Five different criteria play a major role in calculating FICO's auto credit score: credit history length, payment history, credit types used, new credit and outstanding balances.

Your payment history plays biggest role in your auto credit, however it is only one of many other aspects. Timely payments on your credit cards, loans and mortgages will make its impact in making or breaking your auto credit. Are you paying your bills on time? How much debt do you owe? If you were late on your payment, how often and how recently it has been? If you are paying on time your auto credit will be high.

Your outstanding balances impact your auto credit score as well. If you have many credit cards and many of them are at or near limits than your auto credit will be affected in adverse way.

Auto credit history is length of your credit report. If have just started building your credit, your auto credit score will not so good.

If you are acquiring new credit, it will reflect with high score auto credit. Your use of different credit types also accounts for auto credit.

We have seen how auto credit score is calculated. As per FICO's website, auto credit score falls from 300 to 850. The higher the auto score, the better interest rates you can get with your auto loan. If your auto credit score is 720 or above you are among prime borrowers who can get the lowest interest rate auto loans. But you will come down to subprime borrowers' list if your auto credit score is 680 or below. You can still get auto loans but you will have to pay higher interest rate. Different lending institutions operate with different criteria to evaluate your auto credit score, so shop around till you get the best option.