BYD Auto is a manufacturer.
BYD Auto Co. , Ltd. is a Chinese automobile manufacturer based in Xi'an , Shaanxi Province , and a wholly owned subsidiary of BYD Company . Its principal activity is the design , development , manufacture and distribution of passenger cars and buses sold under the BYD brand . In October 2016 , BYD Auto became the all-time second largest global plug-in car manufacturer after the Renault-Nissan Alliance .