Recall 26V139000: Mack Trucks, Inc., engine and engine cooling:engine:engine control module (ecu/ecm):software
Reported 2026-03-11 · vehicle recall · 775 units
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Problem
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."
Risk
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.
Affected vehicles
| Make | Model | Year |
|---|---|---|
| MACK | TERRAPRO (TE) | 2022 |
| MACK | TERRAPRO (TE) | 2023 |
| MACK | TERRAPRO (TE) | 2024 |
| MACK | TERRAPRO (TE) | 2025 |
| MACK | TERRAPRO (TE) | 2026 |
| MACK | TERRAPRO (TE) | 2027 |
| Manufacturer campaign | SC0492 |
|---|---|
| Initiated by | MFR |
| Owner letters | 2026-04-14 |
Original record: NHTSA · JSON: /api/recall/26V139000.json · all recent recalls