Cummins is accused of installing defeat devices or similar equipment on hundreds of thousands of RAM pickup trucks between 2013 and 2023, the department said.
“The types of devices we allege that Cummins installed in its engines to cheat federal environmental laws have a significant and harmful impact on people’s health and safety," Attorney General Merrick B. Garland said in a statement, adding that the devices would have produced thousands of tons of excess emissions of nitrogen oxides, which are toxic to humans when breathed in.
Cummins has also agreed to settle with California's Air Resources Board.
In a statement, Cummins said it did not admit any wrongdoing and that it had no evidence its employees acted in bad faith. A spokesperson for Stellantis, which owns the RAM truck brand, did not immediately respond to a request for comment.
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In August 2022, Fiat Chrysler — now known as Stellantis — paid nearly $300 million to resolve a multiyear criminal-fraud probe by the Justice Department over diesel-emissions.
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