Need Help (03 Escalade Fuel Injection Circuit)

Hey guys.
I was wondering if you guys would be able to help me out? I bought a 03 Escalade Ext about a month ago. Love the truck but theres one problem, the check engine light came on. So I used my buddies scanner and it comes saying the Fuel Injection Circuit is open.
Would anyone have any idea’s what may cause this? Any help would be appreciated. I would rather fix it myself then take it someone and have it be something easy.

Thanks again everyone!!

http://www.grandamgt.com/forum/archive/index.php/t-22261.html

Thank you for that!
I’ll have to go home and do this over the weekend.