A new lawsuit is casting a spotlight on one of General Motors’ smallest modern engines. Owners of vehicles powered by the company’s 1.2-liter turbocharged three-cylinder are accusing the automaker of selling vehicles with a potentially defective powertrain that can fail without warning. The case centers on a 2024 Chevrolet Trax that allegedly suffered catastrophic engine damage after relatively low mileage.
According to the complaint, the engine produced loud knocking noises before losing power and eventually failing completely. Plaintiffs claim the issue stems from internal component defects and argue that General Motors knew about the problem before selling vehicles equipped with the engine. The lawsuit seeks class-action status and could potentially involve multiple GM models that use the same compact turbocharged engine across the company’s lineup.
Lawsuit Filed After Trax Engine Failure
The legal action was filed by California plaintiffs Samantha and Donna Cook after their 2024 Chevrolet Trax reportedly experienced a sudden mechanical failure. According to the complaint, the vehicle displayed a “reduced engine power” warning while being driven before producing loud knocking sounds and stalling on the road. At the time of the incident, the SUV had just 11,581 miles on the odometer.
After the vehicle was taken to a dealership, technicians reportedly determined that a connecting rod had broken and damaged the engine block. The damage was severe enough that the engine required complete replacement. However, the plaintiffs claim replacement engines were backordered, leaving the vehicle undriveable while waiting for parts.
The complaint argues that this failure is not an isolated incident. The l 1.2-liter turbo engine can develop internal defects that lead to symptoms such as knocking sounds, sudden power loss, and major internal damage. In extreme cases, a broken connecting rod may pierce the engine block, potentially causing fluid leaks and increasing the risk of fire.
Multiple GM Models Could Be Affected
The 1.2-liter turbocharged three-cylinder engine is not limited to a single vehicle. According to reports about the lawsuit, the engine is used in several General Motors models including the Chevrolet Trax, Chevrolet Trailblazer, Buick Envista, and Buick Encore GX.
Because of this shared engine architecture, the lawsuit seeks to represent a broader group of owners whose vehicles use the same powertrain. If the court certifies the case as a class action, it could potentially involve thousands of drivers across the United States.
The complaint also alleges that General Motors became aware of potential defects through dealership repair data, warranty claims, and technical service bulletins issued to its dealer network. Plaintiffs argue these records indicate the company had prior knowledge of engine failures and related complaints before the lawsuit was filed. General Motors has not publicly admitted the engine is defective, and the claims remain allegations that will be tested in court.
What the Case Could Mean for GM
The lawsuit has been filed in the U.S. District Court for the District of Delaware and is seeking class-action status on behalf of affected vehicle owners. The case will first need to pass through early legal stages before moving into discovery, where both sides exchange internal documents, engineering data, and witness testimony.
During discovery, attorneys will attempt to determine whether General Motors knew about the alleged defect and whether the company took appropriate action once, the issue became known. These types of cases often hinge on internal communications and engineering reports that can reveal how manufacturers handled early warning signs of potential failures.
For now, the lawsuit represents an allegation rather than a confirmed defect. Vehicles equipped with the engine remain covered by the manufacturer’s warranty, which typically includes a five-year or 60,000-mile powertrain guarantee. Still, the case highlights the legal risks facing automakers as they increasingly rely on smaller turbocharged engines designed to deliver both performance and fuel efficiency in modern vehicles.