Cadillac Class Action Lawsuit: Transmissions, V8 Engines, and Lyriq EV

A Cadillac class action lawsuit is currently pending in several forms against General Motors, covering transmission shudder in 2015–2019 models, catastrophic engine failure in 2021–2024 Escalades, electrical failures that “brick” the Lyriq EV, valve lifter failures in V8 engines, defective paint, hackable key fobs, and unauthorized sharing of driving data. None have produced a global settlement, and the largest case suffered a major setback in mid-2025.

8-Speed Transmission Cases (Escalade, ATS, CTS, CT6)

The biggest litigation involves GM’s Hydra-Matic 8L90 and 8L45 eight-speed automatic transmissions. Owners say the transmissions shudder, jerk, hesitate, and shift harshly, and that internal friction generates metal shavings that damage hydraulic systems and gears, sometimes requiring full replacement.1ClassAction.org. GM 8-Speed Transmission Defect Lawsuits

The Cadillac models named in the suits are:

Plaintiffs allege GM knew about the problem for years, issued at least thirteen technical service bulletins that did not fix it, and instructed dealers to tell customers the behavior was “normal.”3Cohen Milstein. General Motors Litigation4Quinn Emanuel. Quinn Emanuel Obtains Landmark En Banc Opinion The claims include breach of express and implied warranty, deceptive business practices, and fraudulent omission.

The lead case is Speerly et al. v. General Motors LLC, filed in August 2019 in the Eastern District of Michigan (Case No. 19-cv-11044).5Keller Rohrback. Faulty GM Transmission Litigation In March 2023 the district court certified 26 statewide subclasses covering roughly 800,000 owners.3Cohen Milstein. General Motors Litigation

On June 27, 2025, the Sixth Circuit issued a 9–7 en banc decision vacating that certification. Chief Judge Sutton wrote that the district court had not performed the rigorous analysis required by Rule 23, that “defect” carries different meanings across the 59 state-law claims involved, and that individual questions predominated over common ones.6U.S. Court of Appeals for the Sixth Circuit. Speerly v. General Motors LLC, No. 23-1940

What this means for Cadillac owners: the case is back before Judge David Lawson in Detroit. The named plaintiffs can still pursue individual claims, and lawyers can try to recertify a class under the stricter standard, possibly through smaller state-by-state subclasses. Until that happens, roughly 800,000 absent owners are no longer parties to the case.7Pickup Truck Talk. GM Wins Appeal on 8-Speed Transmission Class Action Lawsuit

6.2L V8 Engine Failure and Recall (2021–2024 Escalade)

In April 2025, GM recalled about 598,000 U.S. vehicles with the L87 6.2-liter V8, including the 2021–2024 Cadillac Escalade and Escalade ESV. NHTSA identified manufacturing defects in connecting rod and crankshaft components, including sediment in oil galleries and out-of-specification dimensions, that can cause catastrophic engine failure while driving.8NHTSA. Recall Report RCRIT-25V274-63439WHNT. NHTSA: GM Recalls Over 590,000 Vehicles for Possible Engine Failure

The recall remedy is an inspection. Engines that pass are switched from 0W-20 to thicker 0W-40 oil with updated components; engines that fail are quarantined pending further instructions.10NHTSA. Recall Report

Owners say that fix isn’t enough. Rittereiser et al. v. General Motors, LLC (Case No. 4:25-cv-11481) was filed May 19, 2025, in the Eastern District of Michigan, and a consolidated class action complaint followed in February 2026.11Hagens Berman. GM L87 Motor Engine Failure Defect The plaintiffs allege the oil-change remedy does not repair the underlying bearing issue and that affected vehicles have lost resale value. GM says the manufacturing faults were corrected for 2025 model-year engines.12Car and Driver. Chevy Tahoe, Silverado, Cadillac Escalade Defective V8 Class Action Lawsuit

Cadillac Lyriq EV “Bricking” Lawsuit

A class action filed April 2, 2026, in the Western District of Washington (Case No. 3:26-cv-05329) alleges the Cadillac Lyriq’s electrical architecture, software, battery management modules, and vehicle control networks can leave the car completely inoperable. Owners describe their vehicles as “bricked,” unable to start, charge, or move.13Top Class Actions. Consumers Sue GM in Class Action Over Cadillac Lyriq EV Defects

