When turning off my Torrent the key locks before it has fully turned off. It has done it three times in the same day and I was wondering if it was my starter or something else. The key gets stuck in the middle position, the one which doesn't turn the engine on but continues to run the lights and radio. The only way to remedy it is by fully turning the car back on and attempting to turn it off again. It sometimes takes me repeating those steps more than once.
Starter Problem? on 2007 Pontiac Torrent
This is most likely a problem with your Ignition Lock Cylinder. They can go out and I have had to replace few on modern GM vehicles. Does it help if you try to turn the wheel? here are some shops if you need help: