2021 Mack Anthem (An) problems, complaints & recalls
Most-reported problem areas: Lane Departure: Assist (1) · Fuel/Propulsion System (1)
Safety recalls (5)
Seat Belts:front:anchorage 2025-10-06 · campaign 25V666000 · 15,841 vehicles
Defect: Mack Trucks, Inc. (Mack) is recalling certain 2020-2025 Mack MD, 2019-2025 Anthem, Granite, 2024 MD Electric, and 2025 Pinnacle trucks equipped with a passenger bench seat. The seat belt anchorage bracket may be improperly welded. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 210, "Seat Belt Assembly Anchorages."
Risk: An improperly welded seat belt anchorage bracket can detach during a crash, increasing the risk of injury.
Fix: Dealers will install a reinforcement plate, free of charge. Owner letters were mailed January 21, 2026. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0485. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning October 13, 2025.
Electrical System:software 2024-10-23 · campaign 24V792000 · 59,338 vehicles
Defect: Mack Trucks, Inc. (Mack) is recalling certain 2020-2025 Anthem, Granite, TerraPro and Pinnacle vehicles, equipped with Bendix EC80 Advanced Electronic Control Units (ECU). Electrical noise and low signal to the power line carrier may cause the ECU to incorrectly process commands or stop working.
Risk: Safety systems that depend on the ECU (Automatic Traction Control, ABS, Electronic Stability Control, Active Cruise Control, and Collison Mitigation System) may have diminished or lost functionality, increasing the risk of a crash.
Fix: Dealers will reprogram the ECU software, free of charge. Owner notification letters were mailed December 9, 2024. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0472.
Steering 2022-06-07 · campaign 22V401000 · 5,644 vehicles
Defect: Mack Trucks, Inc. (Mack) is recalling certain 2021-22 Granite, Anthem, LR, Pinnacle, and Terrapro tractor trailers. The steering gears may have been assembled incorrectly, which can cause the gear to fracture.
Risk: A fractured steering gear can cause a loss of steering control, increasing the risk of a crash.
Fix: Dealers will replace the steering gear, free of charge. Owner notification letters were mailed on July 29, 2022. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0437.
Wheels:hub 2021-06-02 · campaign 21V416000 · 307 vehicles
Defect: Mack Trucks, Inc. (Mack) is recalling certain 2021-2022 Anthem, Granite, and Pinnacle vehicles. The hubcap compression spring can cause the hubcap to separate.
Risk: A separated hubcap can create a road hazard, increasing the risk of a crash.
Fix: Dealers will remove the hubcap, free of charge. Owner notification letters were mailed June 30, 2021. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0425.
Electronic Stability Control (Esc):control Module:software 2021-04-01 · campaign 21V233000 · 557 vehicles
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."
Risk: A vehicle that drifts out of its lane increases the risk of a crash.
Fix: 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.
Service bulletins (227)
Technical service bulletins are repair instructions manufacturers send dealers for known issues. Unlike recalls, the fix is not automatically free — but naming the bulletin at the service desk can save diagnosis time and support goodwill repairs.
Electrical System 2026-08-10 · CBR 159 202608 · Service Bulletin/Repair Instructions
mack trucks equipped with a cummins engine - engine preheat icon does not illuminate in the instrument cluster (ic) during engine pre-heat (intake air heater) operation - vehicles with 2018instrument cluster update, model year2018 and newer
Unknown Or Other 2026-04-30 · CBR 2575-1 202604 · Service Bulletin/Repair Instructions
cbr - mack chassis - dash panel cracking at mounting to biw.
Power Train 2026-04-09 · CBR 2573-1 202604 · Service Bulletin/Repair Instructions
cbr - mack chassis - through shaft bearing retainer breakage on mack carriers.
Power Train 2026-04-09 · CBR 2362-3 202604 · Service Bulletin/Repair Instructions
cbr - mack carrier nut adhesive change.
Unknown Or Other 2026-03-19 · CBR 2712-7 032026 · Service Bulletin/Repair Instructions
cbr - no start condition after over the air programing.
Engine 2026-03-02 · M0039 032026 · Emissions
emissions - ec0039 mst21 failure to detect p20ee - an, chu.
Showing the 6 most recent of 227 bulletins. Search all of them free at nhtsa.gov.
What owners report
2026-09-27 · Lane Departure: Assist · 💥 crash“driver 1 stated: “i was traveling in the right lane and going straight. the other truck was on the right shoulder. i was attempting to merge into the middle lane to provide additional space for the truck on the right shoulder. however, there was another vehicle in the middle lane, so i was unable to merge. i subsequently struck the truck that was s…”
2023-07-24 · Fuel/Propulsion System“the secondary fuel filter housing broke causing the truck to shut off while driving.…”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.