Cal Fam Code 2122(a)

Relief From Judgement

2122. The grounds and time limits for a motion to set aside a judgment, or any part or parts thereof, are governed by this section and shall be one of the following:
(a) Actual fraud where the defrauded party was kept in ignorance or in some other manner was fraudulently prevented from fully participating in the proceeding. An action or motion based on fraud shall be brought within one year after the date on which the complaining party either did discover, or should have discovered, the fraud.