Mack engine control unit (ECU) software may allow the engine to start when the transmission is not in Neutral.
The short version
Mack Trucks, Inc. reported a problem with the engine control module (ecu/ecm) software. Here is what owners need to know.
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."
Starting the vehicle while in gear may cause unexpected vehicle movement, increasing the risk of a crash or injury.
Take it to a dealer — they will update the ECU software, free of charge.
Affected vehicles
These model years are included in NHTSA campaign 26V-139.
| YEAR RANGE | MODEL |
|---|---|
| 2022–2027 | Mack Terrapro |
What changed
Newest first. The record shows both when the recall began and what has changed since.
- Recall reported to NHTSA. LATEST
Drive one of these? Check your VIN to see if your specific vehicle is affected.
Check your VINWhat this record means
Data from the NHTSA recall database. A clean VIN check means no open federal recalls for that vehicle — not that it never had one.
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MyAutoRecalls is not affiliated with Mack Trucks, Inc. or the National Highway Traffic Safety Administration.