The key in my 2010 Chevy HHR automatic will not turn back to the OFF position. It is stuck in the RUN position with the car on.
What is the cause of this problem? How can I shut off the car?
Shift out of and back into park a few times, and try to wiggle the shifter around park while you try to turn the key out. This would be the 'usual' reason the key would be stuck in.
Next, try moving the steering wheel slightly, while again trying to back out the key.
If that's not it, is there a button you need to press to release the key? If so, push it in and out a few times while trying to remove the key.
All of these should lock the key between Accessory, Run, and Start though, and none of them should stick it in the On position.
If it's really stuck running, and you can't remove the key, you have a few options:
It looks like there is an open bulletin on the 2010 Chevy HHR. The sensor that reports whether or not the vehicle is in park (inside the gear shift) can easily break.
Took it into the chevy dealership, they fixed it for free.