G. M. Accused in Lawsuit of Deceit on Diesel Truck Emissions - By NEAL E. BOUDETTEMAY 25, 2017 A Seattle law firm that specializes in suing automakers has filed a class-action lawsuit against General Motors, accusing the company of programming some of its heavy-duty pickup trucks to cheat on diesel emissions tests. The suit was filed by Hagens Berman Sobol Shapiro, a law firm that specializes in class actions and that previously filed a diesel-emissions suit against G. M. related to the Chevrolet Cruze compact and another against Fiat Chrysler; those suits are pending. The suit accuses the company of using software that helps the diesel versions of Chevrolet Silverado 2500HD and GMC Sierra 2500HD heavy-duty pickup trucks with Duramax engines meet emissions requirements. In response to the suit, G. M. said heavy-duty trucks with its Duramax diesel engine complied with all emissions regulations of the Environmental Protection Agency and the California Air Resources Board, which plays an influential role in vehicle emissions. Steve W. Berman, a partner, said the firm had hired its own engineers to test diesel vehicles after Volkswagen acknowledged in 2015 that it had cheated on emissions tests. Hagens Berman said the suit was based on tests it conducted on a 2013 Silverado 2500HD with about 51,000 miles on the odometer.
