Contact Congress about S. 3135: Cold Weather Diesel Reliability Act of 2025

The bill tells EPA to rewrite certain diesel rules within 180 days. It allows limited cold-weather suspension of some shutdown features and gives year-round DEF-related exemptions in certain northern or prolonged-freeze conditions. Other emissions standards stay in place.

Modern Action explains legislation in plain English, helps you choose whether to support, oppose, or ask for changes, and drafts a message tied to the bill, your stance, and the elected officials who can act on it.

Cold Weather Diesel Reliability Act of 2025 is a Senate bill in committee. The latest recorded action: Committee on Environment and Public Works. Hearings held.

Latest action on S. 3135: Committee on Environment and Public Works. Hearings held.

Who this affects: This bill mainly affects people and organizations that build, use, regulate, or depend on diesel vehicles and equipment in very cold places. Its biggest effects fall on manufacturers, fleets, workers, and communities in remote or northern regions where an automatic power cut or shutdown could create safety or reliability problems.

Why this matters: In very cold places, diesel emissions-control systems can create practical problems if they trigger automatic engine power reduction or shutdown when a vehicle or machine is still urgently needed. This bill matters because it tries to balance emissions enforcement with safety, equipment reliability, and continued transportation in remote areas. It could reduce the risk of vehicles or machinery losing power in dangerous conditions, but it could also increase diesel emissions in the affected situations, and the bill does not quantify that environmental effect.

Key provisions in S. 3135

• The bill requires EPA to rewrite Clean Air Act rules for highway diesel vehicles and nonroad diesel equipment within 180 days after it becomes law.
• It allows manufacturers to suspend emissions-related engine power reduction or shutdown features when emissions-control faults happen and the outside temperature is 0°C or lower.
• That suspension is allowed only when full engine performance in below-freezing weather is needed to prevent worker danger, equipment failure, or the loss of essential transportation in remote areas with limited roadside or emergency help.
• Engines must automatically go back to normal emissions-control operation, including inducement enforcement, once the temperature rises above 0°C.
• Only covered manufacturers may suspend these inducement-related power-reduction or shutdown functions, and no one else may do so.

How Modern Action helps you take action on S. 3135

You do not have to start with a blank letter. Modern Action turns the bill, your position, and the relevant congressional context into a message you can edit and send. The goal is to make contacting Congress clear, specific, and useful without forcing you to parse bill text or figure out the right office on your own.

Questions people ask about S. 3135

What is S. 3135?

The bill tells EPA to rewrite certain diesel rules within 180 days. It allows limited cold-weather suspension of some shutdown features and gives year-round DEF-related exemptions in certain northern or prolonged-freeze conditions. Other emissions standards stay in place.

How do I support or oppose S. 3135?

Choose support, oppose, or ask for changes on Modern Action. The action flow drafts the message for you and keeps the wording tied to this bill.

Who should I contact about S. 3135?

Modern Action uses your location to route the action to the congressional offices relevant to the bill and your representation.

Can Modern Action explain S. 3135 before I act?

Yes. Modern Action gives you a plain-English summary, current status, and action context before you send anything.