United StatesCertain 2022–2027 TerraPro trucks (775 potentially affected; VINs searchable on NHTSA.gov from March 18, 2026) are included in this recall. Mack is recalling them because ECU software may allow the engine to start when the transmission is not in Neutral, which can cause unexpected vehicle movement; dealers will update the ECU software free of charge, owner letters were mailed April 14, 2026, and owners may call Mack at 1-800-866-1177 (Mack recall SC0492).
What's being recalled
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."
How to identify it
NHTSA campaign 26V139000; Manufacturer campaign SC0492
The hazard
Starting the vehicle while in gear may cause unexpected vehicle movement, increasing the risk of a crash or injury.
What to do
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.
The official notice
This page is a summary of the notice published by U.S. National Highway Traffic Safety Administration, collected from U.S. National Highway Traffic Safety Administration. Check the original before you act on it.
Read the official notice (opens in a new tab)