Cummins controversies
Controversies tied to this brand in public sources. A listing is not a finding of fault.
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1998
Clean Air Act emissions-control case
The EPA alleged that Cummins and other diesel-engine manufacturers used electronic controls that behaved differently during certification testing and normal highway operation, reducing emissions controls outside the laboratory. Cummins was included in fines totaling $83.4 million across the manufacturers, alongside commitments to corrective action and additional spending.