NHTSA campaign 26V139000 · Mack campaign SC0492
Mack Recall 26V-139: ECU Software Error May Cause Unexpected Vehicle Movement/FMVSS 102
NHTSA recall 26V139000 (Mack campaign SC0492) was reported by Mack Trucks, Inc. on March 11, 2026, with 775 vehicles potentially affected (per NHTSA). NHTSA's record lists the Mack TERRAPRO (TE) for model years 2022–2027. Owners were notified on April 14, 2026, per NHTSA.
Updated daily from NHTSA's recall files
Is my vehicle included?
This page lists, by model year, the vehicles NHTSA's recall record names for campaign 26V139000 in the model years try.vin imports (1995 and later); NHTSA's own record can list more. A model year on the list doesn't mean every vehicle of that year is included, and some may already have been repaired.
To see whether a specific vehicle is included and still needs the repair, enter its VIN at nhtsa.gov/recalls.
Free VIN check: decode a VIN to see its year, make and model.
Key facts
- NHTSA campaign
- 26V139000 (also written 26V-139 or 26V139)
- Filed by
- Mack Trucks, Inc.
- Mack campaign number
- SC0492
- Report received
- Potentially affected
- 775 vehicles (per NHTSA)
- Component
- Engine and Engine Cooling — Engine — Engine Control Module (ECU/ECM) — Software
- Owners notified
- Safety standard
- FMVSS 102
Repair completion: 39.48% (latest rate the manufacturer reported to NHTSA; dataset updated October 21, 2026)
NHTSA cautions against comparing completion rates across recalls or manufacturers. How try.vin reads them.
Vehicles listed for this recall
NHTSA's recall record lists these vehicles for recall 26V139000. try.vin imports model years 1995 and later, so NHTSA's own list can be longer. Model years with a try.vin recall page link to it. Build dates are NHTSA's range for a model year (per NHTSA); a vehicle built in that range is not necessarily included.
NHTSA's recall notice
As NHTSA's recall record states it for campaign 26V139000.
Defect description
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."
Safety consequence
Starting the vehicle while in gear may cause unexpected vehicle movement, increasing the risk of a crash or injury.
Manufacturer 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.
Sources
Official NHTSA notice for recall 26V139000
Campaign details come from NHTSA's recall files, which try.vin imports once a day. The plain-language subject and the completion rate come from the U.S. Department of Transportation's Recalls Data dataset. How try.vin reads recall data.