Recall 26V351 affects 644 2026-2027 Mack Anthem, Granite, Pioneer Pr, and Pinnacle trucks for loose lug nuts. Do not drive. Free repair once available.
Wheel detachment can cause loss of vehicle control or create a road hazard. That raises the risk of a crash or injury. There is no warning sign before failure. Do not drive, including short trips. If the truck must move, arrange a tow. Repair will be free at any franchised Mack dealer once available.
Mack is recalling 644 2026-2027 Anthem (An), Granite (Gr), Pioneer Pr (4), Pinnacle (Pi/Pn), and Anthem An (4) trucks because wheel lug nuts can loosen and let a wheel detach. Do not drive an included truck until the free Mack dealer repair is available and complete.
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What's wrong?
The wheel nuts on these 2026-2027 Mack Granite (Gr), Pioneer Pr (4), Anthem (An), Pinnacle (Pi/Pn), and Anthem An (4) trucks clamp each wheel against the axle flange. They hold the wheel and hub together with a set torque, so the wheel stays tight while the truck carries load, brakes, turns, and rides over rough pavement.
On affected trucks, masking material from the painting process was left between the wheel and the hub mounting surface. That material sits where metal should meet metal. After the wheel is installed, the trapped masking compresses and changes the joint from hard to soft. As the joint settles, clamping force drops and the wheel nuts lose torque. If the nuts loosen far enough, the wheel can detach.
There is no warning sign before failure. An owner or driver should not wait for noise, vibration, or a visible gap to confirm the problem.
Who's affected?
Spans Mack Granite, Pioneer Pr, Anthem, Pinnacle, and Anthem An configurations across the 2026 and 2027 model years, all tied to the same wheel fastener.
| 2026 Mack Granite (Gr) | wheel fastener (lug, nut, bolt, or stud) |
|---|---|
| 2026 Mack Pioneer Pr (4) | wheel fastener (lug, nut, bolt, or stud) |
| 2027 Mack Pioneer Pr (4) | wheel fastener (lug, nut, bolt, or stud) |
| 2026 Mack Anthem (An) | wheel fastener (lug, nut, bolt, or stud) |
| 2026 Mack Pinnacle (Pi/Pn) | wheel fastener (lug, nut, bolt, or stud) |
| 2027 Mack Pinnacle (Pi/Pn) | wheel fastener (lug, nut, bolt, or stud) |
| 2027 Mack Anthem An (4) | wheel fastener (lug, nut, bolt, or stud) |
| 2027 Mack Granite (Gr) | wheel fastener (lug, nut, bolt, or stud) |
| Units affected | 644 |
| Field incidents | NHTSA has logged no field incidents to date. |
A matching year and model does not guarantee inclusion. Check your VIN to confirm whether your specific truck is included.
What's the safety risk?
Wheel detachment can cause loss of vehicle control or create a road hazard. That raises the risk of a crash or injury. There is no warning sign before failure. Do not drive, including short trips. If the truck must move, arrange a tow. Repair will be free at any franchised Mack dealer once available.
What should I do?
- Check your VIN to confirm your 2026-2027 Mack Granite (Gr), Pioneer Pr (4), Anthem (An), Pinnacle (Pi/Pn), or Anthem An (4) is included in this recall.
- Do not drive the truck until Mack confirms the wheel and hub inspection and repair are complete.
- Arrange a tow if the truck has to be moved to a dealer; do not drive it there yourself.
- Wait for Mack's owner letter, then contact a franchised Mack dealer to ask when the free wheel and hub mating-surface inspection is open for your VIN.
- Reference recall number 26V351 and Mack recall SC0495 when you call the dealer or Mack customer service.
What happens at the repair
Do not drive the vehicle until the repair is complete. Mack has not opened the final dealer repair yet. Once available, a Mack technician will inspect the wheel and hub mating surfaces, remove masking material, and replace worn components when needed. Parts and labor will be free under the recall. Mack's standard reimbursement plan covers documented out-of-pocket repairs tied to this issue before the owner notice. Keep repair orders and payment records, and ask Mack customer service or the dealer how to submit them.
| Reimbursement | Reimbursement available |
|---|
Timeline
| May 28, 2026 | NHTSA published the recall |
|---|---|
| May 29, 2026 | Dealer notification began |
| May 31, 2026 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| June 5, 2026 | Dealer notification ended |
Frequently asked questions
What is recall 26V351?
Recall 26V351 covers 644 2026-2027 Mack Granite (Gr), Pioneer Pr (4), Anthem (An), Pinnacle (Pi/Pn), and Anthem An (4) vehicles with wheel lug nuts that can loosen and allow a wheel to detach. Do not drive until a franchised Mack dealer completes the free inspection and repair.
What should I do if my 2026-2027 Mack Granite (Gr), Pioneer Pr (4), Anthem (An), Pinnacle (Pi/Pn), or Anthem An (4) is on this recall?
Check your VIN to confirm your specific vehicle is included in recall 26V351. If it is, do not drive it. Call a franchised Mack dealer, reference recall SC0495, and ask how the vehicle should be moved for the free wheel and hub inspection.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to fix the defect at no cost, and Mack dealers will inspect the wheel and hub mating surfaces, remove masking material, and replace worn components if needed for free.
What does do not drive mean for recall 26V351?
Do not drive the vehicle until the recall repair is complete. Wheel detachment can cause loss of vehicle control or create a road hazard, increasing crash or injury risk. If the vehicle needs to move, ask the Mack dealer about towing or other transport guidance.
What warning signs should I watch for?
The recall record does not list a reliable warning sign before the wheel separates. Treat VIN confirmation as the decision point. If your vehicle is included, do not drive it until a franchised Mack dealer completes the free inspection and repair.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/26V351000 |
|---|---|
| Mack customer service | 1-800-866-1177 |
| NHTSA recall # | 26V351 |
| NHTSA recall # (full) | 26V351000 |
Source documents
This article is generated from NHTSA's primary recall filings and reviewed against the source on June 9, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →