Gothenburg, Sweden- AB Volvo., is launching a new generation of its I-Roll technology, now enhanced with an automatic engine stop/start function – a world-first for heavy-duty trucks. By shutting the engine off at the right moments, the system helps reduce both fuel consumption and CO₂ emissions, further lowering operating costs for transport operators.
This innovation builds on Volvo’s proven track record in fuel efficiency. The Volvo FH Aero recently won the 2025 Green Truck Award, underlining how the new Aero cab introduced in 2024 – along with ongoing aerodynamic refinements – delivers real reductions in fuel use and emissions.
The latest feature is developed in-house by Volvo and combines the capabilities of the existing I-See and I-Roll systems. Using continuous road data and information about road curvature, the truck can anticipate upcoming downhill gradients. When a suitable descent is detected, the engine is temporarily switched off. During this coasting phase, the truck consumes no fuel and produces zero tailpipe CO₂ emissions.
Mr. Jan Hjelmgren, Head of Product Management at Volvo Trucks, said, Volvo’s engineers have created a new engine function that makes long-haul transport even more efficient. He emphasizes that improving combustion engine technology remains a key part of Volvo’s broader decarbonization agenda and its commitment to minimizing environmental impact.
The stop/start function is active at speeds above 60 km/h, provided that conditions such as terrain and ambient temperature are suitable. Under the right circumstances, the new I-Roll with engine stop/start can deliver up to an additional one percent reduction in fuel consumption and CO₂ emissions, on top of the savings already achieved by existing Volvo technologies. Taken together, these advances offer meaningful benefits for both the climate and fleet operating costs.
The feature will be available on the Volvo FH and FH Aero models equipped with the 13-liter diesel engine, with customer orders opening in November 2025.
Volvo Trucks’ broader decarbonization strategy encompasses three main technology paths: advanced combustion engines designed to run on renewable fuels, battery-electric trucks, and fuel-cell electric vehicles.
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