Cummins Inc. announced updates to its Model Year 2027 North American on-highway product launch plans following its review of the U.S. Environmental Protection Agency’s (EPA) recently proposed changes to upcoming emissions regulations.

Based on the proposed rule, Cummins intends to use the implementation flexibilities outlined by the EPA to support a measured transition to its new HELM engine platforms.

According to Cummins officials, the approach is designed to maintain regulatory compliance, support customer production schedules, and provide additional time to ramp production in a disciplined manner that helps ensure a successful transition for the industry.

“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.”

Cummins officials plan to begin limited production of its 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 Q4 2027.

During the transition, Cummins said it expects its current-generation X15 engine to remain available, providing continued availability as production of the new platform increases.

Cummins added that it plans to begin limited production of the Model Year 2027 X10 in January 2027, with full production expected by Q3 2027, based on OEM launch plans.

During the transition, the current X12 and L9 engines used in truck and transit bus applications are expected to remain available.

The Model Year 2027 X10 and X15 are part of Cummins’ fuel-agnostic HELM platforms. The platforms are designed to deliver improved fuel economy and similar diesel exhaust fluid consumption.

Consistent with Cummins’ prior announcement, the company’s next-generation B platform is expected to launch in January 2028. The current B6.7 will remain available through 2027 to support customer production schedules and ensure a smooth transition to the new platform.

Cummins said it will continue working closely with OEMs, dealers, fleets, and other partners to align product availability and launch timing. The phased ramp is intended to support the transition to new technology better.

The updated product plan is based on the company’s preliminary assessment and the language currently included in EPA’s proposed rule.

Cummins said it will continue monitoring development of the final rule and “will carefully evaluate the rule to ensure it maintains the flexibilities the company is counting on.”

Officials said the company’s product plans and timing may be adjusted if the final rule differs materially from the current proposal, including potential changes to the proposed transition provisions.