(USED) ECU/ PCM FOR 2004 GM LR4/ 4.8L V-8. P/N 12589462 S/N 86YHZP9051599ZK9 MODEL: ECU/ PCM FOR VORTEC 4800/ 4.8L V-8. To find out more about this part, give us a call. We ship worldwide! Complete Recycling Group (CRG) 929 W PULASKI HWY ELKTON, MD 21921