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NHTSA Campaign 26V139000

ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE

Issued by Mack Trucks, Inc. · Reported Mar 11, 2026 · 775 vehicles affected

What's wrong

Mack Trucks, Inc. (Mack) is recalling certain 2022-2027 TerraPro trucks. The engine control unit (ECU) software may allow the engine to start when the transmission is not in Neutral. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 102, "Transmission Shift Lever Sequence, Starter Interlock, and Transmission Braking Effect."

Consequence

Starting the vehicle while in gear may cause unexpected vehicle movement, increasing the risk of a crash or injury.

Remedy

Dealers will update the ECU software, free of charge. Owner notification letters were mailed April 14, 2026. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0492. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov March 18, 2026.

Vehicles affected by this recall

Make Model Year Units
MACK TERRAPRO (TE) 2022 775
MACK TERRAPRO (TE) 2023 775
MACK TERRAPRO (TE) 2024 775
MACK TERRAPRO (TE) 2025 775
MACK TERRAPRO (TE) 2026 775
MACK TERRAPRO (TE) 2027 775

Source: NHTSA Campaign 26V139000 on nhtsa.gov. To check the current repair status for a specific vehicle, use our free VIN decoder.