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NHTSA campaign 21V856000 · Mack campaign SC0432

Mack Recall 21V-856: Broken Shaft Seal May Cause Loss of Power Steering

NHTSA recall 21V856000 (Mack campaign SC0432) was reported by Mack Trucks, Inc. on November 3, 2021, with 79 vehicles potentially affected (per NHTSA). NHTSA's record lists the Mack GRANITE (GR) and Mack LR for the 2021 model year. Owners were notified on December 10, 2021, per NHTSA.

Updated daily from NHTSA's recall files

Is my vehicle included?

This page lists, by model year, the vehicles NHTSA's recall record names for campaign 21V856000 in the model years try.vin imports (1995 and later); NHTSA's own record can list more. A model year on the list doesn't mean every vehicle of that year is included, and some may already have been repaired.

To see whether a specific vehicle is included and still needs the repair, enter its VIN at nhtsa.gov/recalls.

Free VIN check: decode a VIN to see its year, make and model.

Key facts

NHTSA campaign
21V856000 (also written 21V-856 or 21V856)
Filed by
Mack Trucks, Inc.
Mack campaign number
SC0432
Report received
Potentially affected
79 vehicles (per NHTSA)
Component
Steering — Hydraulic Power Assist — Pump
Owners notified

Repair completion: 72.15% (latest rate the manufacturer reported to NHTSA; dataset updated October 21, 2026)

NHTSA cautions against comparing completion rates across recalls or manufacturers. How try.vin reads them.

Vehicles listed for this recall

NHTSA's recall record lists these vehicles for recall 21V856000. try.vin imports model years 1995 and later, so NHTSA's own list can be longer. Model years with a try.vin recall page link to it. Build dates are NHTSA's range for a model year (per NHTSA); a vehicle built in that range is not necessarily included.

Mack

All Mack recalls

NHTSA's recall notice

As NHTSA's recall record states it for campaign 21V856000.

Defect description

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.

Safety consequence

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

Manufacturer 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.

Sources

Official NHTSA notice for recall 21V856000

Campaign details come from NHTSA's recall files, which try.vin imports once a day. The plain-language subject and the completion rate come from the U.S. Department of Transportation's Recalls Data dataset. How try.vin reads recall data.