I have a fine old Camaro Z28. About three weeks ago I replaced the secondary AIR injection pump, which was dead. It worked fine until yesterday. I got a P0412 code, and the pump did not run. The 30 amp air pump fuse was blown. I replaced it, and the new fuse blue right away. Same code.

What do I do to figure this out?

Thanks for listening.

(No, blew.)

Right after I posted, I found the page about P0412. Very informative.

https://www.gmforum.com/obd-ii-troub.../p0412-285585/

Sounds like the replacement AIR pump is defective.