2021 Mack Granite (GR), 2021 Mack LR Recall: A machining defect may cause pressure to build in the power steering pump…
NHTSA campaign 21V856000 · Steering · filed Nov 3, 2021 · verified Jul 30, 2026
The defect
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.
The risk
A loss of power steering assist increases the risk of a crash.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →The fix — what to do
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.
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.
Affected vehicles
Related recalls
More Mack Granite (GR) recalls
- 2026 Mack Anthem (an) and 4 other models — Wheel lug nuts may loosen and allow the wheel to detach
- 2024–2025 Mack Granite (GR) — LED headlights may fail
- 2019–2025 Mack Anthem (an) and 4 other models — Seat belt anchorage bracket may be improperly welded
- 2025 Mack Anthem (an) and 1 other model — Power cables may have been improperly routed, which can…
- 2020–2025 Mack Anthem (an) and 4 other models — Electrical noise and low signal to the power line carrier…
Other campaigns involving Mack vehicles
Source: NHTSA recall database, campaign 21V856000 (manufacturer number SC0432). Data last verified Jul 30, 2026.