• On October 4, 2022, a jury returned a verdict in favor of the Plaintiffs on the certified claims for the three classes. No final judgment has been entered, and no money is available to class members at this time. General Motors Motors intends to appeal if the Court enters judgment. A copy of the Jury Verdict is available here. Please continue to check this website for updates.
  • On June 18, 2024, the Court order that notice be provided regarding Class Counsel’s request for Attorneys’ Fees and Costs. More information including copies of Class Counsel’s Motion can be found here. Please continue to check this website for updates.

Received notice about the Colorado Class litigation? Click here

Nature of the Case

The Court certified a class action lawsuit and that your rights may be affected. The lawsuit alleges defects in certain 2011-2014 Chevrolet Avalanche, Silverado, Suburban, Tahoe, and GMC Sierra, Yukon, and Yukon XL vehicles equipped with Generation IV LC9 5.3 Liter V8 Vortec 5300 engines (“LC9 Engines”). Judge Edward M. Chen of the United States District Court for the Northern District of California is overseeing this lawsuit.  The lawsuit is known as Siqueiros et al. v. General Motors, LLC, and the case number is 3:16-cv-07244-EMC.

Am I in a Class?

The “Class Vehicles” are: 2011-2014 Chevrolet Avalanches, Silverados, Suburbans, Tahoes, and 2011-2014 GMC Sierras, Yukons, and Yukon XLs with LC9 engines and manufactured on or after February 10, 2011. Any vehicle that has already received adequate piston replacement (i.e. upgraded piston rings) is excluded from the class. Class members are all current owners or lessees of a Class Vehicle who purchased or leased the vehicle (a) in the State of North Carolina, (b) from a GM-authorized dealer in Idaho, or (c) purchased or leased in new condition in the State of California.



Option and Deadline

Your Legal Rights

Complete a W-9

To facilitate any payment that you may ultimately be entitled to in connection with the lawsuit, please complete and submit an IRS Form W-9 Here. The Form W-9 may also be submitted by mail to: GM 5300 LC9 Class Action, P.O. Box 5124, Baton Rouge, LA 70821. If you do not return the W-9 form, a portion of your payment, up to 24%, may be subject to backup withholding under relevant tax law.

Object To the Attorneys’ Fees

By September 6, 2024

Class Counsel has filed two motions requesting their attorneys’ fees and the costs that they expended in litigating this lawsuit. The requested “statutory” attorneys’ fees and costs will, if granted by the Court, be paid by General Motors. The requested “common fund” attorneys’ fees and costs will, if granted by the Court, be paid from the amount awarded to the Class members. Class Counsel has also requested service awards on behalf of the three plaintiffs who litigated this action as class representatives. The motions requesting attorneys’ fees, costs, and service awards may be found here. A hearing on the motions has been set for September 19, 2024 before the Honorable Edward M. Chen. Any Class member may object to the motions. Any such objections must be submitted by September 6, 2024 and may be submitted here. for filing with the Court. Prior to September 6, 2024, Class members may request access to sealed records referenced in the motions by emailing info@gmenginelitigation.com or writing to GM 5300 LC9 Class Action, PO Box 5124, Baton Rouge, LA 70821. Class Counsel may object to any such request, and the Court will resolve any objections.

Hearing on Class Counsels motion for attorneys’ fees

September 19, 2024

A hearing on the motions has been set for September 19, 2024 at 1:30 PM (PT) in Courtroom 5, 17th Floor, 450 Golden Gate Avenue, San Francisco, California 9410, before the Honorable Edward M. Chen.

Do nothing

No Deadline

If you wish to remain in the class, you do not need to do anything at this time.


Dates and Deadlines

Objection Deadline

September 6, 2024

Hearing on Attorneys’ Fees and Final Judgment

September 19, 2024