Windows Error Codes
Searchable reference for Windows error codes — system errors, BSOD stop codes, NTSTATUS, WMI, RPC, MSI installer, AD/Kerberos, BitLocker, DNS, VPN, Hyper-V, COM/DCOM and more. Each entry includes the hex/decimal value, severity, root causes, and a step-by-step troubleshooting workflow.
How to read a Windows error code
Windows surfaces error codes through Win32, NTSTATUS, HRESULT, and many subsystem-specific spaces. Each code has a hex form (e.g. 0x80070005), a signed decimal form (-2147024891), and a symbolic name (ERROR_ACCESS_DENIED). This page lets you look up any of those forms, see what triggers the code, and follow a vetted troubleshooting workflow tuned for the originating subsystem (Windows Update, BSOD, AD/Kerberos, BitLocker, etc.).
31 codes
0x0000000ACriticalIRQL_NOT_LESS_OR_EQUAL
Kernel accessed memory at improper IRQL. Almost always a faulty driver.
0x0000001ACriticalMEMORY_MANAGEMENT
Serious memory management error. Run MemTest86 to check RAM.
0x0000001ECriticalKMODE_EXCEPTION_NOT_HANDLED
Kernel mode exception was not handled. Check minidump for offending driver.
0x00000023CriticalFAT_FILE_SYSTEM
Problem in the FAT file system. Run CHKDSK.
0x00000024CriticalNTFS_FILE_SYSTEM
Problem with the NTFS file system driver. Run CHKDSK on the affected volume.
0x0000002ECriticalDATA_BUS_ERROR
Parity error in system memory. Usually indicates faulty RAM or motherboard.
0x0000003BCriticalSYSTEM_SERVICE_EXCEPTION
A system service threw an exception. Often caused by a faulty driver. Check minidump for offending module.
0x00000044CriticalMULTIPLE_IRP_COMPLETE_REQUESTS
A driver attempted to complete an IRP more than once.
0x00000050CriticalPAGE_FAULT_IN_NONPAGED_AREA
Invalid memory referenced. Caused by faulty RAM, drivers, or system files.
0x00000051CriticalREGISTRY_ERROR
Error related to the registry. May indicate disk failure or corrupted hive.
0x0000005ACriticalCRITICAL_SERVICE_FAILED
A critical service failed to start during boot.
0x00000069CriticalIO1_INITIALIZATION_FAILED
I/O initialization failed during boot.
0x00000074CriticalBAD_SYSTEM_CONFIG_INFO
Registry or BCD store is corrupt. Run Startup Repair or restore from backup.
0x0000007ACriticalKERNEL_DATA_INPAGE_ERROR
Required page of kernel data could not be read into memory. Often a failing disk or bad RAM.
0x0000007ECriticalSYSTEM_THREAD_EXCEPTION_NOT_HANDLED
A system thread generated an exception the error handler did not catch. Usually a driver issue.
0x0000007FCriticalUNEXPECTED_KERNEL_MODE_TRAP
The CPU generated a trap the kernel did not catch. Often hardware failure or overclocking issue.
0x00000080CriticalNMI_HARDWARE_FAILURE
Non-maskable interrupt from hardware. Indicates serious hardware failure.
0x0000009FCriticalDRIVER_POWER_STATE_FAILURE
A driver is inconsistent with power state transitions. Common on laptops during sleep/wake.
0x000000BECriticalATTEMPTED_WRITE_TO_READONLY_MEMORY
A driver attempted to write to read-only memory. Driver bug.
0x000000C2CriticalBAD_POOL_CALLER
A process made an illegal memory pool request. Usually a faulty driver.
0x000000C4CriticalDRIVER_VERIFIER_DETECTED_VIOLATION
Driver Verifier caught a driver violation. Check Driver Verifier settings.
0x000000C5CriticalDRIVER_CORRUPTED_EXPOOL
A driver corrupted pool memory. Run Driver Verifier to identify the culprit.
0x000000D1CriticalDRIVER_IRQL_NOT_LESS_OR_EQUAL
A driver attempted to access pageable memory at an improper IRQL. Common driver bug.
0x000000EACriticalTHREAD_STUCK_IN_DEVICE_DRIVER
A thread in a device driver was stuck in an infinite loop. Often GPU driver related.
0x000000EFCriticalCRITICAL_PROCESS_DIED
A critical system process died. Usually wininit.exe, csrss.exe, or winlogon.exe.
0x000000F4CriticalCRITICAL_OBJECT_TERMINATION
A critical process or thread terminated unexpectedly. Often a failing disk or corrupt system files.
0x000000FECriticalBUGCODE_USB_DRIVER
USB driver error. Try unplugging USB devices or updating USB drivers.
0x00000116CriticalVIDEO_TDR_FAILURE
Video TDR failure — GPU driver stopped responding and failed to recover. Update GPU drivers.
0x0000013ACriticalKERNEL_MODE_HEAP_CORRUPTION
Kernel mode heap corruption detected. Usually a driver bug.
0x00000154CriticalUNEXPECTED_STORE_EXCEPTION
An unexpected exception occurred in the store stack. Can be caused by failing storage.
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