Nav2 Error Codes and Failure Analysis

Source: ros2-copilot-skills Nav2 error code skill

Why This Matters

Many navigation failures look the same from the outside: the robot stopped or gave up. Error codes are one of the fastest ways to separate TF problems, costmap occupancy issues, no-path situations, controller dead-ends, and recovery collisions.

Distilled Takeaways

• Planner, controller, and behavior servers each report different failure classes.
• Error codes are most useful when paired with costmap, TF, and RViz inspection.
• NO_VALID_PATH, NO_VALID_CONTROL, and TF_ERROR imply very different next debugging steps.
• Recovery strategy design should be informed by which error class happened, not just by the fact that something failed.
• Logs are useful, but code and BT logic can also use error information explicitly.

Practical Guidance

• Map common error codes to standard response playbooks for your robot.
• Check TF first for transform-related errors, costmaps for occupancy errors, and controller state for local-control errors.
• Use error interpretation to reduce blind parameter tweaking.
• Treat repeated specific errors as architectural signals, not just temporary noise.

Corroborating References

• Nav2 troubleshooting and configuration docs
• Nav2 behavior trees documentation

When to Read the Original Source

Go to the original skill when you want the server-by-server code tables, BT error-code propagation explanation, and recommended error-to-recovery mappings.