p The Volkswagen diesel scandal has brought increased scrutiny on automakers peddling diesel vehicles, and now General Motors is facing some of that heat.

A class-action lawsuit filed in federal court in Detroit accuses GM of using three “defeat devices” in its Duramax diesel engines to cheat on emissions tests.

The suit was filed on behalf of 705,000 people who own or lease 2011-2016 Chevrolet Silverado and GMC Sierra heavy-duty pickup trucks.

The suit does not include light-duty versions of the Silverado or Sierra, which don’t offer diesel engines, or diesel Chevy Colorado and GMC Canyon trucks, which use different engines that share the Duramax branding.

“These claims are baseless and and we will vigorously defend ourselves,” a GM spokesperson told Reuters, adding that the trucks in question comply with both federal Environmental Protection Agency emissions standards and California’s stricter standards.

Supplier Bosch was also named as a defendant for having allegedly helped develop the “defeat devices,” but the company would not comment on the litigation.

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