GM Class Action Summary
- Who filed it: Jonathan Dixon v. General Motors LLC, filed June 26, 2026, U.S. District Court for the Northern District of Georgia
- Case number: 2:26-cv-00217-RWS
- Who is affected: 2023-2026 Chevrolet Colorado and GMC Canyon (L3B 2.7L turbocharged engine), 2024-2026 Chevrolet Traverse and GMC Acadia, and 2025-2026 Buick Enclave (LK0 2.5L turbocharged engine) owners and lessees, nationwide
- What is the defect: A design or manufacturing defect in the radiator hose quick-connect fitting (the snap-together coupling that joins the radiator hose to the cooling system, rather than a threaded or clamped connection) allegedly allows coolant to leak out early in the vehicle’s life
- Litigation status: Newly filed complaint as of June 26, 2026. No class certification or settlement yet, and no claim deadline exists.
- Think you have this issue? Contact The Margarian Law Firm for a free case evaluation. California owners: your individual claim may be worth more than a class payout.
What does the lawsuit claim?
General Motors LLC is the defendant in a new class action lawsuit reported by Top Class Actions. Plaintiff Jonathan Dixon filed the complaint on June 26, 2026, in Georgia federal court, alleging violations of state and federal consumer protection and warranty laws.
According to the lawsuit, the affected vehicles use a closed, sealed engine cooling system, meaning coolant is meant to circulate continuously between the engine and radiator in a contained loop to regulate operating temperature and prevent overheating. Dixon claims the system suffers from a design or manufacturing defect in the radiator hose quick-connect interface, the snap-together fitting that joins the radiator hose to the rest of the cooling system, that causes coolant to leak from the connection point early within the warranty period and the vehicle’s useful life. Coolant loss can then lead to engine overheating, reduced engine power or “limp mode” (a safety mode that limits speed and power to protect the engine), sudden engine disablement, and in some cases catastrophic engine damage, according to the complaint.
Dixon says he purchased a new 2024 Chevrolet Colorado in March 2024, and that in February 2026 the vehicle’s check engine light illuminated along with a metal-on-metal grinding noise at slow speed. He claims he paid $489.36 out of pocket for repairs because GM’s warranty did not cover the defect. The lawsuit alleges GM knew about the defect before the first affected vehicle was ever sold, but did not warn consumers or offer an adequate remedy, which Dixon says makes GM’s marketing of these vehicles false and misleading.
Dixon is suing for alleged breach of warranty, concealment of a known product defect, and violations of federal warranty law and Georgia consumer protection statutes, and seeks class certification, damages, fees, costs and a jury trial, as alleged in the complaint.
Sources: Top Class Actions | U.S. District Court for the Northern District of Georgia
Who is covered by this lawsuit?
Dixon is seeking to represent a proposed class defined as owners and lessees of:
- 2023-2026 Chevrolet Colorado and GMC Canyon, equipped with the L3B 2.7L turbocharged four-cylinder engine
- 2024-2026 Chevrolet Traverse and GMC Acadia
- 2025-2026 Buick Enclave, equipped with the LK0 2.5L turbocharged four-cylinder engine
The number of vehicles or class members has not yet been confirmed.
What happens next in this case?
There is no class certification or settlement yet. Cases like this often take a year or more to reach that stage, if they get there at all. If you’re unfamiliar with how a case like this typically proceeds, how class action lawsuits work walks through each stage from filing to a possible settlement.
For questions about your legal rights and whether an individual claim may serve you better than this class action, contact The Margarian Law Firm.
Could your individual claim be worth more than this class action?
Class actions exist to give large groups of consumers a path to compensation when individual claims might otherwise be too small to litigate alone. That does not mean the eventual class payout, whenever it arrives, is the best outcome for every affected owner.
This case has not reached a settlement, and it may be a year or more before it does, if it gets there at all. If you have already experienced a coolant leak, overheating, reduced power or limp mode, or an engine problem in your Colorado, Canyon, Traverse, Acadia or Enclave, and paid out of pocket for repairs or been denied warranty coverage, you do not have to wait on this lawsuit to find out where you stand. A California lemon law claim moves on its own timeline and is based on your specific vehicle and repair history, not a class-wide average.
