Mack TerraPro (TE) 2022-2027 Trucks: Engine Starts in Gear Risk
Mack recalls 2022-2027 TerraPro trucks with faulty engine software that may start when in gear, risking crashes. Owners must update ECU software free by dealers.
Use caution until it’s fixed
Starting the vehicle while in gear may cause unexpected vehicle movement, increasing the risk of a crash or injury.
What happened, in plain English
Mack is recalling certain 2022-2027 TerraPro trucks because their engine software can start the vehicle while in gear, potentially causing crashes or injuries. This issue affects vehicles that do not meet federal safety standards for transmission and starter interlock. Read more at govinfonow.com/recall/1342261-mack-terrapro-te-2022-2027-trucks-engine-starts-in-gear.
Source Summary by GovInfoNow · govinfonow.com/recall/1342261-mack-terrapro-te-2022-2027-trucks-engine-starts-in-gear · Updated October 8, 2026 · Official notice: NHTSA #26V139000
Cite this page
“Mack TerraPro (TE) 2022-2027 Trucks: Engine Starts in Gear Risk.” GovInfoNow, updated October 8, 2026. https://govinfonow.com/recall/1342261-mack-terrapro-te-2022-2027-trucks-engine-starts-in-gear. Based on NHTSA recall #26V139000 (https://www.nhtsa.gov/recalls?nhtsaId=26V139000).
Why it’s dangerous
The engine control unit software may allow the engine to start while the transmission is not in Neutral. This can cause the vehicle to move unexpectedly, increasing the risk of a crash or injury if the driver is not prepared.
Who’s affected
Owners of 2022-2027 Mack TerraPro trucks with the specific engine control unit software are affected. Drivers who operate these trucks without the fix are at risk of unexpected movement when starting the vehicle.
How to tell if you have this one
Check if your Mack TerraPro truck was manufactured between 2022 and 2027. The recall involves specific engine control unit software that may not be in Neutral when starting the vehicle.
- Brand
Mack- Category
Vehicle
What to do — step by step
Update ECU Software
Dealers will update the engine control unit software for free to prevent the vehicle from starting in gear.
What NHTSA says to do
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.
How this recall unfolded
Recall timeline
Owners were mailed letters 34 days after NHTSA received the defect report.
- NHTSA received the defect report
- Owner letters mailed
- Added to GovInfoNow
Dates from the agency record only; steps without a date are left out.
Keep exploring
Where this comes from
The facts (hazard, remedy, dates, manufacturer) are pulled from the official NHTSA recall record. The plain-language summary and step-by-step checklist are written by GovInfoNow to make the official notice easier to act on — they don’t replace it.
- Official source: NHTSA Recall #26V139000 (March 11, 2026)
- Plain-language summary written by qwen3:4b on October 8, 2026, from the official record above. Not reviewed by a person — if it conflicts with the NHTSA notice, the notice is correct. Report an error on this page.
- GovInfoNow is an independent service and is not a government agency. We republish official NHTSA recall data; we don’t issue, amend or administer recalls.