You will need to have the title to your vehicle to add your spouse's name.
You may not have possession of your title if there is a lien against your vehicle. A lien is a creditor's legal right to sell certain property of a debtor who defaults on his or her obligations. If you have not paid off your car completely, the lender has probably placed a lien on the car, and may hold the title. If you do have a lien on your vehicle, contact the lienholder and ask them about adding your spouse’s name. Typically, the lienholder will have no problem with this. Adding a name to the title makes the added party liable for the amount due to the lienholder. Once the lienholder has given consent to add your spouse, most states require that the lienholder fill out a form stating that they granted permission. These forms will vary depending on your state. To find the form for your state call the local Department of Motor Vehicles or visit the website. If you have lost the original title to your car, you can apply for a replacement. To get a replacement, look at your state’s requirements and visit your local DMV office. Your state's requirements should be available online. Some states require you to submit latest smog test (California) when you change ownership (this includes adding a spouse to a title), but you can submit a statement of facts which will exempt this requirement because your spouse is a family member. Some states, such as California, allow you to have paperless title. Therefore, you need either the California Certificate of Title or an Application for Duplicate or Paperless Title.