Mack Trucks Recalls TerraPro Models Over Engine Start Software Defect
Mack Trucks is recalling approximately 4,650 TerraPro trucks from model years 2022-2027 because the engine may start while the transmission is in gear, increasing crash risks.
What Happened
Mack Trucks, Inc. is recalling certain TerraPro trucks because the engine control unit (ECU) software may allow the engine to start even when the transmission is not in the Neutral position. This defect means the vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 102, which governs “Transmission Shift Lever Sequence, Starter Interlock, and Transmission Braking Effect.”
Which Products Are Affected
The recall affects approximately 4,650 units of the following vehicles:
- Make: MACK
- Model: TERRAPRO (TE)
- Model Years: 2022, 2023, 2024, 2025, 2026, and 2027
What You Should Do
Owners of the affected vehicles are advised to contact Mack Trucks customer service at 1-800-866-1177. Mack’s internal number for this recall is SC0492. Dealers will update the ECU software free of charge to ensure the starter interlock functions correctly. Owner notification letters are expected to be mailed by May 8, 2026. Vehicle Identification Numbers (VINs) involved in this recall became searchable on the NHTSA website as of March 18, 2026.
Why This Matters
Starting a vehicle while it is in gear may cause unexpected vehicle movement. This sudden movement significantly increases the risk of a crash or injury to the driver and those in the vicinity of the vehicle.
Source
Source: NHTSA Official Notice
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