The short answer is no. In some ways, getting a cosigner is like a joint auto loan. This is because in both cases it can help you get a loan approval. However, a joint auto loan means that both parties own the car and are responsible for repaying the loan. Joint auto loan applicants both share responsibility for damages caused should there be a car accident. A cosigner does not share joint ownership of the car, however, has a liability to repay the loan if the main applicant fails to make payments.