Cold Weather Diesel Reliability Act of 2025

Key Points

• This bill would change how diesel engines work in very cold weather. It tells the EPA to let truck makers turn off features that normally slow down or stop an engine if the pollution control system has a problem.
• People driving trucks or using heavy machinery in freezing weather would benefit most. Right now, if the fluid used to clean exhaust freezes or the sensors fail in the cold, the engine might lose power or shut off completely, leaving drivers stranded.
• The goal is to keep people safe in remote areas. In extreme cold, having an engine shut down can be life-threatening if there is no cell service or help nearby. The bill argues that clean air rules should not put lives at risk.
• Engines would be allowed to run at full power whenever it is 32 degrees or colder. Once it warms up, the pollution controls would have to work normally again.
• Vehicles that mostly operate in the far north, like parts of Alaska, would get a permanent pass from using certain exhaust fluid systems. This is because the fluid often freezes and becomes impossible to use in those regions.

Impact Analysis

Govbase has not yet run an impact analysis on this legislation.