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General Motors is facing a proposed class action lawsuit over allegations that certain vehicles may suffer from a coolant leak caused by a defect in the engine cooling system. The complaint claims the problem can lead to overheating, reduced engine power and, in more serious cases, significant engine damage.
What is the problem?
The lawsuit concerns 2023-2026 Chevrolet Colorado and GMC Canyon models fitted with the L3B 2.7-liter turbocharged four-cylinder engine, as well as 2024-2026 Chevrolet Traverse and GMC Acadia vehicles and 2025-2026 Buick Enclave models equipped with the LK0 2.5-liter turbocharged four-cylinder engine.
According to the complaint, the alleged defect is located within the connection between the radiator hoses and the vehicle’s cooling system. Plaintiffs claim the quick-connect fittings can allow coolant to escape earlier than expected, potentially while the vehicle is still within its warranty period.
A loss of coolant can cause the engine to run hotter than it should, and the lawsuit alleges this may result in overheating, reduced engine performance or “limp mode”, sudden engine shutdown, and potentially severe engine damage. One plaintiff claims his 2024 Chevrolet Colorado developed a check engine warning and unusual grinding noise before he was left with an out-of-pocket repair bill of $489.36.
The complaint further alleges that GM knew about the alleged defect before selling or leasing the affected vehicles but did not adequately warn consumers or provide an effective remedy.
What owners should do
Owners of the affected Chevrolet, GMC, and Buick models should pay attention to coolant warnings, overheating, unusual engine noises, or changes in vehicle performance. Anyone experiencing these symptoms should arrange an inspection with an authorized dealer.
It is also worth keeping records of repair invoices, diagnostic work, and communications with GM, particularly if a coolant leak has already resulted in repair costs or repeated dealership visits.
How GM owners can take back control
A coolant leak may begin as a relatively minor problem, but if it is left unresolved, the consequences for an engine can become considerably more serious. Owners who have already paid for repairs or continue experiencing problems may want to look beyond another trip to the dealership.
If your GM vehicle has developed persistent cooling-system or engine problems, The Lemon Firm can help you understand whether those issues could give rise to a legal claim. Speak with one of our case analysts today to discuss what has happened with your vehicle and whether there may be a path towards recovering your losses or obtaining another remedy.