S.C. Code Ann. § 56-10-30: Automatic suspension of registration upon lapse or termination of security.

If at any time the security required of any person under Section 56-10-20 lapses or terminates, the certificate of registration of the motor vehicle for which the security was in effect and the owner's driving privileges are, as of the date the security lapses or terminates, automatically suspended and must remain suspended until the security is replaced.