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German automaker Daimler, parent company to the Mercedes-Benz and Smart car brands in the U.S., says it is conducting an investigation into how it certifies its emissions at the request of the U.S. Department of Justice.

The disclosure comes as another German automaker, Volkswagen, deals with fallout from its disclosure that it added software to its diesel-powered cars to allow them to cheat in emissions testing. But Daimler's report didn't focus just on diesels, but its emissions program in general.

"Daimler is cooperating fully with the authorities. Daimler will consequently investigate possible indications of irregularities and of course take all necessary actions," the disclosure said.

aimler says it received the request on April 15. It is required by German securities laws to disclose such requests and put out a statement that says it was asked "to review its certification and admissions process related to exhaust emissions in the United States by way of an internal investigation."

A Daimler spokesman in New York, Han Tjan, said he didn't have any further details on the nature of issue involved.