Windows Stop Code DATA_BUS_ERROR (0x0000002E): Meaning, Parameters, and Troubleshooting
Quick Answer DATA_BUS_ERROR is Windows bug check 0x0000002E. Microsoft says it typically indicates a detected parity error in system memory. Its documentatio...
Quick Answer
DATA_BUS_ERROR is Windows bug check 0x0000002E. Microsoft says it typically indicates a detected parity error in system memory. Its documentation says the cause is almost always hardware-related, with possible problems including defective RAM, cache or video memory, incompatible hardware, or a configuration issue. It also lists disk corruption and a particular invalid driver memory access as possibilities. Microsoft Learn
Start by preserving the crash dump and important data. Check for recently added hardware, run the computer manufacturer’s diagnostics, and inspect the dump and System log. Do not replace RAM solely because of the stop-code name; establish which component the available evidence implicates. Microsoft Learn
What Does “Data Bus Error” Mean?
The name points to an error detected while handling data at a low level. Microsoft’s more useful description is that 0x2E typically signals a system-memory parity error. Parity checking is intended to reveal when data does not match its expected integrity information. Microsoft Learn
Although memory hardware is a strong lead, Microsoft’s cause list is broader. A storage problem, an incompatible component, or a driver trying to access an invalid mapped address may also be involved. Use the parameters, dump, diagnostics, and system history together.
DATA_BUS_ERROR Parameters
| Parameter | Microsoft’s definition | Debugging use |
|---|---|---|
| 1 / Arg1 | Virtual address that caused the fault. | Examine the address in the failing execution context. |
| 2 / Arg2 | Physical address that caused the fault. | Preserve it for hardware and debugger analysis. |
| 3 / Arg3 | Processor status register (PSR). | Interpret in the relevant processor context. |
| 4 / Arg4 | Faulting instruction register (FIR). | Helps locate the instruction associated with the fault. |
These are Microsoft’s published definitions. A raw address does not automatically identify a particular removable RAM module, disk, or device; its meaning depends on the platform and dump context. Microsoft Learn
Causes Documented by Microsoft
Faulty or incompatible hardware
Microsoft says hardware is responsible almost always in its 0x2E guidance. It names defective RAM, Level 2 cache errors, and video RAM errors among the common hardware problems. A newly added component or incompatible configuration can also contribute. Microsoft Learn
Hard disk corruption
Microsoft also lists hard disk corruption. If storage errors appear in Event Viewer or manufacturer diagnostics, investigate the affected drive and protect its data before attempting repair. A 0x2E code alone does not prove a disk has failed. Microsoft Learn
Invalid driver memory access
The reference describes a driver attempting to access a nonexistent address in the 0x8xxxxxxx range with no physical mapping as another possible cause. That address description is part of Microsoft’s documented scenario; it should not be applied blindly to every system architecture or dump. Inspect the actual faulting address and driver path. Microsoft Learn
A Practical Troubleshooting Order
1. Preserve data and crash evidence
If the system is repeatedly crashing or also reporting disk errors, back up important files while they remain accessible. Keep the crash dump rather than relying on a blue-screen photograph alone.
2. Check what changed
Did the problem begin after adding RAM, a graphics card, a storage controller, another adapter, or a driver update? Microsoft recommends removing recently added hardware as a diagnostic test when practical. If a new or updated device driver preceded the crashes, investigate that driver and the vendor’s supported rollback or replacement procedure. Microsoft Learn
3. Run manufacturer hardware diagnostics
Use the diagnostics supplied by the computer or component manufacturer. Prioritize memory and any device indicated by the dump or System log. If a test identifies a faulty component, follow the manufacturer’s repair or replacement procedure. Microsoft Learn
A clean test reduces suspicion for the tested component but does not, by itself, prove that every hardware path is healthy.
4. Check Event Viewer
Review Event Viewer → Windows Logs → System around the crash. Microsoft recommends looking for additional errors that may identify a device or driver. Compare their times with the crashes and diagnostic results. Microsoft Learn
5. Analyse the dump with WinDbg
Open the dump and run:
!analyze -vRecord the four parameters, faulting instruction, call stack, and modules. Compare multiple dumps where possible. A repeated fault in the same driver path suggests a different investigation from crashes that vary widely while hardware diagnostics also report errors.
6. Investigate disk corruption if evidence points to it
Microsoft’s 0x2E guidance recommends chkdsk /f /r on the system partition for a confirmed disk-corruption scenario. Back up important data first, verify the correct volume, and allow for a restart and a potentially lengthy scan. Use the CHKDSK version appropriate to Windows, as Microsoft cautions in its documentation. Microsoft Learn
Do not run CHKDSK as a substitute for assessing a drive that is physically failing or for investigating a clearly implicated memory component.
Guidance for IT Professionals and Developers
Correlate Arg1’s virtual address and Arg2’s physical address with the dump’s processor context. Review Arg3 and Arg4 according to the platform. Inspect the failing instruction and call stack to decide whether the crash fits a hardware error, an invalid mapping, or a different problem.
Microsoft’s page also discusses older platform-specific troubleshooting, such as BIOS settings and SCSI-controller updates. Apply those steps only if they match the affected hardware. Avoid changing firmware settings indiscriminately on a modern system because a historical reference mentions them. Microsoft Learn
Frequently Asked Questions
What does DATA_BUS_ERROR mean?
Windows reported bug check 0x0000002E, which Microsoft says typically indicates a system-memory parity error. Microsoft Learn
Is bad RAM the only possible cause?
No. Microsoft also identifies cache or video memory errors, incompatible hardware, disk corruption, configuration issues, and a specific invalid driver address access. Microsoft Learn
What do Parameters 1 and 2 represent?
Arg1 is the faulting virtual address; Arg2 is the faulting physical address. Neither value alone identifies a replaceable part. Microsoft Learn
What are PSR and FIR in Parameters 3 and 4?
Microsoft labels Arg3 the processor status register and Arg4 the faulting instruction register. Their interpretation depends on the processor and crash context. Microsoft Learn
Should I replace the memory immediately?
First inspect recent hardware changes and run manufacturer diagnostics. Replace a component when testing and other evidence identify it as faulty.
Can a device driver cause 0x2E?
Yes. Microsoft documents a case involving a driver access to an address without a physical mapping. Examine the dump’s address and stack before attributing the crash to that case. Microsoft Learn
Will CHKDSK fix a parity error?
CHKDSK addresses file-system and disk issues, not defective RAM or cache. Microsoft recommends it in the disk-corruption branch of its 0x2E guidance. Microsoft Learn
Summary
DATA_BUS_ERROR (0x0000002E) typically indicates a memory parity error, and Microsoft says hardware is the cause in nearly all cases. The four parameters provide fault addresses and processor context. Protect data, analyse the dump, run targeted hardware diagnostics, and investigate disk or driver paths when their supporting evidence appears. Microsoft Learn
Sources
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