Mack official notice describes a safety defect, but the details were not provided in plain language.
The short version
Mack Trucks, Inc. reported a problem with the other owners/service/other manual. Here is what owners need to know.
The official notice describes a safety defect, but the details were not provided in plain language.
A false hill start assist message can lead to unexpected vehicle rollback on an incline, increasing the risk of a crash.
Take it to a dealer — they will update the dashboard notification software and add a correction to the owner's manual, free of charge.
Affected vehicles
These model years are included in NHTSA campaign 26V-719.
| YEAR RANGE | MODEL |
|---|---|
| 2024–2026 | Mack MD |
What changed
Newest first. The record shows both when the recall began and what has changed since.
One of 9 recalls filed by Mack in 2026 · filed 9 days ago · last verified Nov 7, 2026
- Recall reported to NHTSA. LATEST
Drive one of these? Check your VIN to see if your specific vehicle is affected.
Check your VINOther recalls for this model
Same Mack MD — newest first.
- Mack when the Controller Area Network (CAN) communications are interrupted, the throttle signal from the electro mobility control unit may retain the last known throttle setting, and the engine will not return to idle as intended.
- Mack center bench seat belt assembly may be routed incorrectly.
- Mack incorrectly assembled high voltage connector could prevent the mechanical connector lock from properly engaging, allowing the high voltage cable to loosen. DO NOT DRIVE
- Mack battery management system software may cause the high-voltage battery to shut down, which can result in a sudden loss of steering control and drive power. DO NOT DRIVE
- Mack gross Axle Weight Rating (gawr) listed on the vehicle certification label is incorrect, which can allow the vehicle to be overloaded.
- Mack park brake light may indicate the incorrect brake status due to an incorrect park brake pressure switch.
What this record means
Data from the NHTSA recall database. A clean VIN check means no open federal recalls for that vehicle — not that it never had one.
Not affiliated
MyAutoRecalls is not affiliated with Mack Trucks, Inc. or the National Highway Traffic Safety Administration.
Record dates
Reported to NHTSA: October 29, 2026
First tracked here: Nov 6, 2026
Last change: Nov 6, 2026
Official record
NHTSA campaign: 26V719000
Manufacturer campaign: SC0502
Owner notification: Owner notification letters scheduled — expected starting December 28, 2026.
View this recall on NHTSA.gov →