That's not going to happen. Unless the dealership is doing the financing in-house, they're already paid for the vehicle, via the loan you took out from the finance company to get the vehicle. It's the finance company you'd answer to re: the payment, not the dealership.
Thus far, I've never heard of any such thing happening - miss a certain number of payments, and the finance company sends repossession agents to collect the vehicle. However, it's not beyond the realm of possibility - vehicles with systems such as OnStar can be shut off remotely, and, although I have yet to hear of it happening, it is possible that a finance company could request OnStar disable the vehicle.
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