Engine control module (ecu/ecm): softwareRecall 26V-139 · 2022–2027 Mack Terrapro (te)
Mack Trucks, Inc. recall 26V-139 covers 775 2022–2027 Mack Terrapro (te) for a engine control module (ecu/ecm): software problem, reported to NHTSA on March 11, 2026. The manufacturer's latest report (2026 Q3) shows 39% of affected vehicles repaired.
Source: NHTSA recall 26V139000 and manufacturer quarterly reports. Started by the manufacturer.
The problem
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 fix
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 repairs are free. Confirm whether this recall is open on your vehicle by entering its VIN at nhtsa.gov/recalls.
How fast cars are being fixed
39%repaired
Share of affected vehicles repaired in each quarterly report the manufacturer filed with NHTSA.