Recall 25V256 affects 3 2025 Mack Anthem (An) trucks for loose idler gear bracket fasteners. Repair is free at any franchised Mack dealer.
Mack is recalling 3 2025 Anthem (An) vehicles because improperly tightened idler gear bracket fasteners can let the idler gear detach from the engine. A detached gear can damage the engine, cause a stall, and increase the risk of a crash or injury; Mack dealers will complete the free repair.
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What's wrong?
The turbocompound unit on the 2025 Mack Anthem (An) is part of the diesel engine system. It recovers energy from exhaust flow and sends that power back through engine gearing, helping the engine use fuel energy more efficiently. An idler gear and its bracket keep that gear train aligned while the engine is running.
On affected trucks, the idler gear bracket fasteners were not tightened correctly, or the truck has missing torque records for those fasteners. When the bracket is not clamped correctly, the idler gear can move out of position and detach from the engine. Mack traced the issue to insufficient torque process control and record keeping during production or service.
Before failure, the warning sign to watch for is an engine indicator lamp. The truck can also run rough before losing motive power, which means engine power drops off enough that the vehicle no longer drives under its own power.
Who's affected?
| 2025 Mack Anthem (An) | Diesel |
|---|---|
| Units affected | 3 |
| Field incidents | NHTSA has logged no field incidents to date. |
Not every 2025 Mack Anthem (An) truck is on the list. Check your VIN to confirm whether your specific truck is included.
What's the safety risk?
A detached idler gear can damage the engine, cause a stall, and increase the risk of a crash or injury. Watch for an engine indicator lamp or rough running, and schedule the recall repair soon if your VIN is included. Repair is free at any franchised Mack dealer.
What should I do?
- Check your VIN to confirm your 2025 Mack Anthem (An) is included in this recall.
- Contact your nearest franchised Mack dealer to schedule the free inspection for loose idler-gear bracket fasteners and turbo compound unit replacement when needed.
- Bring the recall notice if Mack mailed one. If not, reference recall number 25V256 when you call.
- Drive cautiously until the repair is complete. If the engine stalls or loses power, pull over when safe and arrange service before moving it again.
- Call Mack customer service at 1-800-866-1177 with questions, and reference Mack recall SC0477.
What happens at the repair
At the dealer, a Mack technician inspects the turbo compound units related to this recall and replaces any unit that needs replacement. The recall repair, including parts and labor, is free. If you already paid out of pocket for this same turbo compound unit repair before the recall notice, Mack's standard reimbursement plan covers documented expenses. Bring repair invoices and payment records to the service desk or contact Mack customer service for claim instructions.
| Reimbursement | Reimbursement available |
|---|
Timeline
| April 17, 2025 | NHTSA published the recall |
|---|---|
| April 24, 2025 | Owner notification mailed |
| April 24, 2025 | Dealer notification began |
| April 24, 2025 | Dealer notification ended |
| June 11, 2025 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 25V256?
Recall 25V256 covers 3 2025 Mack Anthem (An) vehicles with idler gear bracket fasteners that were improperly tightened. The idler gear can detach from the engine, damage the engine, and cause a stall. Mack dealers will inspect and replace the turbo compound units as needed for free.
What should I do if my 2025 Mack Anthem (An) is on this recall?
Check your VIN to confirm your specific truck is included in recall 25V256. If it is, contact a franchised Mack dealer to schedule the inspection and any needed turbo compound unit replacement. Reference Mack recall number SC0477 when you call. The repair is free.
Is the recall repair free?
Yes. Federal recall law requires manufacturers to repair the defect at no cost, and Mack will inspect and replace the turbo compound units as needed free of charge at a franchised Mack dealer.
What is the safety risk?
The safety risk is an engine stall. If the idler gear detaches, it can damage the engine and cause the truck to stall, increasing the risk of a crash or injury. Confirm the VIN first, then schedule the free dealer repair if the truck is included.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/25V256000 |
|---|---|
| Mack customer service | 1-800-866-1177 |
| NHTSA recall # | 25V256 |
| NHTSA recall # (full) | 25V256000 |
Source documents
-
Download Quarterly Report (PDF) - Download Misc. Document (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 19, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →