GM May Face A Class-Action Lawsuit Over Defective 8-Speed Transmissions

The lawsuit affects Chevy, Cadillac and GMC cars and trucks

Chevrolet Corvette Z06 (C7)
The class-action lawsuit affects models like the Chevrolet Corvette.

Plaintiffs in the lawsuit allege General Motors’ 8-speed transmissions are defective.

Certain Chevrolet, Cadillac and GMC models built between 2015 and 2019 may have a defect in their 8-speed transmissions, according to a class-action lawsuit posted to GM Authority spotted the lawsuit, which says there are serious problems with GM’s Hydra-Matic 8L90 and 8L45 transmissions.

More specifically, the transmissions have a defect that cause vehicles to hesitate and jerk when accelerating or coming to a stop. The lawsuit reads, “These transmissions have a common defect…Drivers have reported that the shift is sometimes so violent, they feel as though they have been hit by another vehicle.” It also mentions the case of an owner whose vehicle shifted from reverse to drive harshly enough that it nearly lurched through his garage door. The defect centers around the transmission itself or the torque converter. Over time, any shuddering, jerking or hestitation may cause internal issues, including metal shavings being circulated throughout the transmission.

The class-action lawsuit further alleges the metal shavings end up causing costly damage over time, and can make GM cars and trucks with the transmission dangerous to drive. Since 2015, the filing states GM has issued thirteen Technical Service Bulletins (TSBs) on the issue. To date, none of GM’s solutions have remedied the problem.

The lawsuit affects Chevy, Cadillac, and GMC vehicles

The lawsuit includes all vehicles equipped with the Hydra-Matic 8L90 or 8L45 transmissions, including.

The plaintiffs are seeking six statewide classes on behalf of GM owners with these transmissions. Those states include California, Florida, Illinois, Oklahoma, New York and Texas.

At this point in time, General Motors has not commented on the lawsuit. We will provide more updates if and when we hear anything.

Have you had any issues with your 8-speed transmission? Let us know in the comments below.