Plaintiffs have sued GM alleging that model year 2011-2016 Chevrolet Silverado and GMC Sierra trucks with a Duramax diesel 6.6L V8 LML engine were equipped with a defective high-pressure fuel injection pump known as the CP4. Plaintiffs allege that the CP4 is unreasonably fragile and susceptible to catastrophic failure. Plaintiffs allege the failure occurs after the CP4 has worn against itself so much that it generates metal shavings which contaminate the entire high-pressure fuel injection system, sometimes leading to engine shutdown with the inability to restart. 

Plaintiffs claim that GM knowingly concealed the alleged CP4 fuel pump defect. Plaintiffs have filed a class action lawsuit against GM for the above-listed state-specific claims arising out of GM’s conduct. Plaintiffs further claim that they and other owners of the Class Vehicles have suffered economic damages as a result of the alleged defect. This lawsuit does not involve any claims for personal injuries. For more information about the claims in this lawsuit, please refer to the Second Amended Consolidated Class Action Complaint.

GM denies any wrongdoing and denies that the Class Vehicles’ fuel pumps are defective. GM has asserted a number of defenses to Plaintiffs’ claims. For more information about the defenses GM asserts in this lawsuit, please refer to GM’s Answer to Plaintiffs’ Second Amended Consolidated Class Action Complaint.

This case is currently pending before Judge Terrence G. Berg in the United States District Court for the Eastern District of Michigan. The lawsuit is known as Chapman, et al., v. General Motors LLC, Case No. 2:19-cv-12333-TGB-DRG.

The Court has certified certain state-specific causes of action to proceed as a class action (known as “certifying” the class), and has ordered the parties to notify the potential Class Members about their rights so they can decide whether they will stay in the Class.

The Court certified the following seven state-specific Classes:  

1. The California Class: All persons who purchased a 2011-2016 Duramax diesel 6.6L V8 LML engine truck from a GM-authorized dealer in the state of California between March 1, 2010, through September 6, 2023. 
2. The Florida Class: All persons who purchased a 2011-2016 Duramax diesel 6.6L V8 LML engine truck from a GM-authorized dealer in the state of Florida between March 1, 2010, through September 6, 2023.
3. The Illinois Class: All persons who purchased a 2011-2016 Duramax diesel 6.6L V8 LML engine truck from a GM-authorized dealer in the state of Illinois between March 1, 2010, through September 6, 2023.
4. The Iowa Class: All persons who purchased a 2011-2016 Duramax diesel 6.6L V8 LML engine truck from a GM-authorized dealer in the state of Iowa between March 1, 2010, through September 6, 2023. 
5. The New York Class: All persons who purchased a 2011-2016 Duramax diesel 6.6L V8 LML engine truck from a GM-authorized dealer in the state of New York between March 1, 2010, through September 6, 2023.  
6. The Pennsylvania Class: All persons who purchased a 2011-2016 Duramax diesel 6.6L V8 LML engine truck from a GM-authorized dealer in the state of Pennsylvania between March 1, 2010, through September 6, 2023.  
7. The Texas Class: All persons who purchased a 2011-2016 Duramax diesel 6.6L V8 LML engine truck from a GM-authorized dealer in the state of Texas between March 1, 2010, through September 6, 2023.

You can check whether you have a Class Vehicle by entering your Vehicle Identification Number ("VIN") here.

Yes, if you purchased a Class Vehicle from a GM-authorized dealership in California, Florida, Illinois, Iowa, New York, Pennsylvania, or Texas, you are a member of that state’s Class even if you no longer own the vehicle.

If you are still not sure whether you are a member of one of the state-specific Classes defined above, you can review documents on the Important Documents page or call or write to Class Counsel, at the phone number listed in FAQ 17 or addresses in FAQ 12.

In a class action lawsuit, the people who bring the lawsuit are called “Plaintiffs” or “Class Representatives.” They sue on behalf of themselves and other people who have similar claims, known as “Class Members.” All of the people together are called a “Class;” in this case, the seven (7) Classes have been defined on state-specific bases. The company the Class Representatives sue (in this case, General Motors LLC) is referred to as the “Defendant.”

A class action allows a court to resolve claims or decide common issues for the entire Class or Classes without requiring each Class Member to file their own separate, individual lawsuit. All of the members of the Class are bound by the result of the class action lawsuit, except for those people who choose to exclude themselves from the Class. The deadline to exclude yourself from the Class was December 21, 2023. 

The Court and a jury will hear the evidence and arguments presented by both sides and will decide who should prevail on each of the state-specific Class claims delineated above.

More information about why the Court chose to certify these seven (7) state-specific Classes is in the Court’s March 31, 2023 order on class certification, which is available on the Important Documents page.

