Mack recalls 2022–2027 TerraPro trucks over software that lets engine start while in gear
The engine control software may let the engine start when the transmission is not in Neutral, which can make the truck move unexpectedly and raise the risk of a crash or injury.
What to do
Dealers will update the engine software for free. Owners can call Mack customer service at 1-800-866-1177 and mention recall number SC0492.
Look up your car to see every recall for its make, model and year.
Recall details
- Product
- Mack Terrapro (Te) 2022–2027
- Company
- Mack Trucks, Inc.
- Hazard
- Starting the vehicle while in gear may cause unexpected vehicle movement, increasing the risk of a crash or injury.
- Units
- 775 vehicles
- Owner notification
- April 14, 2026
- Reported to NHTSA
- March 11, 2026
- Identifiers
- NHTSA campaign number: 26V139000
- Manufacturer campaign number: SC0492
- Model years: 2022–2027
The headline, summary and steps above are written in plain English from the official notice below. Identifiers are copied exactly as the agency published them. Always check the official notice before you act.
Official notice
The notice's own wording from NHTSA.
- Component
- ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
- 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."
- Consequence
- Starting the vehicle while in gear may cause unexpected vehicle movement, increasing the risk of a crash or injury.
- Corrective action
- 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.
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