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Smell diesel? Check if your Kenworth or Peterbilt is under recall. Another recall involving Cummins engines has been issued. The latest includes tens of thousands of Paccar trucks. In September, Cummins issued an equipment recall related to L9 engines. Affected engines have a remote fuel filter hose that can separate from the fitting, potentially causing a fuel leak and an engine stall. Although more than 39,000 L9 engines are subject to the recall, the manufacturer estimates only 3% actually have a defective fuel filter hose. Soon after, Daimler Truck North America recalled a few thousand Freightliner trucks and chassis equipped with Cummins L9 engines. No warranty claims or injuries related to the defect have been reported. More than a dozen manufacturers purchased the Cummins L9 engines. Paccar is the latest to issue its related recall. According to National Highway Traffic Safety Administration documents, nearly 27,000 Paccar trucks are being recalled. Those include: * Kenworth T270 (model year 2022-23) * Kenworth T280 (2022-27) * Kenworth T370 (2022-23) * Kenworth T380 (2023-27) * Kenworth T480 (2023-27) * Peterbilt 548 (2022-27) * Peterbilt 536 (2023-27) * Peterbilt 537 (2023-27) * Peterbilt 567 (2025) Like the original Cummins recall, Paccar estimates only 3% of the total recall population is affected by the defect. Owners of affected trucks may smell diesel or notice the leak. A low fuel pressure warning may come on. Similar to the Daimler Truck recall, there have been no reports of warranty claims or injuries. Paccar will replace the fuel hoses at no cost. Notification letters are expected to be sent to truck owners on Dec. 20. Questions about this recall can be directed to Peterbilt's customer service at 940-591-4220 or Kenworth at 425-828-5888 with recall number 26PACJ. NHTSA's number for this recall is 26V700. Daimler Truck and Paccar's recalls account for about three-quarters of all Cummins L9 engines being recalled. The remaining manufacturers include buses, cranes, fire trucks, motorhomes and refuse and utility trucks. LL

Cummins announces S29 engine for mining applications. Oct 28, 2026 Columbus, Ind. Today, global power and technology leader Cummins Inc. (NYSE: CMI) unveiled the highly anticipated Cummins S29 mining engine at a celebratory launch event at the Chongqing Cummins Engine Plant in Chongqing, China. This announcement builds on the preview shared during Cummins 2026 Analyst Day in May. "Today, we're not just introducing a new engine - we're setting a new benchmark for mining power," said Jenny Bush, Cummins Vice President and President, Power Systems. "The Cummins S29 brings together innovations in fuel economy, reliability and power density to deliver exceptional performance, exceptional total cost of ownership and the flexibility to adapt as mining operations evolve." A clean-sheet, 29-liter engine platform, the S29 is designed for 90- to 120-ton haul trucks and 150- to 220-ton excavators, with additional applicability across a wider range of mining and industrial equipment, including surface miners, bulldozers, wheel loaders and dewatering pumps. The engine is planned to be available globally in regions that require China Stage III (EPA Tier 2 Equivalent), and non- certified emissions configurations, in late 2027. The S29 is designed to deliver competitive power density, with output of up to 1300hp at 2100rpm. This enables maximum vehicle integration flexibility, with the S29 delivering the power and performance of higher displacement engines within a compact installation package. Fuel efficiency was a key consideration in the S29's development. Based on current development targets, the S29 is expected to achieve best point BSFC of 180 g/kW.hr, representing industry-leading fuel economy for its power range and positively impacting the engine's operational costs. Another standout feature is the S29's fuel-agnostic capability, helping customers support evolving fuel strategies. At launch, the engine is planned to be compatible with diesel, unblended paraffinic fuels (EN15940) such as HVO and biodiesel blends up to B50. The platform is also being designed to support potential future natural gas, hydrogen or dual-fuel configurations. The S29 is also being developed for the extreme environments of high-altitude and remote mines with altitude capability of up to 3,000 m without derate and cold starts at temperatures as low as -25° C without auxiliary preheating. "Mining customers are under relentless pressure to move more material, lower operating costs and improve efficiency," said Gbile Adewunmi, Cummins Vice President - Industrial Markets, Power Systems. "We're excited to provide the next generation of mining power with the S29, a truly world-class platform purpose-built to help turn those pressures into more productive, profitable operations." Customers can see the S29 engine on display at bauma CHINA from November 23 - 27, 2026, in Shanghai, China, at Cummins booth Outdoor C.78. About Cummins Inc. Cummins Inc., a global power leader, is committed to powering a more prosperous world. Since 1919, Cummins Inc. has delivered innovative solutions that move people, goods and economies forward. Its five business segments - Engine, Components, Distribution, Power Systems and Accelera(TM) by Cummins - offer a broad portfolio, including advanced diesel, electric and hybrid powertrains; integrated power generation systems; critical components such as aftertreatment, turbochargers, fuel systems, controls, transmissions, axles and brakes; and zero-emissions technologies like battery and electric powertrain systems. With a global footprint, deep technical expertise and an extensive service network, Cummins Inc. deliver dependable, cutting-edge solutions tailored to its customers' needs, supporting them through the energy transition with its Destination Zero strategy. Cummins Inc. create value for customers, investors and employees and strengthen communities through its corporate responsibility global priorities: education, equity and environment. Headquartered in Columbus, Indiana, Cummins employs approximately 67,400 people worldwide and earned $2.8 billion on $33.7 billion in sales in 2025. Media Contact Cat Dillon Lyons External Communications Manager Related Topics Want to find out more? Receive the latest from Cummins in technologies, products, news, and insights.

