Thanks again. That points me in the right direction with such a range of tools to choose from.

As soon as kur4o said that I feared that's what the break in the chain was. Thank you. I'll update the results when I use a more reputable device.

10-4. It is a USB to OBDII.
The brand is Godiag. Model GD101.

Sorry, what do you mean by interface? I'm using PCM Hammer through the vehicle's OBD2 wiring as i dont have a bench harness yet.

I did try that as well. Here are those results.

I am brand new to working with vehicle PCM's. I have a 2005 Trailblazer EXT 4.2L that I recently replaced the motor with one from a donor vehicle. The donor vehicle was the same year and model, just the next trim package up. I used the original PCM from my TB, and it has been running great. Only a r...