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0x0000004ABSODCritical

0x0000004A — IRQL Gt Zero at System Service | Blue Screen Fix Guide

IRQL_GT_ZERO_AT_SYSTEM_SERVICE

Windows XPWindows VistaWindows 7Windows 8Windows 10Windows 11

What Does 0x0000004A Mean?

A system service was called while the IRQL was above PASSIVE_LEVEL, which is not allowed.

Real-World Causes

  1. 1Driver calling system services at raised IRQL
  2. 2Synchronization error
  3. 3Driver IRQL management bug

Symptoms

  • ⚠Blue screen with stop code IRQL_GT_ZERO_AT_SYSTEM_SERVICE
  • ⚠System reboots unexpectedly
  • ⚠Possible data loss from unsaved work

DIY Fix

Beginner-friendly steps you can try at home

  1. 1Restart your computer
  2. 2Run System File Checker (sfc /scannow)
  3. 3Check Windows Update
  4. 4Run DISM /Online /Cleanup-Image /RestoreHealth

Advanced Fix

For experienced users and IT professionals

  1. 1Analyze minidump with WinDbg
  2. 2Check Event Viewer for correlated errors
  3. 3Use Process Monitor to trace system activity
  4. 4Perform clean boot to isolate the cause

Frequently Asked Questions

What causes IRQL_GT_ZERO_AT_SYSTEM_SERVICE?
A system service was called while the IRQL was above PASSIVE_LEVEL, which is not allowed.
Can I fix IRQL Gt Zero at System Service myself?
In many cases yes. Start with basic troubleshooting like restarting, updating drivers, and running System File Checker. If the issue persists, advanced analysis of crash dumps may be needed.

Related Error Codes

0x0000000AIRQL not Less or Equal0x000000C8IRQL Unexpected Value

About the Author

Windows Troubleshooting Team

Verified against official Microsoft documentation and real-world diagnostic data. Error behavior confirmed across Windows 10, Windows 11, and Windows Server.