Cal. R. 2.30
This sanctions rule applies to the rules in the California Rules of Court relating to general civil cases, unlawful detainer cases, probate proceedings, civil proceedings in the appellate division of the superior court, and small claims cases.
In addition to any other sanctions permitted by law, the court may order a person, after written notice and an opportunity to be heard, to pay reasonable monetary sanctions to the court or an aggrieved person, or both, for failure without good cause to comply with the applicable rules. For the purposes of this rule, "person" means a party, a party's attorney, a witness, and an insurer or any other individual or entity whose consent is necessary for the disposition of the case. If a failure to comply with an applicable rule is the responsibility of counsel and not of the party, any penalty must be imposed on counsel and must not adversely affect the party's cause of action or defense thereto.
Sanctions must not be imposed under this rule except on noticed motion by the party seeking sanctions or on the court's own motion after the court has provided notice and an opportunity to be heard. A party's motion for sanctions must (1) state the applicable rule that has been violated, (2) describe the specific conduct that is alleged to have violated the rule, and (3) identify the attorney, law firm, party, witness, or other person against whom sanctions are sought. The court on its own motion may issue an order to show cause that must (1) state the applicable rule that has been violated, (2) describe the specific conduct that appears to have violated the rule, and (3) direct the attorney, law firm, party, witness, or other person to show cause why sanctions should not be imposed against them for violation of the rule.
In addition to the sanctions awardable under (b), the court may order the person who has violated an applicable rule to pay to the party aggrieved by the violation that party's reasonable expenses, including reasonable attorney's fees and costs, incurred in connection with the motion for sanctions or the order to show cause.
An order imposing sanctions must be in writing and must recite in detail the conduct or circumstances justifying the order.
Cal. R. Ct. 2.30