Recall 25V427 affects 148 2024-2026 Mack Md (Electric) trucks for a throttle software defect. Repair is free at any franchised Mack dealer.
Mack is recalling 148 2024-2026 Md (Electric) vehicles under recall 25V427 because an interrupted CAN communication signal can leave the engine holding the last throttle setting instead of returning to idle. That delayed return to idle can cause loss of vehicle control, and Mack dealers will complete the repair free of charge.
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What's wrong?
The 2024-2026 Mack Md (Electric) uses a control unit and vehicle software to read the accelerator request and manage throttle output. In normal operation, the accelerator system should return the engine to idle when the driver releases the pedal. The Controller Area Network, or CAN, is the communication path that lets those control units pass messages across the truck.
On affected trucks, a CAN communication interruption can leave the electro mobility control unit holding the last known throttle signal. Instead of dropping back to idle as intended, the engine continues using that retained throttle command. Mack traced the issue to incomplete vehicle validation in the integration between the truck systems and the electric mobility platform supplier, so the repair is a software update that forces throttle output back to idle.
The warning sign is an instrument-cluster alert during a CAN bus failure. If that warning appears, treat it as the truck telling you the communication system has a fault.
Who's affected?
Spans the 2024, 2025, and 2026 Md (Electric) trucks, with the same GVCU control unit listed for electrical system software and throttle position sensor components.
| 2024 Mack Md (Electric) | electrical system software |
|---|---|
| 2025 Mack Md (Electric) | Throttle position sensor (tps) |
| 2025 Mack Md (Electric) | electrical system software |
| 2024 Mack Md (Electric) | Throttle position sensor (tps) |
| 2026 Mack Md (Electric) | Throttle position sensor (tps) |
| 2026 Mack Md (Electric) | electrical system software |
| Units affected | 148 |
| Field incidents | NHTSA has logged no field incidents to date. |
The year and model narrow the scope, but the VIN decides. Check your VIN to confirm whether your specific truck is included.
What's the safety risk?
If the engine does not return to idle quickly enough, the driver can lose vehicle control and the crash risk increases. A CAN bus failure should trigger an instrument cluster warning, so treat that warning as a reason to slow down, pull over when safe, and call a Mack dealer. Repair is free at any franchised Mack dealer.
What should I do?
- Check your VIN to confirm your 2024-2026 Mack Md (Electric) is included in this recall.
- Contact a franchised Mack dealer to schedule the free control-unit software update that fixes the throttle signal issue after interrupted CAN communication.
- Bring the recall notice if Mack mailed one. If not, reference recall number 25V427 and Mack recall SC0481 when you call.
- Drive cautiously until the repair is complete, leave extra following distance, and watch for the engine not returning to idle as expected.
What happens at the repair
At the dealer, a Mack technician updates the control unit software tied to the accelerator control system. The software update is free under the recall, with parts and labor covered. Mack used its general reimbursement plan on file for this campaign, so documented owner paid repairs related to this condition before the recall notice are handled through that plan. If you already paid for a related repair, bring the repair order and payment paperwork to the service desk or contact Mack customer service to ask how to submit the claim.
| Reimbursement | Reimbursement available |
|---|
Timeline
| June 23, 2025 | NHTSA published the recall |
|---|---|
| June 27, 2025 | Dealer notification began |
| June 27, 2025 | Dealer notification ended |
| June 27, 2025 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| August 14, 2025 | Owner notification mailed |
Frequently asked questions
What is recall 25V427?
Recall 25V427 covers 148 2024-2026 Mack Md (Electric) vehicles with control unit software that can keep the engine from returning to idle after CAN communications are interrupted. Mack dealers will update the control unit software for free.
What should I do if my 2024-2026 Mack Md (Electric) is on this recall?
Check your VIN to confirm your specific vehicle is included in recall 25V427. If it is, contact a franchised Mack dealer to schedule the control unit software update. Reference Mack recall SC0481 when you call. The repair is free.
Is the recall repair free?
Yes. Federal recall law requires manufacturers to repair safety defects at no cost, and Mack dealers will update the control unit software free of charge. Mack's recall number for this repair is SC0481.
What is the safety risk?
The safety risk is loss of vehicle control. If the engine does not return to idle quickly enough, the vehicle can keep responding to the last known throttle setting. That raises crash risk. The dealer repair is a free control unit software update.
When were owners notified about this Mack recall?
Mack mailed owner notification letters on August 14, 2025. If you bought the vehicle used or never received a letter, check your VIN and call a franchised Mack dealer. You can also contact Mack customer service at 1-800-866-1177.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/25V427000 |
|---|---|
| Mack customer service | 1-800-866-1177 |
| NHTSA recall # | 25V427 |
| NHTSA recall # (full) | 25V427000 |
Source documents
-
Download Quarterly Report (PDF) - Download Recall Investigation Document (PDF) (PDF)
- Download Owner Notification Letter (PDF)
- Download Owner Notice (PDF)
- Download Recall Report (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 19, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →