Freight News
7/9/2026
PACCAR raises DEF limp-mode speed from 5 to 25 MPH amid diesel emissions enforcement rollback
Original: PACCAR Is Raising the DEF Limp-Mode Speed From 5 MPH to 25 MPH. It Is Part of the Biggest Rollback of Diesel Emissions Enforcement in Years.
Short summary
PACCAR announced updated software raising the DEF limp-mode speed limit from 5 MPH to 25 MPH for trucks with diesel exhaust fluid system issues. This is part of a broader rollback of diesel emissions enforcement. The change provides relief for owner-operators previously stranded at dangerously low speeds on highways.
- •PACCAR raises DEF limp-mode speed from 5 to 25 MPH
- •Part of broader rollback of diesel emissions enforcement
- •Relief for owner-operators previously stranded at 5 MPH
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