Unless you were lucky, I expected that would happen after I saw your above posts. REMEMBER, THE STEERING WHEEL NEEDS TO STAY STRAIGHT DURING REPAIR! In your case you had the swps floating around on test drive. Try to get it back to the ORIGINAL position? Start fresh and REPLACE? or CALIBRATE current position:
The SWPS must be calibrated any time you move the steering wheel while working on the steering steering system. Once calibrated, the EBCM interprets the relationship between the Phase A and Phase B inputs, and determines the exact position of the steering wheel and the direction of the steering wheel rotation. If the signals don’t match to what the EBCM expects, it’ll conduct additional tests and set a trouble code for the SWPS.

 

I believe it's back to the original position. The steering wheel was locked when we did the repair, but it came out of the shaft when I tried to reset it onto the intermediate shaft pin (where the bolt goes thru the aluminum pin down near the floor) Do I need to take it to a GM shop to have it recalibrated? Is it safe to drive it?

 

Back to the original position? Scan and post the code.

 

I had the same problem. Some sensors can be recalibrated but if yours is like mine it can't be. You'll have to get a new one. An original AC Delco one is around $100. Most of the after market ones work for a few months but seem to fail quickly. The new one will have a metal pin in it to keep it centered. You'll want to slide the new one on till it's flush at the top and then remove the pin but not before. If you remove the pin before you put it on you'll end up with a $100 going down the toilet. If you ever do anything with your steering column again center the wheel first and then put that pin back in. You can drive with that light on but your stabilitrak system won't work.