You are going to take a hit since your sonic is so new. So much of a hit that a loan company might not roll over the money you owe into a different car. We are in the same situation. Just got 2012 altima coupe last year. We had a baby and the coupe doesn't work so well. Tried trading it in but no one would give very much for it so were stuck with the coupe. I don't want to roll over the extra thousands of dollars we owe on the altima into a different car. We would be upside down way too much.