EPA May Remove Limp Mode for Diesel Trucks with Low DEF

The United States Environmental Protection Agency (EPA) is considering significant changes regarding diesel trucks and their regulation related to Diesel Exhaust Fluid (DEF). Under the leadership of Administrator Lee Zeldin, the agency has shifted focus towards deregulation rather than strict enforcement of penalties for violations of the Clean Air Act.

Potential Removal of Limp Mode for Diesel Trucks

In a recent press release, the EPA announced that it is examining the potential removal of limp mode regulations for diesel trucks. Historically, trucks equipped with DEF systems would enter a “limp mode” when DEF levels are low, limiting speed and power. This change could allow vehicles to operate normally for a longer duration, even with low DEF levels.

Key Changes in Regulations

• The EPA is asking for data from the top 14 manufacturers regarding DEF systems.
• Information requested includes warranty claims and failure rates for model years 2016, 2019, and 2023.
• Manufacturers have a 30-day deadline to respond or risk additional penalties.
• Under the proposed changes, trucks could run 4,200 miles or 80 hours with low DEF without immediate restrictions.

Background on DEF System Failures

During his tenure, Zeldin has encountered numerous reports concerning DEF system failures from truck drivers across all 50 states. He acknowledged these issues, stating that a significant number of complaints relate to the reliability and performance impacts of DEF restrictions.

Future of Diesel Truck Performance

The EPA’s reevaluation of these regulations is pivotal. If the agency decides that limp mode is unnecessary for compliance, the change could greatly enhance the performance of new diesel pickups. Many drivers have expressed frustration with the current DEF-related limitations, indicating that if performance is no longer hindered, it may lead to reduced reliance on filling DEF tanks.

Overall, these considerations reflect a growing interest in enhancing diesel truck efficiency while balancing environmental concerns. The effects of these proposed changes remain to be seen as the EPA moves forward with its assessment.