Yes, it is possible. As a co-signer, you should have disclosed this debt and included it when you filed your case. If it was disclosed, all that needs to happen is for the creditor to file a Proof of Claim to get paid along with your other unsecured creditors (after repo and auction, of course). If the creditor does not file a claim after being given notice of the bankruptcy, and you complete the case successfully, the debt would be discharged (assuming you are eligible for a discharge in this case). If you did not list the debt, you will need to file a motion to add a creditor. I am assuming your case was confirmed already.
Answered on Jan 30th, 2012 at 1:21 PM