This title shall not apply to a written contract executed prior to the effective date of this title, unless either the parties agree by mutual written consent that this title shall apply or such contract is extended or renewed after the effective date of this title.
The provisions of this title shall prevail over any conflicting or inconsistent provisions of the Commercial Code affecting the subject matter of this title.
Source:
Section 1738.9, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CIV§ionNum=1738.9..