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Proposed EPA Change Keeps NoX Limits, Alters Warranty and Deratement Rules for Trucks

The EPA released a proposed rulemaking that keeps the nitrogen oxide (NoX) emission limits from the 2023 Final Rule but makes key revisions: reducing warranty mileage from 450,000 to 100,000 miles (delayed to model year 2030), eliminating engine deratements in favor of visual/audible warnings, extending useful life provisions to 2030, and establishing noncompliance penalties. The agency says the changes retain 90% of the original NoX reductions and will not increase truck manufacturing costs.