Truck manufacturers and fleet operators are navigating a landscape of regulatory uncertainty as the industry prepares for the Environmental Protection Agency’s 2027 emissions standards.
During a round table discussion at the ACT Expo in Las Vegas Monday, executives from Cummins and International addressed the looming 35-milligram nitrogen oxide (NOx) standard, which is set to take effect for model year 2027. While the emissions targets appear firm, truck and engine manufacturers say critical details regarding warranty and useful life requirements remain in flux.
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A primary point of contention is the EPA’s mandate for extended warranty coverage and useful life limits that require that OEMs extend warranties to 450,000 miles from 100,000 and useful life to 650,000 miles from 435,000 miles.
Patrick Couch Senior Vice President, Technical, TRC Companies, Clean Transportation Solutions; Andrea Lukas, director of product management at Cummins; and David Hillman, vice president of integrated technology sales at International.
Andrea Lukas, director of product management at Cummins, noted that the industry is awaiting a Notice of Proposed Rulemaking (NPRM) expected in June. Industry insiders hope the federal government will revert to current warranty durations to alleviate significant cost pressures on fleets.
“It is very costly to increase emissions warranty and end-of-useful life,” Lukas said. “What could be changing is the cost specifically with regards to emissions warranty.”
[Related: Diesel's future bright amid stringent 2027 regulations]
Roughly half of the anticipated 2027 price increase is going to be in design and material cost said David Hillman, vice president of integrated technology sales at International, "and the other half, roughly, is warranty. The technology is not free and it’s not cheap."
DEF sensor confusion
The panel also addressed recent confusion regarding Diesel Exhaust Fluid (DEF) sensors. While EPA is moving away from requiring these sensors, the panelists clarified that the underlying requirement to monitor and reduce NOx remains.
Hillman compared the situation to playing hockey without ice skates. “You don't have to have ice skates, but to be effective on the rink, you need ice skates to play,” he said. “We aren’t mandated to have the [Quality Level] sensor, but the sensor is an integral part of delivering the quality level that is required.”
Lukas added that while manufacturers are allowed to explore other methods of detection, DEF sensors remain the most viable technology for 2027 compliance until alternatives are verified.
Fleet impact and pre-buying
The regulatory shift is already influencing market behavior. The manufacturers reported an increase in demand as fleets consider pre-buying 2026 models to avoid the higher costs and more complex after-treatment systems associated with the 2027 engines.
Hillman and Lukas warned that the second half of 2026 will be heavily constrained and considered it impractical for the industry to expand capacity enough to handle the peak demand of a pre-buy cycle. While there is high demand for 2026 models, some fleets face capital challenges due to the broader freight recession, which impacts their ability to pull orders forward as much as they might like.
