# NHTSA recall 21V856000

A recall listed here may apply to a vehicle of this year, make and model. Only the manufacturer can say whether it applies to one vehicle: check the VIN with the official lookups.

- Published by: NHTSA \(United States\)
- Campaign number: 21V856000
- Manufacturer's number: SC0432
- Manufacturer: Mack Trucks, Inc.
- Reported: 2021\-11\-03
- Owners notified: 2021\-12\-10
- Component: STEERING:HYDRAULIC POWER ASSIST:PUMP
- Units potentially affected: 79
- Part numbers: 21718559

## What is wrong

Mack Trucks, Inc. \(Mack\) is recalling certain 2021 Granite and LR vehicles.  A machining defect may cause pressure to build in the power steering pump and break the shaft seal, resulting in a loss of power steering assist.


## What can happen

A loss of power steering assist increases the risk of a crash.


## The remedy

Dealers will replace the power steering pump, free of charge.  Owner notification letters were mailed on December 10, 2021.   Owners may contact Mack customer service at 1\-800\-866\-1177.  Mack's number for this recall is SC0432.


## Notes

Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1\-888\-327\-4236 \(TTY 1\-800\-424\-9153\), or go to www.nhtsa.gov.


## Remedy progress the manufacturer reported

- Report: Annual report 3, for 2025 quarter 4 to 2026 quarter 3
- Filed with NHTSA: 2026\-10\-07
- Vehicles in the campaign: 79
- Reported remedied: 57 \(72%\)
- Reported unreachable: 0
- Reported removed: 0

These are the manufacturer's totals for the whole campaign at the end of 2026 quarter 3, as filed with NHTSA. They do not say whether one vehicle has been remedied: check the VIN with the official lookups. The reports are from data as of 2026\-10\-19.

## Vehicles this campaign lists

- [2021 MACK GRANITE \(GR\)](/makes/mack/granite/2021/recalls.md). Listed as a series or trim of this model.
- [2021 MACK LR](/makes/mack/lr/2021/recalls.md)

## Check a VIN

- [NHTSA recall lookup by VIN, United States](https://www.nhtsa.gov/recalls)
- [Transport Canada recall search, Canada](https://wwwapps.tc.gc.ca/Saf-Sec-Sur/7/VRDB-BDRV/search-recherche/menu.aspx?lang=eng)

JSON: [/v1/recalls/nhtsa/21V856000](/v1/recalls/nhtsa/21V856000)

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