What is the most that can happen to me. I sold my brother my car and he made a left trun and a car hit him I?

still had plats and ins on the car. I hadn't gotten around to get that information. the car is totaled out and now is in the impound. If I don't pay $500 for the car being in the impound and just sign the tittle to Quality towing can they put that on my credit?