The Court has not ruled on the merits of this lawsuit. That will be done through future proceedings in this case. By certifying the above-listed seven (7) state Classes, the Court is not suggesting that Plaintiffs or GM will win or lose this case. Plaintiffs must prove their position on the seven (7) certified state Classes’ causes of action, and GM will have an opportunity to rebut Plaintiffs’ positions and advance its own evidence in opposition.

Plaintiffs are asking the Court to find that the Class Vehicles share a common defect in the CP4 high-pressure fuel injection pump, and that GM knew and concealed the defect from Class Members and otherwise acted unlawfully. Plaintiffs will ultimately seek an award for damages from GM, including payment for the money that they allegedly overpaid to buy their defective Class Vehicles, if the truck was fixed the costs of repair, legal fees and costs, and other relief sufficient to compensate for GM’s allegedly unlawful acts. For more information about the claims in this lawsuit, please refer to the Second Amended Consolidated Class Action Complaint and the Court’s March 31, 2023 order on class certification, available here.

This lawsuit is still pending and there is no money available to any Class Members at this time. The Court or a jury must still decide the merits of the state-specific claims listed on pages 1 and 2 of the Notice. If Plaintiffs are able to prove these claims, and sufficiently prove damages on a Class-wide basis, then the Court will establish an administrative system for the disbursement of any monies recovered.

You are automatically a Class Member if you fall within the Class definitions in FAQ 3. If you wish to participate in this class action and remain as a Class Member, you do not need to do anything at this time.

By staying in the state-specific Class, you and all other state-specific Class Members will be included in whatever outcome is reached for that Class in this case. This includes the possibility of receiving any compensation that may be later available to Class Members through a Class settlement, if the Parties were to agree to one.

If you remained in the Class, you will not be able to separately sue GM about the allegedly defective CP4 high-pressure fuel injection pump on an individual basis. This means that regardless of the outcome in this case, you and all other Class Members will be legally bound by all of the orders and judgments that the Court issues for the Classes, and you cannot sue GM separately to change that result.

The deadline to exclude yourself from the Class was December 21, 2023. 

IF YOU EXCLUDED YOUSELF: (1) you will NOT be entitled to share in any relief from any settlement or judgment that results from this lawsuit; (2) you will NOT be bound by any judgment or settlement release entered in this lawsuit; and (3) at your own expense, you MAY pursue any claims that you have against GM by filing a separate lawsuit.

The Court has appointed the law firms of Hagens Berman Sobol Shapiro LLP, Hilliard Law, and The Miller Law Firm to represent Plaintiffs and the Class Members in this litigation. These law firms are known as “Class Counsel” and they are listed below.

HAGENS BERMAN SOBOL SHAPIRO LLP
1301 Second Avenue, Ste. 2000
Seattle, WA 98101

HILLIARD LAW
719 S. Shoreline Blvd.
Corpus Christi, TX 78401

THE MILLER LAW FIRM, P.C.
950 West University Drive, Ste. 300
Rochester, MI 48226

The Court has appointed Class Counsel to represent all members of the Classes in this case for purposes of the claims identified on pages 1-2 of the Notice. If you did not exclude yourself, Class Counsel will continue to work on your behalf to seek the best outcome for that Class. You may make an appearance in the case through another attorney if you choose, with a separate arrangement with that counsel.

If you excluded yourself, you will need to decide whether to hire your own attorney or represent yourself if you choose to pursue any legal action. The deadline to exclude yourself was December 21, 2023. 

If Plaintiffs prevail, Class Counsel will ask the Court to award fees and expenses at the conclusion of the case, which may be paid from GM or out of a portion of any compensation obtained for the Classes through a Class settlement. You will not have to pay out of pocket for any of Class Counsel’s fees and expenses, regardless of the outcome of this case.

The Court has not yet scheduled a trial date to decide who is right in this case.

The trial in this case will address the merits of the claims identified on pages 1-2 of the Notice and the home page of this Website. You do not need to attend that trial. Class Counsel will present the case for the Plaintiffs and the Classes, and GM will present its defenses. At the conclusion of trial, the Court or a jury will determine the verdict(s) based on the evidence presented.

The Long Form Notice contains a summary of the relevant Court papers. You may view the Long Form Notice and other court documents, including the Court’s Order on Class Certification, the Second Amended Consolidated Class Action Complaint, and Defendant’s Answer, by visiting the Important Documents page. Please check this website regularly for updated information regarding the lawsuit. You may also access the Court’s publicly available legal files at the U.S. District Court for the Eastern District of Michigan in Detroit, Michigan.

For more information, please call the Notice Administrator toll-free at 1-866-848-0815. You may also contact Class Counsel by calling 1-206-623-7292.