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NHTSA recall,

Mack TerraPro Trucks

Mack TerraPro trucks have an ECU software error that may allow the engine to start when the transmission is not in Neutral, causing unexpected vehicle movement.

Summary by Recall Canary from the NHTSA notice

What happened

Mack Trucks, Inc. is recalling certain 2022-2027 TerraPro trucks because 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."

Starting the vehicle while in gear may cause unexpected vehicle movement, increasing the risk of a crash or injury.

The recall affects 775 vehicles nationwide. The issue was reported to NHTSA on March 11, 2026. Dealers will update the ECU software, free of charge. Owner notification letters were mailed April 14, 2026.

More engine defect recalls

What to do

If you own a vehicle in this recall:

  1. Check your VIN (vehicle identification number) at nhtsa.gov/recalls.
  2. Dealers will update the ECU software, free of charge.
  3. Owner notification letters were mailed April 14, 2026. You may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0492.
  4. Look for the owner letter. Owner notification letters were mailed April 14, 2026.

What you get Free repair

Full text from NHTSA

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.

Is your Mack affected?

These models and years may be affected.

  • TerraPro (TE), model years 2022 to 2027

Your VIN confirms it. Find the 17-character VIN on the driver's side of the dashboard or on your registration card.

Check your VIN on nhtsa.gov (opens in a new tab)

Recall details

Reported to NHTSA
Sold in
Nationwide
Manufacturer
Mack Trucks, Inc.
Component
Engine defect
Campaign
26V139000
Vehicles affected
775
Repair cost
Free of charge
Owner letters mailed
Manufacturer's recall number
SC0492
Manufacturer phone
1-800-866-1177

All recalls from Mack Trucks, Inc.

Timeline

  1. Reported to NHTSA

  2. Listed on Recall Canary

  3. Summary updated

Other engine defect recalls

See all: Other engine defect recalls

Summary by Recall Canary, written with AI · summary updated Oct 3, 2026 · primary source: U.S. National Highway Traffic Safety Administration (opens in a new tab)