According to the complaint, a communication failure in the battery control module can cause the vehicle to flag its own battery as unsafe, shutting down charging and propulsion. The failures have been hard for dealership technicians to diagnose, leaving some owners without their cars for weeks or months.14ClassAction.org. Class Action Lawsuit Alleges Cadillac Lyriq Electrical System Defect Can Leave Vehicles Completely Inoperable

The suit alleges GM knew about the problems through pre-release testing, internal engineering reports, warranty claims, and NHTSA complaints but marketed the Lyriq as reliable anyway.15Michigan Public. General Motors Sued Over Alleged Cadillac Lyriq Defects The complaint says GM has offered to repurchase some vehicles but has delayed completing those buybacks.16Lemon Law Help. Cadillac Lyriq Bricked Lawsuit Claims are brought under the Washington Product Liability Act, the Washington Consumer Protection Act, and the Florida Unfair and Deceptive Trade Practices Act. GM has not publicly commented.

V8 Valve Lifter Failures (2014+ Escalade, 2016–2019 CTS-V)

Harrison et al. v. General Motors LLC (Case No. 2:21-cv-12927, Eastern District of Michigan), filed December 2021, targets premature failure of valve lifters, rocker arms, and valve springs in 5.3L, 6.0L, and 6.2L V8s with Active Fuel Management or Dynamic Fuel Management. The affected Cadillac models are the Escalade (2014 and newer) and the CTS-V (2016–2019).17GM Authority. GM V8 Engine Lifters Lawsuit Aims for Class Action Status

Owners report shuddering, stalling, power loss, and ticking noises. The complaint alleges warranty repairs replace failed lifters with identically defective parts, producing repeat failures and out-of-pocket repair bills that can run into thousands of dollars, with some full engine replacements.18ClassAction.org. Harrison et al. v. General Motors LLC – Complaint

The case has moved slowly. Several plaintiffs have voluntarily dismissed their claims and some original counsel have withdrawn. A class certification motion originally set for December 2025 has been pushed into 2026. No federal recall has been issued for the lifter defect.19GM Authority. GM V8 Engine Lifters Lawsuit

Paint, Key Fobs, and Driving Data

Peeling paint. Lyman et al. v. General Motors LLC (Case No. 2:24-cv-05786, Central District of California), filed July 2024, alleges defective exterior paint that peels, flakes, or deteriorates prematurely on 2015–2020 Cadillac Escalade and Escalade ESV models. It remained active as of mid-2026.20ClassAction.org. 2015-2020 Chevy, GMC, Cadillac Trucks Plagued by Defective Paint

Hackable key fobs. Jeremy Burkett v. General Motors Company et al. (Case No. 4:25-cv-00584, Eastern District of Texas), filed June 2025, alleges that wireless key fobs on the Cadillac Escalade and Escalade ESV, along with other GM models dating back to 2010, are vulnerable to signal-cloning devices that let thieves unlock and start the vehicles. The suit also cites vulnerabilities in the OBD port that can be used to program new key fobs.21Car Complaints. GM Lawsuit: Keyless Entry Systems Key Fobs Hacked22GM Authority. GM Facing Lawsuit Over Easily Hackable Keyfobs

OnStar data sharing. A March 2024 class action alleges GM and its OnStar subsidiary shared drivers’ behavior data with LexisNexis without authorization, allegedly raising insurance rates for some owners. It covers multiple GM brands, including Cadillac.23ClassAction.org. General Motors LLC Lawsuits

What Cadillac Owners Can Do Now

No global settlement has been reached in any of these cases, and there is no claim form to fill out for the transmission, engine, Lyriq, or lifter litigation. If you own an affected Cadillac, check your VIN on NHTSA’s recall lookup to see whether your vehicle is included in the April 2025 L87 engine recall or any other open recall, and keep records of repair orders, technical service bulletin work, and any correspondence with GM or your dealer. Those documents are what will matter if a class is recertified in Speerly, if the Harrison lifter case reaches certification, or if the Lyriq or Rittereiser cases produce individual notice to owners.