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A lawsuit filed on behalf of HD truck owners claims GM used a "defeat device."

[Update: Added statement from General Motors.]

A lawsuit filed by Hagens Berman on behalf of heavy-duty General Motors pickup owners accuses the company of using a "defeat device" in its Duramax diesel engine controls in more than 700,000 trucks sold between model years 2011 and 2016.

The suit alleges that GM's heavy duty trucks emit between two and five times the legal limit of NOx pollutants. In the complaint, firm managing partner Steve Berman says, "These GM trucks likely dumped as much excess poisonous emissions into our air as did the cheating Volkswagen passenger cars."

Unlike Volkswagen and FCA, who have both come under scrutiny from federal and state governments for its emissions control systems, GM is being pressured only by owners. Company spokesperson Tony Cervone told Bloomberg that the lawsuit is "without merit."

GM spokesperson Pat Morrissey said, "These claims are baseless and we will vigorously defend ourselves. The Duramax Diesel Chevrolet Silverado and GMC Sierra comply with all U.S. EPA and CARB emissions regulations."

Hagens Berman is also representing owners in ongoing lawsuits against Mercedes-Benz (also for diesel concerns), Tesla (over Autopilot feature content), and Ford (alleging under-specced cooling in the Shelby GT350 Mustang).