) --

General Motor's

trial program with


(EBAY) - Get Report

, which allowed the carmaker to sell vehicles in California through eBay's auto marketplace, will end tomorrow after six weeks.

The site allowed car buyers to negotiate a price with a dealer or buy a car at a fixed price and pick it up at the dealership.

The trial was originally slated to end Sept. 8, but was extended. During those six weeks, the site received 1.5 million visits, providing 15,000 leads for dealers, GM spokesperson John McDonald said, but it was difficult for the companies to track how many vehicles were actually purchased through the program.

The program was one of GM's first major moves after it emerged from bankruptcy in July.

GM plans to shift its focus to its newest initiative, a money-back-guarantee program that allows unsatisfied buyers to return cars for a refund.

-Reported by Jeanine Poggi in New York.

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