GM 8-Speed Transmission Lawsuit Decertified By Appeals Court
GM Avoids Class Action Over 8-Speed Transmission Problems
The GM 8-speed transmission lawsuit just hit a major twist. The 6th U.S. Circuit Court of Appeals in Cincinnati voted on Friday to decertify the class action suit, thereby ending a significant legal threat to General Motors. The case centered on allegations that the company knowingly sold vehicles equipped with faulty 8L45E and 8L90 automatic transmissions.
Originally certified by U.S. District Judge David Lawson in Detroit, the class action covered roughly 514,000 vehicles and aimed to represent more than 800,000 GM owners in total. However, the company has now temporarily halted that effort.
Harsh Shifting Complaints Spark Legal Action
Plaintiffs claimed the eight-speed units caused erratic and unsafe driving behavior. According to the suit, the transmissions would lurch, hesitate, jerk, and shudder under normal driving conditions. Many of these issues reportedly persisted even after multiple dealer service attempts.
The case also involved drivers alleging that GM dealerships instructed customers to accept the harsh gear changes as “normal,” thereby exacerbating owner frustration.
Several key GM nameplates used the transmissions in question from 2015 through March 1, 2019. Models include the Chevy Corvette, Camaro, Silverado, GMC Sierra, Yukon, and multiple Cadillac CTS and ATS models. These 8-speed units—particularly the 8L90—have drawn consistent complaints from owners since their launch.
GM Argued Most Owners Never Had Issues
GM opposed the lawsuit from the start, claiming most drivers in the certified classes never experienced problems. That argument resonated with the appeals court. In the ruling, the court determined that the wide range of experiences and outcomes made a class action unworkable.
The company also pointed out that not every vehicle was affected in the same way, which undermined the idea of handling all claims as a single legal group. GM’s strategy relied on dissecting the class and showing that individual vehicle use, service history, and outcomes varied too much for collective legal treatment.
Appeals Court Sides With GM, Splits Politically
The vote to decertify the GM 8-speed transmission lawsuit fell along clear ideological lines. All nine judges in the majority were appointed by Republican presidents. The seven dissenting judges—led by Circuit Judge Karen Nelson Moore—were appointed by Democrats.
Judge Moore had previously ruled in favor of certifying the class in 2024. In her dissent, she accused the court of creating “insurmountable barriers” for consumers trying to bring class-action complaints against large automakers. Her concern: that the ruling could set a precedent making it harder for future consumer lawsuits to get certified.
Smaller Subclasses Could Still Be Certified
While GM successfully avoided a large-scale class action, this is not a complete win. The case now returns to Judge Lawson, who could choose to certify smaller subclasses based on vehicle model or transmission type. If that happens, GM could still face narrower, more targeted legal actions.
Owners of affected vehicles will likely be watching closely. This ruling may slow momentum, but the underlying transmission complaints are not going away. GM’s eight-speed automatic design may have sidestepped one legal minefield, but others may still lie ahead.
