99 Silverado Starts and Dies code P1631 B2960 Passlock Theft System 30min Learn No Tools

Customer states engine starts and dies after replacing steering column.
The anti theft Passlock system sensor is located in the ignition lock cylinder housing along with a magnet on the lock cylinder.
By changing these components the anti theft system no longer receives a valid learned key code signal and will not allow the engine to run.
A 10 minute learn process involving SPS programming and an internet connected PC can be used.
Alternatively a manually initiated 30 minute learn can be done as shown in this video.