I have a tool (DashHawk) that can clear the codes. I think places like AutoZone can do that too. It is my understanding that these codes can't be reset by a simple tool and it requires one of the GM tech tools. The reason being: apparently if you pull that MSD with the 12v computer still "alive", it thinks the car has been in an accident.would think I can buy a scanner that would do it also. Right to repair and all.