California Code, Vehicle Code - VEH § 16381

In the event that it is made to appear to the court that the judgment debtor has failed to pay any installment as permitted by the order of the court, upon the payment of required fees by the judgment creditor, the court shall give notice of the default to the department and the department shall forthwith suspend the driving privilege of the judgment debtor until the judgment is satisfied as provided in this chapter.The court shall determine the required fees, which shall be commensurate with the cost incurred by the court in carrying out the provisions of this section.