Recall 24V399 affects 24 2024 Mack Md (Electric) trucks for battery management software shutdown. Do not drive. Free software update at a franchised Mack dealer.
A sudden loss of steering control and drive power increases the risk of a crash. There is no warning sign before failure. Do not drive it, even for short trips, until the battery management system software update is complete. If it must move, ask the Mack dealer about towing. Repair is free at any franchised Mack dealer.
Mack is recalling 24 2024 Md (Electric) trucks under recall 24V399 because battery management software can shut down the high-voltage battery, causing sudden loss of steering control and drive power. Do not drive an included truck until a Mack dealer completes the free repair; the failure increases the risk of a crash.
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What's wrong?
The 2024 Mack Md (Electric) uses a high-voltage battery pack to feed the electric drive system. Its battery management system, or BMS, is software that watches battery charge and controls how the pack handles power flow, including regenerative braking when the truck is slowing down.
On affected trucks, the BMS software does not manage regenerative braking correctly when the battery is at a high state of charge. That condition can trigger a high-voltage battery shutdown. If the battery shuts down while the truck is moving, the driver can lose drive power and steering control. Mack's repair is updated BMS software that manages regenerative braking during high battery charge. Do not drive the vehicle until repairs have been completed.
There is no warning sign before failure. The shutdown happens without an advance alert, so owners should not rely on a warning light, sound, or change in truck behavior before the problem occurs.
Who's affected?
| 2024 Mack Md (Electric) | high-voltage traction battery |
|---|---|
| Units affected | 24 |
| Field incidents | NHTSA has logged no field incidents to date. |
Not every 2024 Mack Md (Electric) truck is on the list. Check your VIN to confirm whether your specific truck is included.
What's the safety risk?
A sudden loss of steering control and drive power increases the risk of a crash. There is no warning sign before failure. Do not drive it, even for short trips, until the battery management system software update is complete. If it must move, ask the Mack dealer about towing. Repair is free at any franchised Mack dealer.
What should I do?
- Check your VIN to confirm your 2024 Mack Md (Electric) is included in this recall.
- Do not drive the truck until the battery management system software update is complete.
- Arrange a tow if the truck has to be moved to the dealer; do not drive it there yourself.
- Contact your nearest franchised Mack dealer to schedule the free software update that addresses the high-voltage battery shutdown tied to sudden loss of steering control and drive power.
- Bring the recall notice if you have it. Reference recall number 24V399 and Mack recall SC0464 when you call.
What happens at the repair
At the dealer, a Mack technician updates the battery management system software so the recalled software condition is corrected. Do not drive the truck until that update is complete. The recall repair is free, with parts and labor covered. If you already paid out of pocket for this software related repair before the recall notice, Mack's standard reimbursement plan covers documented expenses. Bring your repair paperwork to the service desk or contact Mack customer service to start the claim.
| Reimbursement | Reimbursement available |
|---|
Timeline
| June 4, 2024 | NHTSA published the recall |
|---|---|
| June 11, 2024 | Dealer notification began |
| June 11, 2024 | Dealer notification ended |
| July 10, 2024 | Owner notification mailed |
| August 2, 2024 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| August 2, 2024 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 24V399?
Recall 24V399 covers 24 2024 Mack Md (Electric) trucks with battery management system software that can shut down the high-voltage battery. That shutdown can cause sudden loss of steering control and drive power, increasing crash risk. Do not drive the truck until Mack completes the free software update.
What should I do if my 2024 Mack Md (Electric) is on this recall?
Check your VIN to confirm your specific truck is included in recall 24V399. If it is, do not drive the vehicle until the remedy is complete. Contact a franchised Mack dealer or Mack customer service at 1-800-866-1177 and reference Mack recall SC0464.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair this defect at no cost. Mack dealers will update the battery management system software free of charge, and owner letters were mailed July 10, 2024.
What does "do not drive" mean for this Mack recall?
Do not drive means the truck should stay parked until the dealer completes the battery management system software update. The defect can shut down the high-voltage battery and cause sudden loss of steering control and drive power, so arrange the repair before moving the vehicle.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/24V399000 |
|---|---|
| Mack customer service | 1-800-866-1177 |
| NHTSA recall # | 24V399 |
| NHTSA recall # (full) | 24V399000 |
Source documents
-
Download Quarterly Report (PDF) - Download Recall Investigation Document (PDF) (PDF)
- Download Owner Notification Letter (PDF)
- Download Owner Notice (PDF)
- Download Recall Acknowledgement (PDF)
- Download Recall Report (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 20, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →