GM class action alleges vehicles with Hydra-Matic 8L90 transmission have defects

GM class action overview: 

• Who: Thirteen consumers filed a class action lawsuit against General Motors (GM). 
• Why: The class action lawsuit claims vehicles with a GM Hydra-Matic 8L90 or Hydra-Matic 8L45 transmission have transmission fluid and transmission issues that cause the vehicles to shudder, lurch forward or delay acceleration.
• Where: The GM transmission class action was filed in federal court in Michigan.

A group of 13 consumers claims certain transmissions in General Motors vehicles from the last decade are defective and can create unsafe driving conditions, according to a new GM transmission class action.

The plaintiffs say GM’s Hydra-Matic 8L90 and Hydra-Matic 8L45 transmissions manufactured between 2014 and March 2019 can cause vehicles to shudder, lurch forward or have delayed acceleration.

They allege the issues are caused by transmission fluid issues, which can allegedly cause the GM transmissions to fail to purge air properly from valve bodies. This, the class action argues, is the cause of the shudder, lurching and delayed acceleration, as well as overall poor shift quality.

GM class action: Automaker elected not to recall, replace defective transmissions 

The GM transmission issues happen around the time the affected vehicles’ warranties run out, the class action claims. The plaintiffs allege that GM covers fluid flushes for customers who complain about their transmissions during the warranty period, without fixing the underlying issues.

GM engineers asked the company to fix the transmission issues for $305 a vehicle, which would have cost GM about $592 million, according to the lawsuit.

GM instead only replaced the defective transmission in 6,518 unsold Cadillacs and trucks in certain states where it expected customers to complain within warranty, the GM class action claims.

Six drivers filed a 2022 class action lawsuit alleging that several vehicles manufactured by GM are equipped with defective eight-speed transmissions and that GM concealed the defects from buyers for years.

Do you own a vehicle with a GM Hydra-Matic 8L90 engine? Let us know in the comments.

The plaintiffs are represented by Theodore J. Leopold, Douglas J. McNamara, Karina G. Puttieva and Madelyn N. Petersen of Cohen Milstein Sellers & Toll PLLC along with Robert Gordon, Steven Calamusa, Geoff Stahl and Rachel Bentley of Gordon & Partners PA; Russell D. Paul and Amey J. Park of Berger Montague PC; Tarek H. Zohdy, Cody R. Padgett and Laura E. Goolsby of Capstone Law APC; E. Powell Miller, Sharon S. Almonrode, Brian M. Saxe, Emily E. Hughes and Dennis A. Lienhardt of The Miller Law Firm PC; Joseph H. Meltzer, Melissa L. Yeates, Lisa M. Port, Tyler S. Graden, Jordan E. Jacobson and James A. Maro of Kessler Topaz Meltzer & Check LLP; Lynn Lincoln Sarko, Gretchen Freeman Cappio and Ryan McDevitt of Keller Rohrback LLP; and Michael L. Pitt and Beth Rivers of Pitt McGehee Palmer Rivers PC.

The GM class action lawsuit is Ulrich, et al. v. General Motors LLC, Case No. 2:24-cv-11007-JJCG-EAS, in the U.S. District Court for the Eastern District of Michigan Southern Division.

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