Jonathan Dixon purchased a 2024 Chevrolet Colorado in March 2024. By February 2026, the truck’s check engine light illuminated, metal scraped at low speeds, and a $489.36 repair bill arrived—one his warranty didn’t cover. He now leads a federal class action lawsuit against General Motors, accusing the company of knowing about a coolant leak defect but failing to alert buyers.
The plastic clip that could cost GM
The lawsuit, filed June 26 in the U.S. District Court for the Northern District of Georgia, focuses on a quick-connect fitting on the upper radiator hose. The plastic seal, intended to simplify assembly, allegedly degrades too soon, letting coolant escape from a system that should remain pressurized. When leaks occur, engines overheat, lose power, and in severe cases, suffer major damage.
The problem affects multiple models and engine types. Vehicles involved include the 2023–2026 Chevrolet Colorado and GMC Canyon with the L3B 2.7-liter turbocharged engine, along with the 2024–2026 Chevrolet Traverse, 2024–2026 GMC Acadia, and 2025–2026 Buick Enclave with the LK0 2.5-liter turbocharged engine. The same fitting appears in all of them, indicating the issue stems from design rather than a single production error.
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Internal documents may weaken GM’s position. In March 2026, the company released Technical Service Bulletin PIT6494A, directing dealers to fix the exact seal failure Dixon encountered. The bulletin referenced diagnostic trouble code P3075—the same one his dealer identified. A solution existed, but some owners faced weeks-long waits for parts after the bulletin created a backorder.
Not all customers received equal treatment. GM sent letters to Traverse and Acadia owners under Special Coverage Program N262546590, extending warranty protection for the lower radiator hose seal to five years or 60,000 miles. The program also offered reimbursement for repairs paid out of pocket. Colorado and Canyon owners, however, got no such notice. Instead, they received a service bulletin that dealers might overlook.
The lawsuit argues this difference leaves truck owners at a disadvantage compared to crossover owners, despite the same defect. It claims GM sold the vehicles while aware of the issue but without informing buyers. The case aims to bridge the gap between an internal document most customers never see and a warranty extension that actually helps them.
Quick-connect hose fittings have gained popularity in modern vehicles. They install faster than traditional clamps and, in theory, improve reliability. The drawback is that the seal handles all the pressure—no backup exists. When it fails, coolant doesn’t always drip under the car. It might fail on a highway during rush hour, stranding drivers with overheating engines and unexpected repair costs.
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The lawsuit remains in its early stages. GM has until August 27, 2026, to respond to the complaint, a standard timeline for cases of this size. The company has retained legal counsel, while Dixon is represented by Beasley Allen, a firm experienced in automotive consumer cases. The case is filed as 2:26-cv-00217-SCJ in the Northern District of Georgia.
GM hasn’t commented publicly on the lawsuit. Its next steps—whether to seek a settlement, request dismissal, or move to discovery—are unclear.
For drivers facing similar issues, understanding legal options in court may help handle the process.
