Mack Trucks and Volvo Trucks both announced Monday the rollout of updates to diesel exhaust fluid (DEF) inducement software in their portfolio of all post-2010 models to meet new Environmental Protection Agency (EPA) guidance.
The announcements from the Volvo Group brands follows similar announcements by Daimler Truck North America, Cummins and Paccar.
Under new EPA guidance, inducement speeds have been increased from 5 miles per hour to 25 miles per hour and increase the repair window from four hours up to 160 hours. Volvo and Mack say their software updates align with current EPA guidance related to selective catalytic reduction (SCR) systems and DEF-related inducement strategies.
The updated software is designed to provide customers with a practical and streamlined path to compliance while supporting reliable vehicle operation, the companies state.
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Mack updates began in spring
Mack reports it 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 states it also is broadening availability of changes outlined in the 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, the company says.
“Providing customers with practical solutions that support both compliance and operational efficiency remains a priority for Mack,” says 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.”
[RELATED: Not all stakeholders onboard with EPA’s DEF derate rules, warranty easement]
Volvo announces similar plans
At Volvo, all new trucks rolling off assembly lines now include updated DEF inducement software. In addition to new production vehicles, Volvo Trucks also is rolling out the updated software across in-service truck models, with availability continuing to expand throughout 2027. The updated software gives customers substantially more time to address DEF-related issues before the engine derates or the vehicle goes into reduced speed inducement, helping keep trucks moving and supporting the uptime customers depend on, the company says.
Additionally, 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. The company says 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.
Finally, Volvo Trucks also is 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,” says Peter Voorhoeve, president at 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.”
