Got a new code scanner to address my blown #28 Fuse. After replacing the fuse my Envoy runs again but I don't trust it because it just blows the fuse randomly. I thought I figured it out a few years ago by replacing all the coils and it ran fine until 4 days ago. So, my new code scanner doesn't see the PCM. I tested the new scanner on my other car and it works no problem. Would this indicate a bad PCM? Thanks for any input. c good