2007 trailblazer, avital 5305L, db3

i am having trouble with my install in my 2007 trailblazer, triple checked all wiring and looks correct and the locks and security work great but remote start will engage and try start it but dies immediately, code 9, in garage mode,i take it out of garage mode and try again,goes right back to code 9 in garage mode again, any ideas??? im at a hugew loss, do not have a bitwriter, ive installed a ton of astrostarts but that was 10+ years agoand now i feel ;like a rookie with this module!!!! avital 5305l with db3 immobilizer that was sent to me preprogrammed for 2007 trailblazer