What's Happening?
Paccar is set to update the engine software on its MX-11 and MX-13 powertrains used in Peterbilt and Kenworth trucks. This update follows revised guidance from the U.S. Environmental Protection Agency (EPA) regarding diesel exhaust fluid (DEF) inducements.
The changes will increase the final inducement speed limit from 5 mph to 25 mph and extend the component fault window from four to 160 hours. DEF inducements are mechanisms that restrict speed and power when a vehicle's emissions system detects a fault, such as low DEF levels or degraded selective catalytic reduction system performance. These inducements are designed to prompt drivers to address emissions issues promptly. Trucks manufactured after July 20, 2026, will receive the updated software at the factory, while those built after 2018 can obtain it at Peterbilt and Kenworth dealerships.
Why It's Important?
The update is significant as it reflects the EPA's revised guidance rather than a change in emissions standards. By extending the fault window and increasing the speed limit, fleets gain more flexibility in managing servicing without the operational impact of a severely speed-restricted vehicle. This change could potentially reduce downtime and improve operational efficiency for trucking companies. It also underscores the importance of maintaining compliance with EPA regulations while balancing operational needs. The trucking industry, which is a critical component of the U.S. economy, stands to benefit from these adjustments as they allow for more efficient fleet management and reduced service disruptions.
What's Next?
Trucks built after the specified date will automatically receive the updated software, while older models will need to visit dealerships for the update. This may lead to increased dealership visits in the short term as fleets seek to update their vehicles. The industry may also see further guidance or updates from the EPA as emissions technology and regulations continue to evolve. Trucking companies will need to stay informed about regulatory changes to ensure compliance and optimize their operations.
