I just sent you a pm about the Tech II at the Chevrolet Dealership that will be able to read the code for you. Do you have a dealership close that you trust to read it for you? They will probably get such a kick about the supercharger you will make friends right off with them. I had mine at the dealership here and they love the Supercharged SSR, I even offered the Service manager a ride.
Send them an e-mail to see if their software can read the new computers for the LS2. It is pretty expensive for just a diagnostic tool. At $499.00 you can purchase HP Tuners that is both Diagnostic and Tune capable. HP Tuner is just waiting on the cables right now (I e-mail them every week). You can probably get the code read for nothing at the dealership if you take them for a ride.