Vehicle recall 26V139000 · March 11, 2026
2022-2027 Mack Terrapro (te)
The engine control unit (ECU) software may allow the engine to start when the transmission is not in Neutral.
Source: NHTSA data as of September 22, 2026. Last refreshed Sep 23, 2026, 2:43 AM UTC.
- Summary
- 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.
- 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.
Recall details
- NHTSA campaign
- 26V139000
- Reported to NHTSA
- March 11, 2026
- Filed by
- Mack Trucks, Inc.
- Manufacturer campaign
- SC0492
- Owner notification
- April 14, 2026
- Vehicles potentially affected
- 775
- Initiated by
- the manufacturer
- Components
- Engine and engine cooling › Engine › Engine control module (ECU/ECM) › Software
Vehicles covered
As listed by NHTSA. A recall usually covers only some vehicles of each model and year, often a production date range.
Has your Mack been repaired?
Recalls here come from NHTSA’s records for the model and year. Not every vehicle of a model is included in every recall, and this site can’t see whether a repair has been done. Only a VIN lookup can tell you that.
NHTSA’s VIN search doesn’t show recalls that were already repaired, recalls more than 15 years old, or some small manufacturers’ recalls. A Mack dealer can also check your VIN. Recall repairs are free.