You and rob the elder are correct: OnStar can only slow down (but not actually kill the engine) on 2010 and later models. All they can do on earlier models is provide a location -- and that must be done through/by the police after you have reported the car stolen.I don't believe our OnStar version h/w has the ability to kill the engine.
Actually GM OnStar started putting this “Slowdown” technology in vehicles in October of 2008 (the beginning of the 2009 model year). 1.7 million Vehicles were to get it the first year. When I got my 2009 Solstice coupe the salesman said my car had it.The good news is that if you have OnStar(tm), they can locate it and / or kill the engine if you report it stolen.
The Neon was well know for being so easy to steal that teenagers often took them for joyrides just because they could.It's crossed my mind because while I don't consider Kappa's being on the most stolen cars list, sometimes criminals do it simply because they want too or can.
I frequently get questioned when someone notices that I lock the doors with my remote even when the top is down. I don't know about other years, but in the '09, using the manual lock knob to unlock a Solstice that was locked via the remote will cause the horn to sound for a minute or two when the door is opened. And when you return to your car, even if the horn has stopped, you will get a couple of chirps from the horn when you unlock it with the remote to let you know that the car has been opened. (It's in the book!)I haven't locked my doors in five years or so since it's a vert. It's not a very large market car so I've really never thought about it getting stolen.