I almost bought a new car recently (look at my other threads), but after doing my own affordability assessment, decided against it and decided to keep on driving my old, but paid-up, Honda. But don't get me wrong, I burnt myself this way in the past, and am still pay THOSE school fees.
I would do what has already been stated in this thread, get a settlement letter from the bank, sell the car for as much as you can, and take a knock on the difference between the two. Don't let it get to the point where the bank sends the debt (car?) collectors. Rather contact them and see what arrangement can be made.
B