2018–2022 Mack Anthem (an), 2018–2022 Mack Granite (GR), 2018–2022 Mack Granite (gu) and 3 other models Recall: Vehicles may not stay in their lane at certain speeds
NHTSA campaign 21V233000 · Electronic Stability Control (esc) · filed Apr 1, 2021 · verified Jul 30, 2026
The defect
Mack Trucks, Inc. (Mack) is recalling certain 2018-2022 Anthem (AN), Granite (GR/GU), and Pinnacle (CHU/CXU/PI) vehicles equipped with "camelback" rear suspension and electronic stability control. The vehicles may not stay in their lane at certain speeds. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 136, "Electronic Stability Control Systems on Heavy Vehicles."
The risk
A vehicle that drifts out of its lane 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
Mack will notify owners, and dealers will reprogram the vehicle control units, free of charge. The recall began on April 21, 2021. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0423.
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.safercar.gov.
Affected vehicles
Related recalls
More Mack Anthem (an) recalls
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Other campaigns involving Mack vehicles
Source: NHTSA recall database, campaign 21V233000 (manufacturer number SC0423). Data last verified Jul 30, 2026.