Why aftertreatment systems can't always be one-size-fits-all. By Cummins Inc., Global Power Technology Leader Oct 21, 2026 In today's diverse medium-duty truck market, engine performance and emissions compliance are only part of the equation. Just as important is making sure emissions systems physically fit and function well within the wide range of truck designs used across the United States. From last-mile delivery vans and school buses to vocational work trucks and box trucks, medium-duty vehicles serve many different purposes. Each one comes with its own set of layout challenges, which means aftertreatment systems can't be one-size-fits-all. That is why Cummins developed the Flex Module, a next-generation aftertreatment solution that is built to adapt. Aftertreatment system considerations for medium-duty OEMs. For medium-duty original equipment manufacturers (OEMs), selecting an aftertreatment system involves more than just meeting EPA emissions standards. It must also work within the space and layout constraints of different vehicles. OEMs need a system that: * Meets upcoming EPA 2027 regulations * Fits seamlessly into a wide range of chassis designs * Offers flexibility for mounting locations * Provides durable, long-lasting performance * Keeps costs and service complexity low The challenge is balancing all of those needs at once, especially as emissions regulations become stricter and require larger catalyst volumes and more advanced thermal management systems. Introducing the Flex Module. The new Cummins Flex Module is designed to solve this challenge. It combines the best of proven aftertreatment technology with innovative new features to meet EPA 2027 emissions requirements, all while offering unmatched flexibility for installation. The Flex Module builds on the familiar single-module diesel particulate filter (DPF) assembly architecture, which has worked well for many years. However, it also introduces newer technologies like the Cummins Electric Heating System, which allows the aftertreatment catalyst to heat up quickly, especially during cold starts. By combining what already works with what is needed for the future, the Flex Module gives OEMs and fleets a solution that is both reliable and ready for the next phase of emissions regulations. Flexible assembly locations. One of the most important aspects of the Flex Module is its installation flexibility. Medium-duty trucks are sold into one of the widest varieties of applications in the commercial vehicle industry. From flatbeds and tow trucks to refrigerated delivery and utility vehicles, no two chassis are the same. That is why Cummins designed the Flex Module to be installed in multiple locations, including: * Passenger-side step box * Back of cab * In-rail * A combination of these positions This adaptability allows OEMs to place the aftertreatment system where it makes the most sense for weight distribution, body design and operational needs without compromising emissions performance. Types of configurations. The Flex Module also introduces an innovative packaging concept with separate, configurable DPF and selective catalytic reduction (SCR) assemblies. This design gives OEMs more freedom to configure each part of the system independently, depending on space and layout needs. Why is this important? * EPA 2027 regulations require larger catalyst volumes to further reduce nitrogen oxides (NOx) and particulate emissions. This typically means a larger overall system, which can be harder to fit. * By splitting the system into two assemblies, Cummins gives OEMs more flexibility in chassis integration, which helps avoid clearance issues and improve weight distribution. This modular approach is a key enabler for medium-duty OEMs looking to meet new emissions standards without re-engineering their entire vehicle layout. Impact of design change. While meeting emissions requirements is non-negotiable, how you meet them can make a big difference in cost, complexity and time to market. The Flex Module is designed with that in mind. Thanks to its flexible mounting points, modular connections and compact footprint, the Flex Module can be customized to a wide variety of vehicle designs. That means less redesign work for OEMs, shorter integration timelines and greater consistency across platforms. This flexibility also supports upfitting and aftermarket applications, helping fleets adopt cleaner technologies without major disruptions. Conclusion. As emissions regulations continue to tighten, OEMs and fleets need aftertreatment systems that do more than just comply. They need solutions that adapt to real-world vehicle layouts, support uptime and simplify integration. The Cummins Flex Module offers that and more. By blending proven emissions technology with next-generation flexibility, Cummins is helping the medium-duty industry meet EPA 2027 regulations without sacrificing what matters most: performance, uptime and installation ease. After all, in a market as varied as medium-duty trucking, "one-size-fits-all" has never really fit. The Flex Module finally delivers a solution that does. Cummins Inc., Global Power Technology Leader. Cummins Inc., a global power leader, is committed to powering a more prosperous world. Since 1919, Cummins Inc. has delivered innovative solutions that move people, goods and economies forward. Its five business segments - Engine, Components, Distribution, Power Systems and Accelera(TM) by Cummins - offer a broad portfolio, including advanced diesel, electric and hybrid powertrains; integrated power generation systems; critical components such as aftertreatment, turbochargers, fuel systems, controls, transmissions, axles and brakes; and zero-emissions technologies like battery and electric powertrain systems. With a global footprint, deep technical expertise and an extensive service network, Cummins Inc. deliver dependable, cutting-edge solutions tailored to its customers' needs, supporting them through the energy transition with its Destination Zero strategy. Cummins Inc. create value for customers, investors and employees and strengthen communities through its corporate responsibility global priorities: education, equity and environment. Headquartered in Columbus, Indiana, Cummins employs approximately 67,400 people worldwide and earned $2.8 billion on $33.7 billion in sales in 2025. Related Topics Want to find out more? Receive the latest from Cummins in technologies, products, news, and insights.