Own a 2011-2016 Chevy Silverado Duramax Diesel 2500HD or 3500HD? The Chevy Silverado diesel engine you paid a $5,000 premium for is allegedly equipped with three cheat devices and emits illegal levels of NOx emissions. You may be entitled to compensation »

Case Status
Motion to Dismiss Denied (In Full or in Part)
U.S. District Court for the Eastern District of Michigan
Case Number
General Motors LLC
Robert Bosch GMBH
Robert Bosch LLC
File Date


  • 2011-2016 Chevy Silverado Duramax Diesel 2500HD
  • 2011-2016 Chevy Silverado Duramax Diesel 3500HD
  • GMC Sierra Duramax »


Duramax Diesel Class Action Infographic

According to the firm's lawsuit, much like VW, Fiat Chrysler and Mercedes, General Motors has allegedly intentionally sold Chevy Silverado Duramax Diesel 2500HD and 3500HD vehicles with emissions-cheating devices that mask the vehicle's release of illegally high levels of NOx. The alleged use of these “defeat devices” means consumers paid a $5,000 premium for a diesel car that is, according to the lawsuit, emitting illegal levels of deadly NOx emissions. 

Attorneys say GM knew consumers would pay more for a powerful and efficient diesel option, and used these devices to obtain the power and performance it wanted, while hiding illegal levels of pollution. If you own an affected Chevy Silverado, fill out the form to find out your consumer rights to compensation. Hagens Berman believes GM has decieved consumers into paying high premiums for what it told consumers were vehicles that were legal and operated within emissions limits.

If you own an affected Chevy Silverado, fill out the form to find out your consumer rights to compensation.


According to the lawsuit, GM intentionally installed multiple emissions-cheating devices in affected Chevy Silverado trucks, in violation of federal requirements. We believe GM was motivated by its desire to increase sales and profits and without cheating emissions, the Silverado trucks could not achieve the fuel economy, range, towing power or performance that GM promised its customers

According to the lawsuit, the alleged emissions-cheating devices engage emissions controls at temperatures within which emissions tests must be done, but outside that temperature range emissions controls are turned down or “de-rated.”

Another alleged defeat device de-rates emissions controls after 5 to 10 minutes of steady (i.e., highway) driving, which attorneys say never happens during an emissions test. The lawsuit claims that these devices combine to allow the trucks to pass emissions tests while masking the vehicle's true output of NOx during actual on-road driving. 

Affected Silverado Duramax diesels allegedly exceed by two- to five-fold the Federal and California NOx emissions limits and cost an estimated $5,000 more than their gasoline equivalent.


Hagens Berman believes that consumers have the right to compensation for the premium price they paid for what they thought was a powerful, efficient and emissions-compliant option. According to the firm's investigation, GM charged consumers high prices for vehicles that are allegedly emitting illegally high emissions, rendering them out of compliance with federal regulations. Simply put, thousands of consumers did not receive what they paid for, and purchased their Silverado under what we believe is false information.


Hagens Berman is one of the most successful auto litigation law firms in the U.S. and is presently leading nationwide cases against GM, Mercedes and Fiat Chrysler for use of diesel emissions-cheating software. Our firm’s independent research outpaces even government agencies, and we are the only firm dedicating its own resources to uncovering new instances of fraud. Hagens Berman has also taken on other automakers on behalf of consumers throughout the United States for safety defects and negligence, and your claim will be handled by attorneys experienced in automotive consumer law.


In no case will any class member ever be asked to pay any out-of-pocket sum. In the event Hagens Berman or any other firm obtains a settlement that provides benefits to class members, the court will decide a reasonable fee to be awarded to the class' legal team.

Hagens Berman purchases advertisements on search engines, social media sites and other websites. Transmission of the information contained or available through this website is not intended to create, and receipt does not constitute, an attorney-client relationship. If you seek legal advice or representation by Hagens Berman, you must first enter a formal agreement. All information contained in any transmission is confidential and Hagens Berman agrees to protect information against unauthorized use, publication or disclosure. This site is regulated by the Washington Rules of Professional Conduct.