P0410

Hi, my 2001 Bravada is flashing a P0410 code which indicates that there is something wrong with the secondary air injection system, has anyone had this code flash before? What is the most common cause, I don't want to take it to the shop and get had. Any help is appreciated. Thanks.

Here's some good info.
http://www.automotiveforums.com/vbulletin/showthread.php?t=564664
Thanks to Muddog321 for the post and Blazee for listing the problem.

Thanks for the info, great post!