General Motors Chief Executive Mary Barra said on Thursday the automaker will expand testing of self-driving vehicles to Michigan, and will build its next generation of self-driving cars in the Michigan plant that builds the Chevrolet Bolt electric car.
Separately, Barra declined to discuss a statement by a Chinese government official that a U.S. automaker could be subject to penalties for price-fixing.
"I don't think anyone benefits from speculating on that," Barra told reporters at the event in GM's downtown Detroit headquarters.
China is GM's largest single market, accounting for 37.6 percent of the automaker's global vehicle sales during the first nine months of 2016, compared with 31 percent for the United States.
Chinese officials did not name the automaker in their comments to the official China Daily.
Investors sold down shares of GM and rival Ford on Wednesday after the statement, which was seen by analysts and foreign policy experts as a warning by Beijing to President-elect Donald Trump not to upset the status quo in relations between the two countries.
GM has been accelerating its efforts to deploy self-driving cars, earlier this year buying autonomous driving startup Cruise Automation. GM and Cruise engineers have been testing self-driving prototypes in Arizona and California.