Cummins Outlines Phased Launch Plan for Model Year 2027 Engines

Source: Cummins ↗

Fleets ordering medium- and heavy-duty trucks for model year 2027 are looking at a staggered Cummins engine supply curve, with the X15 entering limited production in January 2027 and the X10 following on the same schedule before either reaches full volume.

Cummins announced the phased rollout after reviewing the U.S. Environmental Protection Agency’s proposed changes to upcoming emissions regulations, and the company says it plans to use the implementation flexibilities the EPA outlined to manage the ramp. Full production of the X10 is expected by Q3 2027; full production of the X15 is not expected until Q4 2027, with both timelines contingent on individual OEM launch plans.

“Our long-term product strategy has not changed,” said Jennifer Rumsey, Chair and Chief Executive Officer 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.”

The X10 and X15 are part of Cummins’ HELM fuel-agnostic engine platforms. The platforms are designed to deliver improved fuel economy, similar diesel exhaust fluid consumption and field-tested reliability, according to Cummins.

During the X15 transition period, the current-generation X15 is expected to remain available as production of the new platform increases. During the X10 transition, the current X12 and L9, used in truck and transit bus applications, are expected to stay on offer.

Cummins’ next-generation B platform is expected to launch in January 2028, consistent with the company’s prior announcement. The current B6.7 will remain available through 2027 to support customer production schedules ahead of that changeover.

Cummins said the updated product plan rests on its preliminary assessment of language in the EPA’s proposed rule, and the company is continuing to monitor development of the final rule. If the final rule differs materially from the current proposal, including potential changes to the transition provisions, product plans and timing may be adjusted.

Cummins employs approximately 67,400 people worldwide and earned $2.8 billion on $33.7 billion in sales in 2025. Its five business segments include Engine, Components, Distribution, Power Systems and Accelera by Cummins.