World's first stop-start truck engine to cut fuel, CO2 emissions

Volvo Trucks has introduced the world’s first stop-start engine system for heavy-duty trucks, designed to reduce fuel consumption and CO2 emissions. This innovative technology builds on Volvo’s existing I-See and I-Roll systems, which use high-resolution maps and road topography data to optimize driving performance. The stop-start feature automatically turns off the engine when the truck approaches a downhill slope and restarts it smoothly without driver input, enhancing fuel efficiency during long-haul trips. The system activates at speeds above 37 mph and is integrated into the Volvo FH and FH Aero models with 13-litre diesel engines, available from September 2025. The I-See technology anticipates uphill grades by increasing speed beforehand and managing gear shifts to avoid fuel waste, while Eco-Roll disengages the driveline to let the truck coast optimally before re-engaging. It also applies engine braking gently at slope ends and uses traffic and road condition data to maximize kinetic energy use. This system is part of Volvo