Recall 21V856 affects 79 2021 Mack Granite (Gr) and Lr vehicles for a power steering pump defect. Repair is free at any franchised Mack dealer.
Mack is recalling 79 2021 Granite (Gr) and Lr vehicles under recall 21V856 because a machining defect can let pressure build in the power steering pump and break the shaft seal. The failure can remove power steering assist and increase crash risk, and Mack dealers will complete the recall repair free of charge.
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What's wrong?
The power steering pump on the 2021 Mack Granite (Gr) and Lr helps the driver turn these trucks with less effort. It moves hydraulic fluid under pressure through the steering system, so the steering gear gets assist when the wheel is turned. Without that assist, the steering system still has a mechanical path, but the driver has to supply much more force.
In the recalled trucks, the pump rotor was ground incorrectly during manufacturing. That process left a localized flat area on the end face of the pump motor. As the pump runs, that defect can let pressure build inside the pump and break the shaft seal. Once the seal breaks, the pump loses its ability to provide normal power steering assist.
There is no warning sign before failure. What an owner notices can be a sudden increase in steering effort, especially during slow turns, tight maneuvers, or parking.
Who's affected?
Covers the Granite (Gr) and Lr truck lines in the 2021 model year, both tied to the same power steering system.
| 2021 Mack Granite (Gr) | power steering system |
|---|---|
| 2021 Mack Lr | power steering system |
| Units affected | 79 |
| Field incidents | NHTSA has logged no field incidents to date. |
A matching 2021 Mack Granite (Gr) or Lr does not guarantee inclusion. Check your VIN to confirm whether your specific truck is included.
What's the safety risk?
Loss of power steering assist makes the truck harder to steer and increases the risk of a crash. There is no warning sign before failure, so slow down, avoid sudden steering inputs, and schedule the pump replacement soon. Repair is free at any franchised Mack dealer.
What should I do?
- Check your VIN to confirm your 2021 Mack Granite (Gr) or Lr is included in this recall.
- Contact a franchised Mack dealer to schedule the free power-steering-pump replacement that addresses pressure buildup in the pump and loss of power steering assist.
- Bring the recall notice if Mack mailed one. If not, reference recall number 21V856 and Mack recall SC0432 when you call.
- Drive cautiously until the repair is complete. Plan for heavier steering if power assist is lost and leave extra room.
What happens at the repair
At the dealer, a Mack technician replaces the power steering pump covered by recall 21V856. The replacement parts and labor are free under the recall. The repair addresses the pump defect that can build pressure, break the shaft seal, and leave the truck without power steering assist. If you already paid for a power steering pump repair before the owner notice, Mack's general reimbursement plan covers eligible documented expenses. Bring repair paperwork and proof of payment to the service desk, or ask Mack customer service how to submit the claim.
| Reimbursement | Reimbursement available |
|---|
Timeline
| November 3, 2021 | NHTSA published the recall |
|---|---|
| November 10, 2021 | Dealer notification began |
| November 10, 2021 | Dealer notification ended |
| December 10, 2021 | Owner notification mailed |
| December 22, 2021 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 21V856?
Recall 21V856 covers 79 2021 Mack Granite (Gr) and Lr vehicles with a power steering pump machining defect. The defect can let pressure build in the pump, break the shaft seal, and cause loss of power steering assist, increasing crash risk.
What should I do if my 2021 Mack Granite (Gr) or Lr is on this recall?
Check your VIN to confirm your specific truck is included in recall 21V856. If it is, contact a franchised Mack dealer to schedule the power steering pump replacement. Reference recall 21V856 or Mack recall number SC0432 when you call. The repair is free.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the defect at no cost, and Mack dealers will replace the power steering pump free of charge. Parts and labor are covered for vehicles included in recall 21V856.
Is it safe to drive a 2021 Mack Granite (Gr) or Lr with this recall?
The safety risk is loss of power steering assist, which increases crash risk under recall 21V856. The filing does not give a do-not-drive instruction. Until the pump is replaced, confirm your VIN and ask a Mack dealer whether the truck should stay parked for your route and use.
When were owners notified about recall 21V856?
Mack mailed owner notification letters on December 10, 2021. If you bought the truck used or never received the letter, check your VIN and call Mack customer service at 1-800-866-1177 or a franchised Mack dealer with recall number 21V856.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/21V856000 |
|---|---|
| Mack customer service | 1-800-866-1177 |
| NHTSA recall # | 21V856 |
| NHTSA recall # (full) | 21V856000 |
Source documents
-
Download Recall Document (PDF) (PDF) - 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 20, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →