NHTSA recall 26V139000
A recall listed here may apply to a vehicle of this year, make and model. Only the manufacturer can say whether it applies to one vehicle: check the VIN with the official lookups.
| Published by | NHTSA (United States) |
|---|---|
| Campaign number | 26V139000 |
| Manufacturer's number | SC0492 |
| Manufacturer | Mack Trucks, Inc. |
| Reported | 2026-03-11 |
| Owners notified | 2026-04-14 |
| Component | ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE |
| Units potentially affected | 775 |
| Part numbers | 26130102 |
| Report | Quarterly report 2, for 2026 quarter 3 |
|---|---|
| Filed with NHTSA | 2026-10-07 |
| Vehicles in the campaign | 775 |
| Reported remedied | 306 (39%) |
| Reported unreachable | 0 |
| Reported removed | 0 |
These are the manufacturer's totals for the whole campaign at the end of 2026 quarter 3, as filed with NHTSA. They do not say whether one vehicle has been remedied: check the VIN with the official lookups. The reports are from data as of 2026-10-19.
What is wrong
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."
What can happen
Starting the vehicle while in gear may cause unexpected vehicle movement, increasing the risk of a crash or injury.
The 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.
| 2022 MACK TERRAPRO (TE) | Built 2021-01-11 to 2026-02-24. Listed as a series or trim of this model. |
|---|---|
| 2023 MACK TERRAPRO (TE) | Built 2021-01-11 to 2026-02-24. Listed as a series or trim of this model. |
| 2024 MACK TERRAPRO (TE) | Built 2021-01-11 to 2026-02-24. Listed as a series or trim of this model. |
| 2025 MACK TERRAPRO (TE) | Built 2021-01-11 to 2026-02-24. Listed as a series or trim of this model. |
| 2026 MACK TERRAPRO (TE) | Built 2021-01-11 to 2026-02-24. Listed as a series or trim of this model. |
| 2027 MACK TERRAPRO (TE) | Built 2021-01-11 to 2026-02-24. Listed as a series or trim of this model. |
A vehicle with no link is not in this site's catalog, which covers cars, multipurpose vehicles and trucks by model year. The campaign is from data as of 2026-10-19.
Bulletins for the same vehicles and component
| KC-2043 Rev 4 | 2023-07-06. Service bulletin. Engine Control Module (EMS) Software (MSW) Information - Improvement List, Through June 2023 - US21+OBD2020 Emissions |
|---|
A bulletin is the manufacturer's note to its dealers. It is not part of this recall.