Yea it did alittle, I know for code check they can only do odb2 or higher or something... This has the old style black housing thats rectangular with the little female pins inside... I tried it like the older gm cars test but it didnt do anything, and that either means ECM is gone, or they test differently I am not sure which... the only other thing I can think of is something came unplugged at the tranny or behind the cluster...