Recall 24V504 affects 59 2025 Mack Pioneer Pr (4), Granite (Gr), and Lr trucks for tie rod ball stud failure. Repair is free at any franchised Mack dealer.
Mack is recalling 59 2025 Pioneer Pr (4), Granite (Gr), and Lr vehicles equipped with Composilite EXS20 steerable lift axle suspension assemblies because an improperly heat-treated tie rod ball stud can fail. If the ball stud separates, it can become a road hazard and raise crash risk; Mack dealers will complete the recall repair free of charge.
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What's wrong?
On 2025 Mack Pioneer Pr (4), Granite (Gr), and Lr trucks with COMPOSILITE EXS20 steerable lift axle suspension assemblies, the tie rod assembly is part of the steering linkage for the lift axle. The tie rod connects steering points across the axle, and the ball studs let that linkage pivot as the suspension moves and the wheels steer.
On affected trucks, some ball studs were mixed into production after an experimental heat treatment process left them improperly hardened. Heat treatment controls the strength of the metal. When the ball stud is not hardened correctly, it does not have the intended strength inside the tie rod assembly and can fail during vehicle operation.
There is no warning sign before failure. The absence of a symptom does not mean the tie rod assembly is unaffected, because the problem is tied to the suspect ball studs installed in the recalled lift axle assemblies.
Who's affected?
3 Mack truck lines share the same tie rod (steering linkage) scope, and VINs have been searchable since August 30, 2024.
| 2025 Mack Pioneer Pr (4) | tie rod (steering linkage) |
|---|---|
| 2025 Mack Granite (Gr) | tie rod (steering linkage) |
| 2025 Mack Lr | tie rod (steering linkage) |
| Units affected | 59 |
| 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?
A failed ball stud can separate from the vehicle and become a road hazard, increasing the risk of a crash. There is no warning sign before the ball stud fails, so schedule the inspection and any needed tie rod end assembly replacement soon. Repair is free at any franchised Mack dealer.
What should I do?
- Check your VIN to confirm your 2025 Mack Pioneer Pr (4), Granite (Gr), or Lr truck is included in this recall.
- Contact a franchised Mack dealer to schedule the free tie rod end inspection and replacement that addresses the improperly heat-treated ball stud.
- Bring the recall notice if Mack mailed one. If not, reference recall number 24V504 when you call.
- Drive cautiously until the repair is complete, and avoid hauling or driving the truck longer than needed.
- Call Mack customer service at 1-800-866-1177 with questions about scheduling or dealer instructions.
What happens at the repair
At the dealer, a Mack technician inspects the tie rod end assemblies on the steerable lift axle suspension and replaces any covered assemblies that need replacement. The recall repair is free, with parts and labor covered. If you already paid out of pocket for a related tie rod end assembly repair before the recall notice, Mack's standard reimbursement plan covers documented expenses. Bring prior repair paperwork and receipts to the service desk so the dealer can explain the claim process.
| Reimbursement | Reimbursement available |
|---|
Timeline
| July 2, 2024 | NHTSA published the recall |
|---|---|
| July 5, 2024 | Dealer notification began |
| July 5, 2024 | Dealer notification ended |
| July 15, 2024 | Owner notification mailed |
| August 30, 2024 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| August 30, 2024 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 24V504?
Recall 24V504 covers 59 2025 Mack Pioneer Pr (4), Granite (Gr), and Lr vehicles with Composilite EXS20 steerable lift axle suspension assemblies. The tie rod assembly ball stud can fail after improper heat treatment. Mack dealers will inspect and replace the tie rod end assemblies for free.
What should I do if my 2025 Mack Pioneer Pr (4), Granite (Gr), or Lr is on this recall?
Check your VIN to confirm your specific truck is included in recall 24V504. If it is included, contact a franchised Mack dealer to schedule the tie rod end inspection and replacement. Reference recall number 24V504 or Mack recall SC0468 when you call.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the defect at no cost, and Mack says dealers will inspect and replace the tie rod end assemblies as necessary, free of charge.
What is the safety risk?
The safety risk is that the ball stud can separate from the vehicle and become a road hazard. That increases crash risk for the truck and other road users. If your VIN is included, schedule the free dealer repair.
When were owners notified about recall 24V504?
Mack mailed owner notification letters on July 15, 2024. If you bought the truck used or never received the letter, the VIN still decides whether the recall applies. Check your VIN, then call a franchised Mack dealer if it is included.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/24V504000 |
|---|---|
| Mack customer service | 1-800-866-1177 |
| NHTSA recall # | 24V504 |
| NHTSA recall # (full) | 24V504000 |
Source documents
-
Download Quarterly Report (PDF) - Download Owner Notification Letter (PDF)
- Download Recall Investigation Document (PDF) (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 →