Total Chinese auto sales, including trucks and buses, rose 19.7 percent to 1.9 million vehicles, according to CAAM.
Passenger vehicle sales for the first nine months totaled 12.8 million vehicles, up 7.5 percent from the same period last year. Total vehicle sales rose 12.7 percent to 15.8 million in the first three quarters.
September traditionally is a strong month for Chinese auto sales ahead of the weeklong National Day holiday that starts Oct. 1.
The spat between Beijing and Tokyo over uninhabited islands in the East China Sea caused sales of Japanese brands to tumble by 40 percent last September.
China's domestic automakers, struggling to hold market share against global rivals, saw September sales rise just 1.8 percent over last year to 276,200 vehicles.
General Motors Co. said sales of GM brand vehicles by the company and its local partners rose 13.7 percent over a year earlier to a new September record of 277,647 vehicles.
Ford Motor Co. said its sales soared 61 percent to 96,111 vehicles.
Germany's BMW AG said sales, including by its Mini unit, rose 20.8 percent to 35,408 vehicles.
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China Association of Auto Manufacturers: www.caam.org.cn