DETROIT -- eBay Motors says it wants to build on an agreement with General Motors by adding other automakers' certified used-vehicle programs to its online listings of cars and trucks for sale.

In February, eBay and GM signed a deal that will enable about 3,900 GM dealers in the United States to list their inventories of certified used vehicles on eBay's automotive auction Web site.

Rob Chesney, eBay Motors vice president, said today the company is talking with other automakers, which he declined to identify, about similar agreements. Chesney said eBay expects to make an announcement this year.

Under the eBay-GM deal, the first GM Certified vehicles will be listed by the end of June. Executives of eBay said details of how dealers will place the vehicles on the site remain to be resolved.

Curtis Kroecker, director of vehicles for eBay Motors, said it is unclear who will upload the photos, descriptions and pricing information for GM dealerships' certified vehicles. He said "eBay will provide an automated way for GM dealers to load inventory."

Chesney said eBay will tweak the system once it is running. Each dealership's Internet manager could be responsible for uploading some vehicle data. It can be time consuming to photograph vehicles in detail, load the pictures onto the eBay site and add information such as vehicle mileage, equipment and condition.

On other topics, eBay executives said today:

• Improving the security of online vehicle sales is a priority. Chesney said eBay has 2,000 staffers who handle complaints and investigate sham auctions and dishonest sellers.

"We've made it very hard for anyone who is not a legitimate seller to be in our marketplace," Chesney said.

• eBay is considering a low-cost local auction or sales venture that would compete with Craigslist.com, a free online classified site.

The parent auction company launched eBay Motors in 2000. Executives said the automotive site generates $18 billion a year in transaction value.