Could vehicle get repo if co buyer is in bankruptcy?

The short answer is no. As long as you are making the payments the car will not be repossessed. When the co-buyer goes before the bankruptcy judge they can have the car included or excluded from the bankruptcy. If it's included then the car will be "voluntary" repossessed. If it's excluded then everything is "business as usual" for you. The key is to keep your payment current and on time.