GMC Sierra Duramax Diesel 2500 HD & 3500 HD Emissions

DEFENDANT NAME: General Motors LLC, Robert Bosch GMBH, Robert Bosch LLC
CASE NUMBER: 2:17-cv-11661
COURT: U.S. District Court for the Eastern District of Michigan
STATUS: Active
DATE FILED: 05/25/17

Amended Complaint Filed

Hagens Berman filed an amended complaint against General Motors highlighting new details about the cheat and involvement of Bosch. Read the press release »

Sign up for Silverado »

Own a 2011-2016 GMC Sierra Duramax Diesel 2500 HD or 3500 HD?

The GMC Sierra diesel engine you paid a $5,000 premium for is allegedly equipped with three cheat devices that allow your vehicle to emit illegal levels of deadly NOx emissions. You may be entitled to compensation or a buyback.

Fill out the form to find out your consumer rights to potential compensation »


  • 2011-2016 GMC Sierra Duramax Diesel 2500 HD
  • 2011-2016 GMC Sierra Duramax Diesel 3500 HD

According to the firm's lawsuit, much like VW, Fiat Chrysler and Mercedes, GM has intentionally sold GMC Sierra Duramax Diesel 2500 HD and 3500 HD vehicles with emissions-cheating devices that mask the vehicle's release of illegally high levels of NOx. The use of these “defeat devices” means consumers paid a $5,000 premium for a diesel car that is, in fact, emitting illegal levels of deadly NOx emissions. 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 GMC Sierra, find out your consumer rights to compensation. Hagens Berman believes GM has scammed consumers into paying high premiums for what it told consumers were vehicles that were legal and operated within emissions limits.


According to our investigation, GM intentionally installed multiple emissions-cheating devices in affected GMC Sierra trucks, in violation of federal requirements. We believe GM was motivated by its desire to increase sales and profits, and without cheating emissions the Sierra trucks could not achieve the fuel economy, range, towing power or performance GM promised its customers. The 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 defeat device de-rates emissions controls after 5 to 10 minutes of steady (i.e., highway) driving, which never happens during an emissions test. 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 Sierra Duramax diesels 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 reimbursement 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 in fact 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 Volkswagen, 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.


There is no cost or fee whatsoever involved in joining this action. 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. In no case will any class member ever be asked to pay any out-of-pocket sum.

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.

Back to all cases

Contact Us:

Hagens Berman is a national law firm that purchases ads. Submitting this form does not create an attorney-client relationship with the firm, but we will make our best effort to keep your information confidential.


Sierra Duramax Owner Resource Center:

Frequently Asked Questions
Complaint 05/25/17
Silverado Duramax case page

The legal team will post more resources here as the case develops.

Case videos

Case Gallery

Case Timeline

08/04/17: Amended Complaint Filed

Hagens Berman filed an amended complaint against General Motors highlighting new details about the cheat and involvement of Bosch. Read the press release »

Sign up for Silverado »

Related News