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Since the check was postdated when you gave it to them, they can't pursue criminal charges against you for check fraud since they knew it was not negotiable when they accepted it.
But what they can and likely will do is repo the car, sell it at public auction, and then sue mother for any deficiency between what it sells for and what is owed on it.
So I would suggest going down with the money to them because otherwise mother will likely be out of a car very soon and also owe a big deficiency for a car she doesn't even own any more if they sell it.