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.
NHTSA's own wording · initiated by MFR
Vehicles covered
| Model | Model years |
|---|---|
| Mack Terrapro (te) | 2022, 2023, 2024, 2025, 2026, 2027 |
Components: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
Model years in this recall
NHTSA complaints and the number of recall campaigns for each model year this recall covers.
| Model | Year | Complaints | Recalls |
|---|---|---|---|
| Mack Terrapro (te) | 2022 | 0 | 5 |
| Mack Terrapro (te) | 2023 | 0 | 4 |
| Mack Terrapro (te) | 2024 | 0 | 7 |
| Mack Terrapro (te) | 2025 | 0 | 4 |
| Mack Terrapro (te) | 2026 | 0 | 1 |
| Mack Terrapro (te) | 2027 | 0 | 1 |
Other engine and engine cooling recalls in 2026
17 of the 666 recall campaigns reported to NHTSA in 2026 concerned the engine and engine cooling; Mack Trucks, Inc. filed 118 campaigns in all.
| 26V659000 7 Oct 2026 | Toyota Motor Engineering & Manufacturing |
| 26V573000 3 Sept 2026 | Nova Bus (US) Inc. |
| 26V548000 25 Aug 2026 | Ford Motor Company |
| 26V532000 13 Aug 2026 | Ford Motor Company |
| 26V343000 27 May 2026 | Ford Motor Company |
| 26V320000 20 May 2026 | Toyota Motor Engineering & Manufacturing |
| 26V287000 6 May 2026 | Corp. Micro Bird, Inc. |
| 26V286000 6 May 2026 | Corp. Micro Bird, Inc. |
NHTSA recalls (public domain) · all recalls of 2026