CIC may not accept it unless it is requested by them. You should wait for CIC to ask for PCC.
According to the Application Guide.
Police certificates
Police certificates for parents and grandparents applications are not required at the time you submit your complete application. Police certificates will be requested by the processing office for the person being sponsored and each family member 18 or older (who are not already Canadian citizens or permanent residents) later in the application process.
You don’t need police certificates when you submit your complete application. We ask you for police certificates for the person being sponsored and each family member 18 or older (who aren’t already Canadian citizens or permanent residents) later in the application process.
Police certificates are generally valid for 1 year from the date they’re issued. Depending on processing times, we may ask you for new certificates.
https://www.canada.ca/en/immigration-refugees-citizenship/services/application/application-forms-guides/guide-5772-application-sponsor-parents-grandparents.html