Daimler Updates Software on 330,000 Trucks to End 5 MPH DEF 'Limp Mode'

DTNA to Equip Vehicles with Updated DEF Inducement Software

Daimler Truck North America is equipping its Detroit engines with updated software reflecting the U.S. Environmental Protection Agency’s (EPA) revised guidance on diesel exhaust fluid (DEF) inducements.

Daimler updates software on 330,000 trucks to end 5 MPH DEF 'limp mode'

Daimler Truck North America LLC (DTNA) issued a software update for hundreds of thousands of in-service commercial trucks in order to comply with new federal guidelines regarding Diesel Exhaust Fluid (DEF) inducements. On June 18, 2026 DTNA announced that software updates were rolled out to approximately 330,000 in-service vehicles with DD15 engines (model years 2021-2025) and DD13 engines (model years 2022-2025) since February, with updates to …

DTNA Software Update Gives Truckers More Time Before DEF Derates Take...

The changes reflect EPA guidance aimed at reducing downtime caused by emissions-system faults while maintaining compliance requirements.