Tenn. Code Ann. § 55-24-102

If a new motor vehicle does not conform to all applicable express warranties and the consumer reports the nonconformity, defect or condition to the manufacturer, its agent or its authorized dealer during the term of protection, the manufacturer, its agent or its authorized dealer shall correct the nonconformity, defect or condition at no charge to the consumer, notwithstanding the fact that the repairs are made after the expiration of the term. Any corrections or attempted corrections undertaken by an authorized dealer under this section shall be treated as warranty work and billed by the dealer to the manufacturer in the same manner as other work under warranty is billed.