The vehicle mortgage signature must be the owner himself. Vehicle mortgage must be registered with the vehicle management office. If the owner does not sign, the mortgage registration cannot be carried out, and the mortgage registration can only have legal effect. The subject of mortgage must be himself. I didn't sign the car mortgage contract. If the owner signs a mortgage contract afterwards, the mortgage contract is valid, otherwise the contract is invalid.

Husband and wife enjoy equal rights and obligations to the same property and equal ownership of the same property. Husband and wife * * * and * * * have the same property. Husband and wife have rights and obligations to all shares of the same property, and enjoy the rights of possession, use, income and disposal equally. Among them, the right of disposition is one of the important powers in ownership, which is directly related to the personal and property interests of the parties.

Article 400th of the Civil Code of People's Republic of China (PRC) establishes a mortgage, and the parties shall conclude a mortgage contract in writing.

A mortgage contract generally includes the following clauses:

(1) The type and amount of secured creditor's rights;

(2) The time limit for the debtor to perform the debt;

(3) The name and quantity of the mortgaged property;

(4) the scope of the guarantee.

Article 403 Where a chattel is mortgaged, the mortgage right shall be established when the mortgage contract comes into effect; Without registration, you may not be able to fight well-intentioned third parties.

Article 406 During the mortgage period, the mortgagor may transfer the mortgaged property. Unless otherwise agreed by the parties, such agreement shall prevail. If the mortgaged property is transferred, the mortgage right will not be affected.

Where the mortgagor transfers the mortgaged property, it shall promptly notify the mortgagee. If the mortgagee can prove that the transfer of the mortgaged property may damage the mortgage right, he may require the mortgagor to pay off the debt or deposit the proceeds of the transfer in advance with the mortgagee. The part of the transfer price exceeding the amount of creditor's rights belongs to the mortgagor, and the insufficient part is paid off by the debtor.

Article 407 The mortgage right may not be transferred separately from the creditor's rights or used as a guarantee for other creditor's rights. Where the creditor's rights are transferred, the mortgage right guaranteeing the creditor's rights shall be transferred together, unless otherwise provided by law or agreed by the parties.