The Environmental Protection Agency ordered the recall of 500,000 big-rig trucks because of faulty pollution controls.

"This recall is the largest voluntary truck emissions recall to date," EPA said in a statement.

The global engine maker Cummins will voluntarily recall roughly 500,000 medium- and heavy-duty trucks for model years 2010-2015, the agency said. The problem with the trucks stems from a failed component of the catalytic converter emission control system. The engine-maker is taking action to fix the problem.

EPA made clear that the recall was not the result of "defeat device," which in the past had be used by companies like Volkswagen to intentionally thwart pollution regulations.

"The problem Cummins is acting to correct is the result of a defective part and does not involve a defeat device," the agency said.

The EPA did not announce any punitive actions against the company, such as fines for not meeting pollution standards.

“Today’s recall is a great example of how government and industry work together to protect health and the environment.” said Bill Wehrum, EPA’s air pollution office head. “This is the way it’s supposed to work,” he said. “Our follow-up testing seeks to make sure that pollution controls work throughout an engine’s useful life. And, if they don’t, then companies step up to set things right.”