(a)
Upon receipt of the notice required under subdivision (c) of Section 40509.5, the department shall suspend the driving privilege of the person upon whom notice was received and shall continue that suspension until receipt of the certificate required under that subdivision.(b)
The suspension required under subdivision (a) shall become effective on the 45th day after the mailing of written notice by the department.
Source:
Section 13365.2, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH§ionNum=13365.2..