ERROR_MCA_OCCURED - 651 (0x28B)
A Machine Check Error has occurred. Please check the system eventlog for additional information.
Updated: Feb 21, 2026
Technical Meaning
The ERROR_MCA_OCCURED error code, with the numeric value of 651 and the hexadecimal representation of 0x28B, indicates that a Machine Check Error has occurred. This type of error is related to hardware issues within the system, specifically errors detected by the processor or memory.
Error Details
A Machine Check Error (MCE) is an internal hardware error reported by the CPU when it detects a critical issue such as a parity check failure, cache error, or other hardware-related anomalies. These errors are logged in the system event log and can provide valuable information for diagnosing hardware failures.
Usage Context
This error code is typically encountered during system operation when the operating system detects an internal hardware error that cannot be handled by normal software mechanisms. It is not a user-facing error but rather an indication to administrators or developers that there may be underlying hardware issues that need attention.
Developer Interpretation
As a developer, encountering this error code should prompt a thorough investigation of potential hardware failures. The event log will provide additional details about the nature and location of the error, which can help in identifying the specific component causing the issue (e.g., CPU, memory module).
Related Errors
ERROR_CORRECTED_MEMORY_ERROR- Indicates that a corrected memory error occurred.ERROR_UNEXPECTED_INQUIRY_COMMAND- Occurs when an unexpected inquiry command is received by a device driver.ERROR_DISK_RECALIBRATE_FAILED- Indicates that the disk recalibration failed, which might be related to hardware issues but not directly linked to MCEs.
FAQ
Q: What does ERROR_MCA_OCCURED mean?
A: It indicates an internal hardware error detected by the CPU or memory. This is logged in the system event log for further analysis.
Q: How can I troubleshoot this issue?
A: Review the system event logs for detailed information about the MCE, and check the status of all hardware components, particularly the CPU and memory modules.
Summary
The ERROR_MCA_OCCURED error code is a specific indication of an internal hardware error detected by the processor or memory. It requires investigation into potential hardware failures to ensure system stability and reliability.