GM class action lawsuit overview:
- Who: A group of vehicle owners are suing General Motors.
- Why: The plaintiffs allege that GM knowingly sold vehicles with defective 10-speed transmissions.
- Where: The GM class action lawsuit was filed in California federal court.
A new class action lawsuit accuses General Motors of knowingly selling vehicles with defective 10-speed transmissions.
Plaintiffs Napa Valley G Experience LLC, Juan Morales and Ruben Smith filed the class action lawsuit against GM on April 13 in California federal court, alleging violations of state and federal consumer laws.
According to the lawsuit, GM sold vehicles with defective 10-speed transmissions that can cause violent or erratic shifting, delayed acceleration and even a complete loss of motive power.
The plaintiffs allege that GM knew about the defect but failed to disclose it to consumers.
The class action lawsuit claims that the defect affects a wide range of GM vehicles, including Chevrolet, GMC and Cadillac models.
GM issued technical service bulletins and recalls related to the defect, but these measures were too little, too late to remedy the fundamentally defective nature of the 10-speed transmission, the plaintiffs contend.
Lawsuit claims GM knew about transmission defect before vehicles hit market
The plaintiffs allege that GM knew about the defect before the vehicles were sold, as the transmission was co-developed with Ford, which faced similar issues with its 10-speed transmission in its F-150 trucks.
Despite this knowledge, GM continued to sell the vehicles without disclosing the defect, the plaintiffs say.
The class action lawsuit seeks to represent a class of all California residents who purchased or leased a GM vehicle with a 10-speed transmission.
The plaintiffs are seeking damages, including the cost of repairs, as well as injunctive relief to prevent GM from continuing to sell vehicles with the defective transmission.
In a separate class action lawsuit, consumers sued GM over allegations it sold vehicles with a defective brake vacuum pump system that can increase stopping distances and impair braking performance.
What do you think of the allegations made in this GM class action lawsuit? Join the discussion in the comments.
The plaintiffs are represented by Michael F. Ram and Colin Losey of Morgan & Morgan Complex Litigation Group and Will Ourand of Morgan & Morgan.
The GM class action lawsuit is Napa Valley G Experience LLC, et al. v. General Motors LLC, Case No. 3:26-cv-03148, in the U.S. District Court for the Northern District of California.
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43 thoughts onGM class action alleges defective 10-speed transmissions cause shifting issues, power loss
How do I get in on the lawsuit because I have a 2019 Chevy Camaro with a 10-speed transmission that went out in my eligible to join the class action lawsuit?
I just replaced the transmission in my 2018 Chevy Traverse at 75,000 miles. I had a recall that replaced the gear shifter box to address shifting issues and had service on “shift to park” warning twice. I feel like the service just covered the root of the problem-transmission failure.
I own a 2022 Chevy Traverse Premire AWD and a few weeks ago we were backing out of our driveway and I thought my ife had hit the curb. The transmission shifted gears so violenyly that it moved us both forward. It did the same thing the following day.
Please add me
Have a 2023 GMC Acadia SUV ; don’t know if 10 speed or not but it’s down shifting hard when brakes are being pushed at stopping and you hot gas, it is choking
I owned a 2014 GMC Acadia and complained about transmission issues almost from the first scheduled service. The hard shifting while driving was obvious, but every time I brought it in I was told “nothing is wrong.” Funny how the problem suddenly became a “you need a new transmission” diagnosis right after the warranty expired — leaving me with a repair bill costing thousands out of pocket, plus the inconvenience of dealing with a failing vehicle.
What’s frustrating is this shows the issue clearly isn’t new. Owners have apparently been reporting transmission problems for years, but now it’s finally getting public attention because it’s affecting newer 2025-26 models and leading to lawsuits. If GMC knowingly continued selling vehicles with known transmission defects, that’s a serious problem for consumers who trusted the brand.
Can we get this lawsuit to be nationwide as I have had to replace my engine and transmission in both my 2021 and 2025 GMC Sierra 1500 and still having issues?
Before everyone jumps on the ghetto lottery, more information needs to be furnished, such as what years and model GM vehicles are affected. Even if you are at class member, their is always some type of loophole that you can’t join the lawsuit or you’re never sent a post card with a verification number. Just a BS way of limiting liabilities and giving more money to the lawyers.
Have 2005 GMC Yukon Denali my transmission went out less than 3 months
It’s not a 10 speed.
We have a 2011 silverado 1500 that would go into limp mode. Be going speed limit and would just go down and very move.