Vehicle recall 21V233000 · April 1, 2021
Mack Anthem (an), Granite (gr) and 4 more models
The vehicles may not stay in their lane at certain speeds.
Source: NHTSA data as of September 22, 2026. Last refreshed Sep 23, 2026, 2:43 AM UTC.
- Summary
- 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."
- Consequence
- A vehicle that drifts out of its lane increases the risk of a crash.
- Remedy
- 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.
- 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.safercar.gov.
Recall details
- NHTSA campaign
- 21V233000
- Reported to NHTSA
- April 1, 2021
- Filed by
- Mack Trucks, Inc.
- Manufacturer campaign
- SC0423
- Owner notification
- April 21, 2021
- Vehicles potentially affected
- 557
- Initiated by
- the manufacturer
- Components
- Electronic stability control (ESC) › Control module › Software
Vehicles covered
As listed by NHTSA. A recall usually covers only some vehicles of each model and year, often a production date range.
- Mack Anthem (an) (2018-2022): 2022, 2021, 2020, 2019, 2018
- Mack Granite (gr) (2018-2022): 2022, 2021, 2020, 2019, 2018
- Mack Granite (gu) (2018-2022): 2022, 2021, 2020, 2019, 2018
- Mack Pinnacle (chu) (2018-2022): 2022, 2021, 2020, 2019, 2018
- Mack Pinnacle (cxu) (2018-2022): 2022, 2021, 2020, 2019, 2018
- Mack Pinnacle (PI/PN) (2018-2022): 2022, 2021, 2020, 2019, 2018
Has your Mack been repaired?
Recalls here come from NHTSA’s records for the model and year. Not every vehicle of a model is included in every recall, and this site can’t see whether a repair has been done. Only a VIN lookup can tell you that.
NHTSA’s VIN search doesn’t show recalls that were already repaired, recalls more than 15 years old, or some small manufacturers’ recalls. A Mack dealer can also check your VIN. Recall repairs are free.