Cal. Civ. Code § 1654 : CALIFORNIA CIVIL CODE — OBLIGATIONS — CONTRACTS — INTERPRETATION OF CONTRACTS — Interpretation against party causing uncertainty TEXT PDF In cases of uncertainty not removed by the preceding rules, the language of a contract should be interpreted most strongly against the party who caused the uncertainty to exist. Ca. Civ. Code § 1654 Amended by Stats. 1982, Ch. 1120, Sec. 1.