Mack Trucks, Inc.: Engine and Engine Cooling › Engine › Engine Control Module (ecu/Ecm) › Software
Mack Trucks, Inc. reported this defect to federal regulators on Mar 11, 2026 and put the number of vehicles at risk at 775. The repair is free for as long as the recall stands.
The defect
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."
The risk
Starting the vehicle while in gear may cause unexpected vehicle movement, increasing the risk of a crash or injury.
The 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.
6 model years covered
Newest first| Vehicle | Complaints | Recalls | Fires | Crashes |
|---|---|---|---|---|
| 2027 Mack Terrapro (te) | 0 | 1 | 0 | 0 |
| 2026 Mack Terrapro (te) | 0 | 1 | 0 | 0 |
| 2025 Mack Terrapro (te) | 0 | 4 | 0 | 0 |
| 2024 Mack Terrapro (te) | 0 | 7 | 0 | 0 |
| 2023 Mack Terrapro (te) | 0 | 4 | 0 | 0 |
| 2022 Mack Terrapro (te) | 0 | 5 | 0 | 0 |
What this page is, and what to do next
A recall is not an opinion. It is a Part 573 report a manufacturer is required by federal law to file once it decides a defect poses an unreasonable risk to safety, and it commits them to repairing the vehicle at no cost to the owner. The three passages above are the manufacturer’s own wording as published by NHTSA.
This page describes the campaign. It cannot tell you whether one particular car has already been through the shop — that is tracked by VIN, and only the manufacturer knows it. Check yours at nhtsa.gov/recalls or with a franchised dealer, quoting campaign number 26V139000.
Full record for the 2027 Mack Terrapro (te) → · Recalls carrying a do-not-drive advisory → · Where this data comes from →