What can the co-signer do if the borrower can't make their car payments?

"""the co-signer do if the lender can't"""????????? New one on me... IF the debtor/signor cant/wont make the payments, the co-signor is obligated to make the payments to the lender. The co-signor can demand/beg/plead/con/coerce the signor to let co-signor have possession of the collateral just like the lender will if the payments dont get made. Does that help?