The proposal focuses on several compliance requirements affecting model year 2027 and newer trucks but does not change the nitrogen oxide (NOx) emissions standards established under the original rule.

EPA Proposes Changes to Several Compliance Requirements

The EPA’s 2023 rule introduced new emissions requirements for model year 2027 heavy-duty trucks, including nitrogen oxide standards that are 80 percent stricter than previous federal limits.

As part of its latest proposal, the agency is recommending changes to several compliance provisions, including:

• Replacing mandatory engine derates with audible or visual warning systems when diesel exhaust fluid (DEF) issues are detected.
• Returning the emissions compliance period from 650,000 miles to 435,000 miles.
• Returning emissions-related warranty coverage from 10 years or 450,000 miles to five years or 100,000 miles.

The proposed revisions would leave the underlying NOx emissions standards unchanged.

Industry Response Has Been Mixed

Many trucking organizations welcomed the proposed changes to engine derates and compliance requirements. However, the Owner Operator Independent Drivers Association (OOIDA) expressed concern that the proposal does not address the emissions standards themselves.

OOIDA also criticized the proposal to shorten emissions-related warranty coverage, arguing that reduced warranty protection could leave owner-operators and small carriers responsible for costly repairs involving emissions systems.

“If EPA is unable to amend burdensome NOx emissions standards, we believe there are more productive solutions than drastically cutting extended warranty periods for small business truckers at the behest of engine manufacturers and large fleets,” said Jay Grimes, OOIDA’s director of federal affairs.

Grimes added that warranty coverage should continue protecting truck owners from repeated and expensive emissions system failures that drivers have reported under previous emissions regulations.

Public Comment Period Runs Through August 29

The EPA is accepting public comments on the proposal through Aug. 29, 2026.

Drivers and other stakeholders can submit comments through Regulations.gov using docket number EPA-HQ-OAR-2026-0728.

The agency will also hold two virtual public hearings:

• July 29 at 9 a.m. Eastern.
• July 30 at 10 a.m. Eastern.

Anyone wishing to testify must register in advance by emailing EPA-HD-MobileSource-Hearings@epa.gov. According to the EPA, registration forms for those planning to testify must be submitted by July 22.

The agency will review public comments before determining whether to finalize the proposed revisions.

The TDUSA editorial team creates practical, driver-focused content covering trucking news, industry updates, safety, regulations, and career information for professional truck drivers across the United States. Each article is built to reflect real-world experience, industry developments, and information drivers can use on and off the road.

Last Updated: July 21, 2026

Source: Land Line Media

The post EPA Seeks Public Input on Proposed Changes to 2027 Truck Emissions Rule appeared first on Truck Drivers USA.

Key Participants in the Clean Truck Partnership

The partnership includes industry giants such as Cummins Inc., Daimler Truck North America, and Ford Motor Co., among others. These companies have pledged to meet California’s stringent vehicle standards, which mandate the shift towards zero-emissions technology, irrespective of federal challenges.

CARB is committed to collaborating closely with manufacturers, offering ample lead time for compliance with emission standards and supporting ZEV infrastructure development. “This agreement makes it clear that we have shared goals to tackle pollution and climate change,” stated CARB Chair Liane Randolph.

Jed Mandel, President of the Truck and Engine Manufacturers Association, echoed this sentiment, saying, “Through this agreement, we have aligned on a single nationwide nitrogen oxide emissions standard.”

Agreement Highlights

1. Alignment with Federal Standards: CARB will mirror the EPA’s 2027 nitrogen oxide emissions regulations while modifying some 2024 NOx requirements.

1. Regulatory Stability: CARB will provide a minimum of four years lead time and three years of stability before new regulations are introduced.

1. Commitment by Manufacturers: Companies will adhere to California’s zero-emission regulations, regardless of challenges to state authority.

Progress Towards a Clean Future

California is set to implement a phased transition to 100% zero-emission technology for medium and heavy-duty vehicles by 2045. This initiative is supported by federal approval, making California the first state to enforce such stringent standards.

Industry Leaders Weigh In

• Cummins Inc. expresses dedication to a zero-emissions future, appreciating CARB’s flexibility and alignment with EPA standards. “These actions will enable Cummins to improve product availability for our customers, while delivering significant emissions reductions,” says Shelley A. Knust.

• Daimler Truck North America remains focused on carbon-neutral vehicles by 2039, with Sean Waters emphasizing the importance of collaboration.

• Ford Motor Co. highlights the need for program harmonization during this industry transition. Cynthia Williams notes, “This alignment… will help us get more clean trucks on the road across the country.”

• Navistar values the regulatory certainty provided by the agreement, stating it allows for preparation for an increase in zero-emissions technology.

• PACCAR Inc. supports the environmental goals of California and the nation, with John Rich acknowledging the agreement’s role in ensuring product supply.

• Volvo Group North America praises the partnership for fostering product availability in line with California’s climate goals. Dawn Fenton believes cooperative efforts will lead to a less disruptive transition to zero-emission vehicles.

This partnership signals a united front in the move towards a sustainable future, paving the way for cleaner air and a healthier planet.

Source: The Buzz EV News

The post California’s Initiative for Cleaner Trucks Gains Momentum with New Partnership appeared first on Truck Drivers USA.

In a recent media release, Mack Trucks announced, “A Mack Anthem 70-inch Stand Up Sleeper and a Mack Anthem 4×2 Day Cab will be spotlighted at Mack booth No. 13139. With its sleek aerodynamic design, the Mack Anthem was built for efficiency, comfort, and connectivity. The Anthem models in the booth are spec’d with the Mack MP 8 engine and Mack mDRIVE 12-speed automated manual transmission (AMT), boosting fuel efficiency and driver productivity.”

These trucks are equipped with Mack GuardDog Connect, a comprehensive telematics system designed to diagnose and manage potential issues, ensuring maximum uptime for customers. Additionally, the Anthem models feature the Mack ClearTech One emissions system, which guarantees near-zero emissions.

Specifications on Display at ATA MC&E, Booth No. 13139 include:

• Mack Anthem 70” Stand Up Sleeper Model
• Engine: Mack MP8-445C, offering 445 horsepower
• Transmission: Mack mDRIVE 12-speed overdrive AMT
• Front axle: Mack FXL12.5, 12,500 lb.
• Features include Air Ride suspension rated up to 40,000 lbs., Mack PowerLeash engine brake, Mack GuardDog Connect, and Mack ClearTech One.
• Mack Anthem 4×2 Day Cab
• Engine: Mack MP8-415SE, with 415 horsepower and 1,650 lb.-ft. torque
• Transmission: Mack mDRIVE 12-speed overdrive AMT
• Features include Mack Maxlite 20EZ Gen2 air suspension rated up to 20,000 lbs., Mack Powerleash engine brake, Mack GuardDog Connect, and Mack ClearTech One.

For more details on the Mack Anthem models and to experience them firsthand, visit booth No. 13139 at the ATA MC&E or contact your local Mack dealer. Additional information is available at https://www.macktrucks.com/.

Source: The Trucker

Image: Mack Trucks

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