Volvo and Mack Trucks roll out DEF inducement software updates to comply with EPA guidance
Volvo and Mack Trucks announced updates to Diesel Exhaust Fluid (DEF) inducement software in order to provide truckers with relief from sudden slowdowns and power loss.
On July 27, Volvo and Mack Trucks announced software updates to comply with EPA guidance issued in August 2025 meant to reduce downtime from DEF inducements. DEF inducements are caused by a fault such as low DEF levels or a Selective Catalytic Reduction (SCR) system issue.
Under the new EPA guidelines, the final inducement speed is increased from five m.p.h. to 25 m.p.h. and the repair window is increased from four hours up to 160 hours.
Volvo DEF Inducement Software Updates
Volvo said that all new trucks rolling off the assembly line now include updated DEF inducement software.
“Since May 2026, Volvo Trucks has been producing D13 VGT and D13 TC engines featuring the updated software in the all-new VNL and all-new VNR trucks. Additionally, this updated software has been available in the aftermarket and has already been remotely downloaded into a large population of the new Volvo truck models. Volvo Trucks will roll out remote software updates to Legacy Model Year 2024 and newer vehicles by the end of the summer. Volvo Trucks is also broadening availability of changes outlined in the EPA guidance document to include all post-2014 model year vehicles by the second quarter of 2027 and all eligible post-2010 model year vehicles by the end of 2027. Truck models that do not have remote software update capability will be offered the updated software at their local Volvo Trucks dealerships.“
“These updates are about giving our customers more flexibility and confidence when they are on the road,” said Peter Voorhoeve, president, Volvo Trucks North America. “By extending the repair window and increasing the final inducement speed, we are helping drivers keep their trucks on the road and safely reach a service location, reducing the risk of unexpected downtime and supporting the uptime and productivity our customers depend on every day.”
Mack Trucks DEF Inducement Software Updates
Mack Trucks said that the software update will be rolled out across the company’s entire vehicle portfolio going back to post-2010 models.
“Mack began incorporating the updated software in May 2026 on Mack Pioneer™ and all-new Mack Anthem® models equipped with the Mack® MP®13 engines and will have software updates available for all 2024 and newer vehicles by the end of the summer. Mack is also broadening availability of changes outlined in the Environmental Protection Agency’s (EPA) guidance document to include all post-2014 vehicles by the second quarter of 2027. By the end of 2027, owners of all eligible post-2010 vehicles that do not have remote software update capability will be able to receive the updated software through Mack dealers.“
“Providing customers with practical solutions that support both compliance and operational efficiency remains a priority for Mack,” said Jonathan Randall, president of Mack Trucks North America. “By introducing this capability on new vehicles and establishing a clear path for legacy vehicle updates, we are helping customers maintain productivity while meeting evolving regulatory requirements.”
PACCAR announced similar DEF inducement software updates for Kenworth and Peterbilt trucks in early July.
Daimler Truck North America LLC also announced DEF software updates to comply with the new EPA guidelines in June.