An Indian company has received long-awaited approval from the U.S. Environmental Protection Agency to import diesel pickup trucks into the United States, but whether an Atlanta-based company will distribute the vehicles remains unclear.

Global Vehicles U.S.A. Inc. had exclusive rights to import the pickups into the United States and signed up 350 dealers. The company in June sued the manufacturer, Mahindra & Mahindra Ltd., in federal court over repeated delays in delivering the trucks.

That lawsuit is still pending. Meanwhile, Mahindra posted a brief press note on ...