from an earlier and different thread I found this answer about pcc below:michelv said:Hi Sooni
We have submitted supervise medical, PCC & Landing fees with additional documents which were received by them on 16th Sep 2014 as informed by CPC Mississauga vide letter dated 01.12.2014. PCC was issued in August 2014 valid upto Feb2014 in the meantime my father landed in Canada on supervisa and he is in Canada since November 2014 till date. Socan any forum member advise on the basis of past reference or experience as to whether freshh PCC is required though my father is in Canada since Nov 2014 and sponsorship approval received on 18th Feb,2014. In my opinion if new PCC is required perhaps same has to be obtained from Canada itself. So all are requested to give their opinion as to whether(1)new PCC is required especially when father landed in Canada in Nov2014 still here(2) whether super visa medical done in Feb 2014 is still valid for PR Regards
According to EG7 guide:
"You may begin to gather your police certificates before submitting your
application to the CIO. Although you will not submit the police certificate
to the CIO, you must be ready to submit them to a visa office if your
application is recommended for further assessment at a Canadian visa
office. When you submit the application to the visa office please ensure
that your certificates were not issued more than three months before you
submitted your application to the CIO."
My own understanding was from reading other threads and posts is that you submit a pcc within 3 months of its issue date. It has no validity but usually is not asked for again unless more than 12 months have passed since previous date of pcc.