Seventeen miles were on John Williams’s new Chevrolet Equinox when he bought it for $36,587.12 in October 2024. By about 7,000 miles, he says, the vehicle was shifting roughly, responding late and hesitating under acceleration.

At approximately 14,000 miles, Williams brought the Equinox to an authorized GM dealership. The dealership diagnosed defective front axles, replaced them and said the transmission fluid had been topped off, according to the complaint. The lawsuit characterizes that work as an inadequate response to a transmission problem and says the symptoms persist.

That experience anchors a proposed nationwide class action against General Motors. Williams alleges that certain continuously variable transmissions, or CVTs, can slip, shudder, delay acceleration, lose forward gear or stop transmitting power while a vehicle is moving. He further alleges that GM knew about recurring problems but failed to warn buyers or provide a durable repair.

The proposed class spans four GM nameplates

The complaint seeks to represent people in the United States who bought or leased the following vehicles with the identified CVT systems. Whether the models actually share a legally significant common defect is a central allegation, not an established fact.

• Chevrolet Malibu: model years 2019 to 2025
• Chevrolet Trailblazer: model years 2021 to 2025
• Chevrolet Equinox: model year 2024 to present
• GMC Terrain: model year 2024 to present

The pleading associates those vehicles with VT40, also identified by production code RPO MRG, and TR690 transmission families. It alleges they share relevant valve-body, chain, pulley, bearing and case architecture. That proposed link across two transmission families will require evidence beyond the allegations in the complaint.

How a sticking valve could become a loss of motion

A conventional automatic transmission moves between fixed gear ratios. A CVT instead varies the effective diameter of pulleys connected by a belt or chain. The system depends on carefully controlled hydraulic pressure. According to the complaint’s account of GM Service Bulletin 24-NA-009, a clutch regulator valve can stick inside the valve body, disrupting engagement and potentially damaging other components.

Conceptual pathway based on the complaint’s description of GM guidance for VT40-equipped vehicles. It is not a measured failure-rate model and does not establish that every reported event had the same cause.

The strongest documentary evidence is GM’s service guidance

The complaint’s most concrete evidence does not come from speculation about internal meetings. It comes from three manufacturer communications that allegedly told technicians how to diagnose transmission symptoms.

Hundreds of complaints, but no agency finding

The lawsuit says a query of NHTSA’s Office of Defects Investigation database identified 358 CVT- or powertrain-related complaints among 1,494 total complaints for the four principal models. That works out to about 24 percent of the complaints counted by the plaintiff.

Source: figures stated in the class action complaint. The categories were selected by the plaintiff, the model totals differ substantially, and the complaints have not been shown here to share a single mechanical cause. NHTSA complaint data records consumer reports and does not itself verify a defect.

For drivers, the alleged failure can arrive at the worst moment

The complaint reproduces owner accounts describing vehicles that would not accelerate into traffic, lost power at highway speed or failed to engage a gear. Other owners reported that dealerships could not reproduce intermittent behavior, especially when no warning light or diagnostic code remained.

Another report involving a 2020 Malibu described a transmission malfunction while the driver attempted to enter a high-speed expressway. The owner said the car could accelerate only slowly, then failed completely after leaving the expressway. The report states that the dealership diagnosed an internal CVT failure requiring replacement.

Those reports illustrate the alleged risk, but they do not establish causation. A power-loss complaint can involve multiple systems, and the supplied pleading does not include inspections or engineering analyses for each vehicle. The class action excludes people asserting personal injuries from the alleged conduct.

The warranty dispute is about more than when a part failed

GM’s warranty, as quoted in the complaint, says the company will repair or replace parts defective in material or workmanship under normal use. The lawsuit says the five-year, 60,000-mile limited powertrain warranty expressly covers the transmission.

Williams says he reported his symptoms while his Equinox remained within both the new-vehicle and powertrain warranty periods. The complaint alleges that other owners received denials, were told their vehicles were operating normally, or underwent repairs that did not correct the underlying condition. Some failures allegedly occurred after the warranty expired.

The plaintiff argues that GM cannot rely on time or mileage limits if it knew about an inherent problem and withheld that information. GM’s position on that argument is not included in the supplied record.

This is an accusation, not a verdict

The complaint asserts nine claims, including alleged violations of California consumer law, breach of express and implied warranties, negligence, unjust enrichment and fraudulent concealment. It also invokes the federal Magnuson-Moss Warranty Act.

Williams asks the court to certify a nationwide class and California subclasses. Requested relief includes repairs, warranty changes, reimbursement, damages, restitution and an order compelling a voluntary recall. These are requests. The court has not granted them, certified a class or ruled that a common CVT defect exists.

The supplied PDF contains no answer, denial or other responsive filing from GM. The company’s service communications, as the complaint describes them, amount to guidance for diagnosing particular conditions. Whether those conditions were adequately disclosed or repaired, and whether they support liability across every proposed class vehicle, remains unresolved.

The bulletin descriptions indicate that GM was aware of slipping, delayed engagement, damaged components and loss-of-motion complaints in specified vehicles. The harder legal question is whether those documented conditions trace back to the class-wide defect alleged by Williams, and whether GM’s communications with dealers satisfied its obligations to the people driving the cars.