"WASHINGTON/DETROIT - Cummins Inc has agreed to recall about 500,000 medium- and heavy-duty trucks in the United States to correct a faulty emissions control system in the engines it made for the trucks, the U.S. Environmental Protection Agency said on Tuesday.

The EPA said the Cummins recall of vehicles produced between 2010 and 2015 was the largest ever voluntary recall of trucks due to emissions problems. The catalytic reduction systems were found to be less durable than required and will be replaced, it said.

A spokesman for Cummins said the recall was “in the best interests of our customer and the environment.”"

Reuters had the story July 31, 2018. [2]