Allows diesel vehicle manufacturers to suspend engine derate or shutdown functions in cold weather conditions.
The Cold Weather Diesel Reliability Act of 2025 aims to ensure the reliability of diesel vehicles in cold weather regions by allowing manufacturers to temporarily suspend engine derate or shutdown functions triggered by emissions control system faults. This suspension is permitted when ambient temperatures are at or below zero degrees Centigrade, provided that normal emission control operation resumes once temperatures rise above zero degrees Centigrade.
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