There is a video on you tube showing the 'shift-to-park' condition and what's the problem with it. I had to change the whole shifter mechanism, twice, both under regular warranty and the extended one. The dealer said on the 2nd time that GM changed the faulty switch mechanism with a new electrical ruff. So far, no problem yet!Well I took my car to the Dealer and if course during the time they had my car it didn't happen. But they did so a recall while they had my car! ? Of course 2 days later it happened again I had to let it run while I ran in a store because I just couldn't get it to turn off. I did manage to get it to turn off after shifting to park letting it idle and then turning off. I did take a video of it but th e dealer said they couldn't find what was wrong if it didn't do it while they had my car. I'm really afraid one time it's not going to turn off at work or some where that I can't let it run for a little bit.