GM accused of using 'defeat devices' in diesel trucks in proposed lawsuit


General Motors Co was accused in a lawsuit yesterday of rigging hundreds of thousands of diesel trucks with devices similar to those used by Volkswagen AG, to ensure they pass emissions tests.

A lawsuit on behalf of 705,000 GM Silverado and Sierra diesel truck owners alleges the vehicles have technology on them created to beat emissions tests.

A Seattle-based law firm filed a civil lawsuit against the USA automaker in MI court on Thursday, alleging that GM presently has about 700,000 diesel vehicles on the road in the United States that are equipped with the so-called "defeat devices".

General Motors (GM) rigged emissions controls in its diesel vehicles, law firm Hagens Berman said Thursday.

The suit also names German auto supplier Bosch as a defendant.

Bosch said it was taking the "allegations of manipulation of the diesel software very seriously" and cooperating with the various investigations, Linda Beckmeyer, a company spokeswoman, said in a statement.

General Motors (GM) was accused today of implementing devices created to cheat diesel emissions tests, similar to those used by Volkswagen (VLKAY) , Reuters reports.

GM joins VW, which has admitted to cheating, and at least four other automakers whose diesel emissions have been scrutinised by regulators or consumers.

GM has denied the charges' validity, calling the lawsuit "baseless". More than 705,000 Duramax-equipped pickups could be impacted by the suit. The automaker is alleged to have programmed the emissions software to relax or "derate" its emission controls after five to 10 minutes of steady highway driving-a use case that isn't part of an emission test cycle.

The same law firm filed a similar suit past year against General Motors in California. You may also contact Phillip Kim or Kevin Chan of Rosen Law Firm toll free at 866-767-3653 or via email at or

GM erased gains in early trading and fell as much as 3.9% after the lawsuit was filed. This week, the U.S. Justice Department sued Fiat Chrysler Automobiles, alleging violations of clean-air rules.