure safe browsing or parental controls are disabled, as they may block game servers.
• Use Mobile Hotspot (Console/PC): Temporarily switch to mobile data to bypass ISP restrictions. Players report success with this method on Xbox and PC Twain PC.

Pro Tip: For consoles, go to Settings > Network Settings > Test Internet Connection to verify connectivity.

Step 3: Change DNS Settings

Your ISP’s DNS servers may be causing connectivity issues. Switching to a public DNS can help:

• Google DNS: Preferred DNS: 8.8.8.8, Alternate DNS: 8.8.4.4
• Cloudflare DNS: Preferred DNS: 1.1.1.1, Alternate DNS: 1.0.0.1
• How to Change DNS:
  • PC: Go to Control Panel > Network and Sharing Center > Change adapter settings > Right-click your connection > Properties > IPv4 Settings > Use the following DNS server addresses.
  • Xbox: Settings > Network > Network Settings > Advanced Settings > DNS Settings > Manual.
  • PlayStation: Settings > Network > Set Up Internet Connection > Custom > Manual DNS.
• Test the Game: Launch Call of Duty to check if the error persists.

Step 4: Verify Game File Integrity

Corrupted game files can cause HILLCAT errors. Verify and repair files via your game client:

• Steam:
  1. Open Steam Library, right-click Call of Duty: Black Ops 6 or Warzone.
  2. Select Properties > Local Files > Verify integrity of game files.
  3. Wait for the process to complete, then restart your PC.
• Battle.net:
  1. Click the gear icon next to the game.
  2. Select Scan and Repair.
  3. Wait for the process to complete, then restart the game.
• Console:
  • Xbox: My Games & Apps > Manage > Updates > Update All.
  • PlayStation: Re-download the game if necessary, as consoles don’t have a direct file verification option.

Step 5: Use a VPN Temporarily

Some players report that a VPN resolves HILLCAT by bypassing ISP restrictions:

• Download a Free VPN: Try ProtonVPN or UrbanVPN (free tiers available).
• Switch Server Location: If in the US, connect to a UK or EU server; if in the UK/EU, connect to a US server.
• Steps:
  1. Connect to the VPN and start the game.
  2. Once the update completes, disconnect the VPN and relaunch the game.
• Note: Turn off the VPN after the update to avoid lag during gameplay.

Step 6: Clear Game Cache or Folder

Corrupted cache files can interfere with updates:

• PC:
  1. Navigate to C:\ProgramData\Activision or C:\Users\[YourUsername]\AppData\Local\Activision.
  2. Delete the Call of Duty folder (this won’t affect saved data).
  3. Relaunch the game to regenerate the folder.
• Xbox:
  1. Unplug the console for 5-6 minutes to clear the cache.
  2. Plug it back in and restart the game.
• PlayStation:
  1. Go to Settings > Storage > System Storage > Clear Cache.
  2. Restart the game.

Step 7: Update Your System and Game

Ensure your system and game are up to date:

• PC:
  • Update Windows: Settings > Windows Update > Check for updates.
  • Update graphics drivers via NVIDIA/AMD software or Device Manager.
  • Check for game updates in Steam or Battle.net.
• Xbox:
  • Go to Settings > System > Updates > Update Console.
  • Check for game updates in My Games & Apps > Updates.
• PlayStation:
  • Go to Settings > System Software > System Software Update.
  • Check for game updates in the game’s Options menu.

Step 8: Reinstall the Game (Last Resort)

If all else fails, reinstall the game to eliminate corrupted files:

• PC:
  1. Uninstall via Steam or Battle.net.
  2. Delete residual files in C:\Program Files or C:\ProgramData\Activision.
  3. Reinstall the game (note: Black Ops 6 is ~80GB).
• Console:
  1. Uninstall via My Games & Apps (Xbox) or Library (PlayStation).
  2. Re-download from the store.
• Tip: Install on an SSD for faster load times.

Step 9: Contact Activision Support

If the error persists, submit a support ticket:

• Visit Activision Support.
• Select your game and platform, then choose “Gameplay” > “Crashes” > Create a Support Ticket.
• Provide details about the HILLCAT error and steps you’ve tried.

Platform-Specific Fixes

PC-Specific Fixes

• Check Event Viewer: Go to C:\Windows\Minidump, use WinDbg (from Microsoft Store) to analyze crash logs, and look for the Failure Bucket ID.
• Update BIOS: Check your motherboard manufacturer’s website for BIOS updates. Use a FAT32-formatted USB to apply updates.
• Check System Requirements: Ensure your PC meets Black Ops 6’s requirements via PCGameBenchmark.

Xbox-Specific Fixes

• Clear Cache: Unplug the console for 5-6 minutes.
• Check Xbox Live Status: Visit the Xbox Live Status page.

PlayStation-Specific Fixes

• Test Internet Connection: Settings > Network > Test Internet Connection.
• Rebuild Database: Boot in Safe Mode (turn off PS, hold power button until second beep), select Rebuild Database. This won’t delete data but may fix corrupted system files.

Preventing Error Code HILLCAT

To avoid HILLCAT errors in the future:

• Maintain a Stable Connection: Use Ethernet over Wi-Fi and ensure speeds of at least 10Mbps with low ping.
• Use Reliable DNS: Stick to Google or Cloudflare DNS for consistent connectivity.
• Keep Software Updated: Regularly update your game, drivers, and system software.
• Monitor Server Status: Check Activision’s server status before playing, especially after updates.
• Clear Cache Regularly: Clear game and console cache monthly to prevent corruption.

Tools to Help Fix HILLCAT Errors

Here are tools to streamline troubleshooting:

• Speedtest.net: Test internet speed and ping (free).
• ProtonVPN: Free VPN for bypassing ISP restrictions.
• WinDbg: Analyze PC crash logs (free via Microsoft Store).
• DownDetector: Monitor Call of Duty server status (free).
• Activision Support: Submit tickets for personalized help (free).

Troubleshooting Tools Comparison

Tool	Purpose	Cost
Speedtest.net	Test internet speed	Free
ProtonVPN	Bypass ISP restrictions	Free/Paid
WinDbg	Analyze crash logs	Free
DownDetector	Check server status	Free
Activision Support	Get official support	Free

FAQs About Error Code HILLCAT

What causes Error Code HILLCAT in Call of Duty?

It’s typically caused by server outages, DNS issues, corrupted game files, or unstable internet connections.

Does HILLCAT affect all Call of Duty games?

It’s most reported in Modern Warfare II, Warzone, and Black Ops 6, but can occur in other titles.

Can a VPN fix HILLCAT errors?

Yes, temporarily using a VPN to bypass ISP restrictions can help the game update.

Will reinstalling delete my progress?

No, progress is tied to your Activision account, not local files.

How do I know if it’s a server issue?

Check Activision’s server status page or DownDetector for outage reports.

Conclusion: Get Back to Gaming in 2025

Error Code HILLCAT can be a frustrating roadblock, but it’s fixable with the right steps. Start by checking server status, then troubleshoot your internet, DNS, and game files. For persistent issues, a VPN or reinstall may be necessary. In 2025, with Black Ops 6 and Warzone updates rolling out, staying proactive with system maintenance can keep HILLCAT at bay.

Ready to fix Call of Duty error HILLCAT? Try these solutions and jump back into the action. If you’re still stuck, share your experience in the comments below, and let’s troubleshoot together!

Resource: For more troubleshooting tips, visit Activision Support.