ERROR_RUNLEVEL_SWITCH_AGENT_TIMEOUT - 15403 (0x3C2B)
A run level switch agent did not respond within the specified timeout.
Updated: Feb 21, 2026
Technical Meaning
The error code ERROR_RUNLEVEL_SWITCH_AGENT_TIMEOUT (15403, 0x3C2B) indicates that a run level switch agent failed to respond within the specified timeout period. This error is typically encountered during system transitions between different run levels, such as booting or shutting down.
Error Details
Run level switching in Windows involves transitioning the operating system from one state (e.g., user mode) to another (e.g., kernel mode). Agents are responsible for performing specific tasks during these transitions. If an agent does not respond within the allocated time, this error is generated.
Usage Context
This error can occur in various scenarios where run level switching is initiated by the system or a user. Common contexts include:
- System boot process
- System shutdown
- User logon/logoff events
- Changes in system power states (e.g., sleep to hibernation)
Developer Interpretation
Developers should interpret this error as an indication that a critical agent failed to complete its task within the expected timeframe. This could be due to various reasons, such as incorrect parameter values, corrupted data, or unsupported operations.
Related Errors
ERROR_RUNLEVEL_SWITCH_FAILED(15402, 0x3C2A): A generic run level switch failure without specifying a timeout issue.ERROR_SERVICE_REQUEST_TIMEOUT(10067, 0x278B): Indicates that a service request timed out, which could be related to the agent failing to respond in time.
FAQ
Q: What does this error mean?
A: This error indicates that an agent responsible for run level switching did not respond within the specified timeout period.
Q: How can I troubleshoot this issue?
A: Review the operation context, validate parameters, and ensure correct object types are being used. Check input data integrity and verify system limits or constraints.
Summary
The ERROR_RUNLEVEL_SWITCH_AGENT_TIMEOUT (15403) error is a specific technical indication that an agent involved in run level switching did not respond within the expected timeframe. Developers should focus on validating parameters, ensuring correct object types, and verifying input data integrity when encountering this error.