1. Chevrolet Trailblazer and Trax  Engine Class Action 

A class action has been filed alleging multiple engine problems on the Chevrolet Trailblazer and Trax. See Cook vs. General Motors  Civil Act 6-cv-00229-UNA, United States District Court, District of Delaware.  Engines have failed requiring replacement and some owners report hearing a loud mechanical bang or knocking sound immediately before the vehicle decelerates and s, a connecting rod pierces the engine block, discharging oil and coolant.   

2. Cause of Engine Problems  

The complaint states Engine System Defect in all Class Vehicles is caused by improperly designed and/or manufactured internal components and lubrication pathways, including block porosity and oil-system faults. Manufacturer communications, TSBs, and field reports identify oil leakage from threaded fastener bores in the block, abnormal noise events treated as “normal,” and oil consumption and smoke associated with ventilation and cover assemblies; these conditions promote bearing distress, oil starvation, and connecting-rod failure.  Publicly available Technical Service Bulletins TSBs include 20-NA-084, 23-NA-122, 23-NA-141, and 24NA-021, which address conditions tied to premature engine failure.  TSB 24-NA-123 (September 18, 2024)  applicable to 2024 Buick Encore GX, 2024 Buick Envista, 2024 Chevrolet Trailblazer, and 2024 Chevrolet Trax discusses lubrication-related complaints and seepage on the 1.2-liter engine; emphasizes non-replacement remedies and directs sealant application or cover resealing rather than engine replacement. 

3. Forums 

According to the class action, the compEngine System in the Class Vehicles is a 1.2-liter turbocharged inline three cylinder gasoline engine (RPO LIH/LBP) that shares common casting, lubrication, and rotating assembly architecture across models. The design employs pressurized lubrication of crankshaft and connecting-rod bearings, oil-to-coolant heat exchange, and block castings with threaded fastener bores that, when porous, can permit oil or coolant migration. 45. In the Class Vehicles, this Engine architecture has manifested in abnormal knocking, rapid loss of power, and connecting-rod ejection through the engine block under ordinary driving, frequently accompanied by oil and coolant discharge and engine-compartment smoke or fire. Owner have reported sudden engine shutdowns, oil leakage, and internal damage consistent with bearing distress and block porosity, requiring engine replacement or extensive repair. Owners have further reported abrupt loss of propulsion, smoke, and fluid leakage consistent with connecting-rod failure and block breach, creating an acute safety hazard at highway speeds. Field reports describe a progression from knocking to immediate loss of power,

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