How to Fix “LowLevelFatalError” Crashes in Hell Let Loose?

Hell Let Loose, as a demanding Unreal Engine 4 title, can sometimes trigger a LowLevelFatalError, resulting in sudden freezes or crashes accompanied by a UE4 crash report. This error often occurs when the game engine encounters an unrecoverable issue while processing GPU-intensive tasks. In many cases, a sudden spike in GPU usage precedes the crash, suggesting either:

• A memory allocation failure (where the engine fails to properly manage VRAM or system RAM under heavy load),
• A graphics API conflict (such as DirectX 12 instability or driver-level rendering errors),
• An unhandled engine exception (where UE4 encounters corrupted data or an unsupported operation).

The crash can occur at any point—during loading screens, server connections, or even mid-gameplay. Below are the most common root causes:

• Overclocked Memory (XMP Enabled): While memory overclocking (XMP/DOCP) boosts system performance, some games—including Hell Let Loose—may not handle it efficiently. This can lead to memory allocation instability, especially if the RAM isn’t fully stable at its rated speed.
• Outdated or Incompatible Graphics Drivers: Unreal Engine 4 relies heavily on GPU drivers for rendering and stability. Older drivers may lack optimizations for the game’s latest updates, causing crashes.
• Corrupted or Missing Game Files: Improper shutdowns, interrupted updates, or unstable internet connections can corrupt game files. UE4’s integrity checks may fail, triggering the error.

Now that we’ve identified the key causes, let’s proceed with solutions to fix the LowLevelFatalError in Hell Let Loose.

1. Verify Integrity of Game Files

Steam’s “Verify Integrity of Game Files” feature checks your game files to ensure they match the original versions on Steam’s servers. If it finds any missing, damaged, or incorrectly modified files, it automatically replaces them with fresh copies. This fixes common issues like crashes or glitches without affecting your save data or settings and usually takes only a few minutes to complete.

1. Launch the Steam client on your computer.
2. Navigate to your Library tab to view all installed games.
3. Locate Hell Let Loose in your library, right-click it, and select Properties.
4. In the Properties window, select Installed Files from the left sidebar.
5. Click the Verify Integrity of Game Files button to initiate the scan.
6. Wait for Steam to complete the verification process. This may take several minutes depending on your system and game size.
7. Once completed, restart Steam and launch Hell Let Loose to check if the issue persists.

2. Disable XMP Profile from BIOS

Disabling XMP (Extreme Memory Profile) in your BIOS settings can help resolve stability issues. This will reset your RAM to run at its default, stable speed instead of the overclocked XMP speed. While this may slightly reduce performance in some applications, it often resolves crashes in games like Hell Let Loose that are sensitive to memory overclocking.

Note: While these steps cover the general process, your BIOS may look different depending on your motherboard brand. For exact instructions, check your motherboard manual or the manufacturer’s support website.

1. Restart your computer and repeatedly press the BIOS key (typically Delete, F2, or F12 depending on your motherboard) during startup to enter BIOS.
2. Navigate to the M.I.T tab (Motherboard Intelligent Tweaker) using your keyboard arrows.
3. Select Advanced CPU Settings to access memory-related configurations.
4. Locate and select Extreme Memory Profile (X.M.P) – this is an automatic memory overclocking feature.
5. Change the X.M.P profile from Enabled to Disabled, then save changes (usually F10).
6. Exit BIOS (changes will save automatically), let your system reboot normally, then launch Hell Let Loose to verify the fix.

3. Update Graphics Drivers

GPU manufacturers regularly release driver updates that include performance optimizations and bug fixes specifically for new game releases. Keeping your drivers updated helps prevent crashes and can make games run smoother with better graphics.

3.1 For Nvidia Users

1. Open your browser and go to the official NVIDIA app download page.
2. Download and install the NVIDIA app (first search result).
3. Launch the app and click Drivers in the left sidebar.
4. Click Download or Update to install the latest drivers.

3.2 For AMD Users

1. Visit the official AMD Adrenalin software page.
2. Download and install the AMD Adrenalin Edition app.
3. Open the app and go to the Driver & Software section (top-right).
4. Click Check for Updates and install if available.

4. Launch the Game with DirectX 11

While DirectX 12 offers improved performance and additional features, it can sometimes cause stability issues with certain games, resulting in crashes or errors. Switching to DirectX 11 – while older – often provides more reliable performance as it’s better optimized for these titles.

4.1 For Steam

1. Launch the Steam client on your computer.
2. Click Library in the top menu to view your game collection.
3. Locate Hell Let Loose in your library (use the search bar if needed).
4. Right-click the game and select Properties.
5. In the General tab, find the Launch Options field.
6. Type the following command exactly:

   -dx11

   

7. Close the properties window – the game will now always launch using DirectX 11.

4.2 For Epic Games

1. Launch the Epic Games Launcher on your computer.
2. Click your profile icon (top-right corner) and select Settings.
3. Scroll down to the Manage Games section at the bottom.
4. Locate Hell Let Loose and click the drop-down arrow to expand its options.
5. Enable Additional Command Line Arguments by checking the box.
6. Enter the following command in the text field:

   -dx11

7. Return to your library and launch the game to test if the issue is resolved.

5. Underclock Your GPU

If other fixes haven’t worked, underclocking your GPU can help stabilize Hell Let Loose by reducing heat and power-related instability. This process lowers your GPU’s clock speed, decreasing performance slightly but potentially preventing crashes.

⚠️ Important Notes:

• Underclocking is not risk-free—improper settings can cause system instability.
• Only attempt this if you’re comfortable with GPU tuning tools.
• Monitor temperatures to ensure your GPU remains within safe limits.

Let’s begin:

1. Launch MSI Afterburner and click the Settings gear icon (bottom-left).
2. In Compatibility Properties, enable both:
   • Unlock voltage monitoring
   • Unlock voltage control

   Then click Apply.

3. Restart MSI Afterburner – you’ll now see voltage readings.
4. Click the Curve Editor button (next to Voltage section).
5. In the graph that appears:
   • Note your GPU’s current voltage (e.g., 1000mV)
   • Reduce voltage by 10% max (e.g., to 900mV)
6. Adjust the curve:
   • Hold Shift and drag points downward
   • Maintain a smooth curve shape

   

7. Test stability:
   • Close Curve Editor and run Kombustor (built-in benchmark)
   • Monitor for artifacts/crashes for 5-10 minutes

   

8. If stable, launch Hell Let Loose to verify the fix. If unstable, increase voltage slightly and retest.

After trying all the solutions listed, if the error still appears, consider contacting the Hell Let Loose support team for further assistance.