Reach out to The Margarian Law Firm to discuss your specific situation.
If you later receive a class notice about this case, you will generally have three options: stay in, opt out, or object, and the deadlines in that notice are firm. Joining or opting out of a class action explains what each choice means before you decide.
Does your situation qualify? A quick self-check
- Have you experienced a coolant leak, an antifreeze smell, overheating, reduced power or limp mode, or an unexplained engine issue with your Colorado, Canyon, Traverse, Acadia or Enclave?
- Have you taken your vehicle to the dealer for this issue without a lasting fix?
- Did you pay out of pocket for repairs, or was a warranty claim denied?
- Is your vehicle still within GM’s manufacturer warranty period?
- Are you a California resident, or did you purchase or lease the vehicle in California?
If you answered yes to any of the above, you may be entitled to compensation under California’s lemon law, potentially more than this class action would pay. Contact The Margarian Law Firm for a free case evaluation.
If your vehicle qualifies, California law requires the manufacturer to pay your attorney fees, meaning representation typically costs you nothing out of pocket.
What California’s lemon law actually covers
Frequently asked questions
1- Is my Chevrolet, GMC or Buick included in this class action?
The proposed class covers 2023-2026 Chevrolet Colorado and GMC Canyon with the L3B 2.7L turbocharged engine, 2024-2026 Chevrolet Traverse and GMC Acadia, and 2025-2026 Buick Enclave with the LK0 2.5L turbocharged engine. Whether you have a stronger option than waiting on the class action depends on your specific repair history.
2- What does this lawsuit allege exactly?
The complaint alleges a design or manufacturing defect in the radiator hose quick-connect fitting causes coolant to leak early in the vehicle’s life, which can lead to overheating, reduced power or limp mode, sudden engine disablement, and in some cases serious engine damage. GM allegedly knew about the issue before the first vehicle was sold and did not warn consumers.
3- Do I have to do anything to join the class action?
Generally, no. Most class actions are structured so that qualifying owners are automatically included unless they later opt out; the class action FAQ covers the general mechanics. For this case specifically, there is no notice or claim form yet, since no settlement has been reached.
4- Should I wait for the class action to resolve, or talk to an attorney now?
If you have already experienced the coolant leak issue and incurred costs, you do not need to wait. Reviewing your situation now costs nothing and does not affect your ability to also participate in the class action later if that turns out to be the better path.
5- Can I still file an individual lemon law claim if I am part of this class?
In many cases, yes, at least until a settlement is reached and you are asked to make a choice. An attorney can walk you through the timing and whether opting out to preserve an individual claim makes sense for your situation.
6- What is the difference between a class action payout and a lemon law claim?
A class settlement, if one is ever reached, is typically divided among a large group of class members, which can shrink an individual’s share considerably. A California lemon law claim is evaluated on your specific vehicle, repair history, and out-of-pocket costs, and can include a full refund or replacement plus attorney fees paid by the manufacturer.
7- When will this case be resolved?
There is no way to predict a timeline this early. The case is currently a newly filed complaint, meaning it has not yet reached class certification, let alone a settlement.
8- How much could a settlement pay me?
No settlement exists yet, so there is no payout figure to report. Class action settlements, if and when they happen, are typically divided among all class members, which can result in a modest individual share compared to a successful individual claim.
Standard Legal Disclaimer
The information in this post is for general informational purposes only and does not constitute legal advice. Past results do not guarantee future outcomes. Every case is evaluated on its individual merits, and outcomes vary based on the manufacturer, the defect, repair history, and other factors. Attorney fees in qualifying lemon law cases are paid separately by the manufacturer upon a successful outcome under California’s Song-Beverly Consumer Warranty Act (California’s core lemon law statute). Contacting The Margarian Law Firm does not create an attorney-client relationship.
Official sources and further reading
- Top Class Actions article
- Other outlets: CarComplaints.com (“GM Class Action Lawsuit Focuses on Radiator Hose Connector”), Autoblog (“A Tiny Hose Clamp Has GM Facing A Big Class-Action Lawsuit”)