California Code, Family Code - FAM § 2122

(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.

(b) Perjury.  An action or motion based on perjury in the preliminary or final declaration of disclosure, the waiver of the final declaration of disclosure, or in the current income and expense statement shall be brought within one year after the date on which the complaining party either did discover, or should have discovered, the perjury.

(c) Duress.  An action or motion based upon duress shall be brought within two years after the date of entry of judgment.

(d) Mental incapacity.  An action or motion based on mental incapacity shall be brought within two years after the date of entry of judgment.

(e) As to stipulated or uncontested judgments or that part of a judgment stipulated to by the parties, mistake, either mutual or unilateral, whether mistake of law or mistake of fact.  An action or motion based on mistake shall be brought within one year after the date of entry of judgment.

(f) Failure to comply with the disclosure requirements of Chapter 9 (commencing with Section 2100).  An action or motion based on failure to comply with the disclosure requirements shall be brought within one year after the date on which the complaining party either discovered, or should have discovered, the failure to comply.