75 Pa.C.S. § 1309

At least 60 days prior to the expiration of each registration, the department shall send to the registrant an application for renewal of registration. Upon return of the application, accompanied by self-certification of financial responsibility and the applicable fee or fees, the department shall send to the registrant a renewed registration card. An application for renewal of registration for a motor carrier vehicle shall also be accompanied by self-certification of current safety inspection. Failure to receive a renewal application shall not relieve a registrant from the responsibility to renew the registration.