sct tuner won't read car

[SVT Jesse]

So I installed some upgrades to my car over the week, and went to load the custom tune and now my SCT tuner won't read my car. Any idea why? I've used the tuner before on this car and worked fine

 

[96gt02]

So when you say it wont read the car, what exactly is it doing? Error code? not powering on? not unlocking ECM?