DETROIT • General Motors said it will launch a new, online used vehicle market called Carbravo that will allow the automaker and its dealers to challenge Carvana, Carmax and others profiting from selling secondhand vehicles.

GM’S Carbravo site will aggregate vehicles owned by Chevrolet, Buick and GMC dealers, as well as cars and trucks that GM Financial, the automaker’s consumer finance arm, controls after taking them back from rental car agencies or vehicle leases. GM officials said the company’s dealers have about 400,000 used vehicles in stock.

GM said Carbravo will launch to consumers this spring.

About 40 million used vehicles are sold annually in the U.S., more than twice the number of new cars and trucks. Auto manufacturers are largely removed from the profits from those sales, as well as information about customers and the opportunity to sell recurring revenue services such as satellite radio subscriptions.