Mack Trucks, Inc. recall 26V139

Affected vehicles (1)

Component / system

Defect

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."

Risk / consequence

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

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.

Chronology of events

1. Feb 10, 2026

   February 10, 2026: Compliance team discovers potential non-compliance during audit, Safety Office opens a product safety investigation.

2. Feb 11, 2026

   February 11, 2026: Safety Office notifies quality and engineering organizations of potential non- compliance for further investigation.

3. Feb 23, 2026

   February 23, 2026: Product Safety Evaluation Committee review, recommends escalation to Product Safety Committee.

4. Mar 4, 2026

   March 4, 2026: Product Safety Committee determines that a non-compliance exists and decides to initiate a recall. There have been 0 warranty claims, field reports, accidents, or injuries reported with this issue.

Notification schedule

Dealer notification

Mar 18, 2026 - Mar 18, 2026 No Dealers

Owner notification

May 08, 2026 - May 11, 2026 Phased Recall