There are several options you can pursue if you end up finding permanent employment during your loan term. If you have the means to do so, you can pay above the minimum requirements to have your entire amount repaid ahead of its scheduled end date (which can be done free of charge with some lenders).
Alternatively, you might look to refinance your car loan to access a better interest rate, which is likely to be available with greater job stability. You shouldn’t do this straight away, though, as your lender will want to be certain that your new employment lasts beyond your probationary period.