Cal. Welf. & Inst. Code § 262

Upon motion of the minor or his or her parent or guardian for good cause, or upon his or her own motion, a judge of the juvenile court may set aside or modify any order of a juvenile hearing officer, or may order or himself or herself conduct a rehearing. If the minor or parent or guardian has made a motion that the judge set aside or modify the order or has applied for a rehearing, and the judge has not set aside or modified the order or ordered or conducted a rehearing within 10 days after the date of the order, the motion or application shall be deemed denied as of the expiration of that period.