Found some of the GM Info on it. Good stuff to check
Fault code P0411, Secondary Air Injection System Fault
Listed possible causes

Circuit relay or fuse open
Where do I find circuit relay and fuse?
I have two fuse panels 1) beside engine belt and 2)behind kick panel at passenger front, neither said air pump.

Check connector and wiring
Where are wiring connectors I need to be checking?

Air pump defective or hoses blocked