Hardware⏱️ 3 min read📅 2026-06-15

How to Fix 0x124 Error – Starting my kernel driver (StartService) results in 0x124 bluescreen due to a machine check exception due to L2 cache bank 6 error on processor 0

Windows kernel driver issue with machine check exception due to L2 cache bank 6 error on processor 0

Quick Answer: Check for overheating or faulty hardware, and ensure proper cooling and power supply. Consider updating BIOS or using a different processor.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. 🚀 How to Resolve This Issue
  3. ✨ Wrapping Up

The error 'WHEA_UNCORRECTABLE_ERROR (124)' occurs when the kernel driver fails to start properly, resulting in a bluescreen with a machine check exception due to L2 cache bank 6 error on processor 0. This issue affects users who are running Windows 7 and have installed a kernel driver that is causing this problem.

This error can be frustrating because it prevents the system from loading the critical drivers needed for proper functionality, resulting in blue screens and system instability. In this guide, we will walk you through the steps to troubleshoot and fix this issue.

🛑 Root Causes of the Error

  • The primary reason for this error is a faulty or corrupted kernel driver that is causing the L2 cache bank 6 error on processor 0. This can occur due to various reasons such as incorrect installation, outdated drivers, or conflicts with other system components.
  • An alternative reason for this error could be a hardware issue with the system's processor or memory, which may be causing the machine check exception.

🚀 How to Resolve This Issue

Disable and Reinstall the Kernel Driver

  1. Step 1: Step 1: Disable the kernel driver by going to Device Manager, finding the problematic driver, and disabling it. This will prevent any further errors and allow us to troubleshoot the issue.
  2. Step 2: Step 2: Restart your system in Safe Mode and try loading the kernel driver again. If it still fails to load, proceed to the next step.
  3. Step 3: Step 3: Reinstall the kernel driver by downloading the latest version from the manufacturer's website or updating it through Windows Update.

Update BIOS and RAM

  1. Step 1: Step 1: Check if your system's BIOS is up-to-date, as outdated BIOS can cause hardware compatibility issues. You can check for updates in the BIOS manufacturer's website or through the Windows Update utility.
  2. Step 2: Step 2: Verify that your system's RAM is compatible with the processor and is properly seated. In some cases, adding more RAM or upgrading to faster RAM can resolve L2 cache bank errors.

✨ Wrapping Up

To summarize, the error 'WHEA_UNCORRECTABLE_ERROR (124)' occurs due to a faulty kernel driver or hardware issues. By disabling and reinstalling the kernel driver, updating BIOS and RAM, you should be able to troubleshoot and fix this issue. If the problem persists, it may be necessary to seek further assistance from a professional technician or the manufacturer's support team.

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