Cummins Inc. has announced updates to its Model Year 2027 North American on-highway product launch plans, shifting to a phased production ramp for its new engine platforms. The decision follows the company's review of the U.S. Environmental Protection Agency’s (EPA) proposed changes to upcoming emissions regulations.
The engine manufacturer intends to utilize implementation flexibilities outlined by the EPA to support a measured transition to its new HELM engine platforms. This approach is designed to maintain regulatory compliance while supporting original equipment manufacturer (OEM) production schedules and providing time to ramp production in a disciplined manner.
“Our long-term product strategy has not changed,” said Jennifer Rumsey, chair and CEO of Cummins Inc. “This is about improving the transition, not changing the destination. A phased production ramp will allow us to support customers while building confidence in our new products through real-world operation and maintaining our focus on quality.”
X15 and X10 Transition Timelines
Cummins plans to begin limited production of the Model Year 2027 X15 engine in January 2027, based on individual OEM launch plans. Production will ramp progressively, with full production expected to begin in the fourth quarter of 2027. To ensure continued availability during the transition, the current-generation X15 engine will remain available as production of the new platform increases.
The Model Year 2027 X10 will also see limited production starting in January 2027. Full production for the X10 is expected by the third quarter of 2027. During this period, the current X12 and L9 engines used in truck and transit bus applications will remain available.
Both the X10 and X15 are part of Cummins' fuel-agnostic HELM platforms. These platforms are designed to provide improved fuel economy and similar diesel exhaust fluid (DEF) consumption while maintaining reliability for heavy-duty applications.
B Platform and Future Outlook
The company reaffirmed its launch plan for the next-generation B platform, which is expected to debut in January 2028. The current B6.7 engine will remain available through 2027 to support customer production schedules and ensure a smooth transition to the new platform.
Cummins stated that the updated product plan is based on a preliminary assessment of the language currently included in the EPA’s proposed rule. The company will continue to monitor the development of the final rule and may adjust product plans or timing if the final regulations differ materially from the current proposal.
The company will continue working with OEMs, dealers and fleets to align product availability and launch timing throughout the transition to the new technology.
