0x00000159 is a memory-related stop code result. This indicates that the IOMMU has delivered a page fault against an ASID that was in the process of being freed. The driver was responsible for completing any inflight requests before this point in time and this bugcheck indicates a driver in the system did not do so.
Code reference and safe checks
Read the exact screen and operation before selecting a repair. This page does not run commands or collect files, keys or logs.
What this value means
This indicates that the IOMMU has delivered a page fault against an ASID that was in the process of being freed. The driver was responsible for completing any inflight requests before this point in time and this bugcheck indicates a driver in the system did not do so.
HAL_ILLEGAL_IOMMU_PAGE_FAULT identifies a stop-code family. The four bug-check parameters and dump, if available, help distinguish the actual failure path.
| Code | 0x00000159 |
|---|---|
| Short hex form | 0x159 |
| Symbol | HAL_ILLEGAL_IOMMU_PAGE_FAULT |
| Windows family | Blue screen and stop codes |
| Source level | Microsoft bug-check page |
Safe next steps
- For 0x00000159 (HAL_ILLEGAL_IOMMU_PAGE_FAULT), record the stop code, parameters, recent drivers, and whether Windows remains stable in Safe Mode.
- Use an official memory diagnostic only as evidence; this code alone does not prove that a RAM module is bad.
- Back up files before extended tests or system changes, especially if startup or storage is unstable.
After one step, repeat the original operation and record whether this same code returns. A different code needs a fresh interpretation.
What this code cannot prove
The source establishes the identifier and reference meaning. It does not establish the cause on your specific PC.
If Windows no longer starts or the issue repeats with hardware warnings, protect files and use manufacturer or qualified support.
Official reference and verification
Source type: Microsoft bug-check page. Checked against the source set on Nov 2, 2026.
The reference gives the meaning of this identifier. It does not inspect your PC or guarantee that one repair will work.