Does co-signing on a car improve my credit rating?

Agree with bdancer. A cosigner is basically the same as being the official signer. They make no distinction when reporting to the credit bureaus, and they make no distinction if you mess up and they need to come after you (or your mom) in court. So yes, it will help you build your credit.

PS - start using your credit card. Just buy a tank of gas every month and pay it off as soon as you get the bill. Otherwise they may close it due to inactivity, and your credit score may suffer.

Doubt it. You have to establish credit in YOUR OWN NAME. Sorry about the capslock yelling, but you have to prove that you are responsible with credit. When you got mom to cosign, the consumer rating agencies don't know if you or mommy is paying for the vehicle. Again, I apologize, but what you do, not mommie, is what they look at. You have to build up your own credit. If you are responsible and can pay your bills off every single month, then you need to start using a credit card and watching how much you spend. Only then can you create a credit score.

You blew the chance at the Camaro when you had mommie cosign for it.

The loan will show on both credit reports and will count in your FICO score.

I have to wonder where you got that 772 score. That cannot be a FICO score, especially if you only have one credit card that hasn't been used in a year.

at the same time as taking a call on your human being loan approval, your lender will be certain your credit status. the most instantly ahead scoring approach used is FICO rankings. those rankings are oftentimes used for determining your eligibility for mortgages.