My application received a Pass grade. Does this mean my application is certified for UC P4 data?

No. Information Security and Policy does not "certify" applications. A Pass or Fail grade is intended to indicate whether or not an application meets the campus minimum security requirements for application security at the time at which it was assesssed. 

An application security assessment is intended to find the most critical and high risk vulnerabilities; however, the assessment process is often accelerated due to time and resource constraints meaning all vulnerabilities may not be discovered in a single assessment.