2020 Mack Md problems, complaints & recalls
Safety recalls (2)
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.
Service Brakes, Hydraulic:pedals And Linkages 2021-09-01 · campaign 21V684000 · 2,823 vehicles ⚠DO NOT DRIVE
Defect: Mack Trucks, Inc. (Mack) is recalling certain 2020-2022 Mack MD vehicles. The cotter pin that retains the brake pedal clevis pin may not have been properly installed, which could result in an unsecured brake pedal.
Risk: An unsecured brake pedal can cause a loss of braking ability and increase the risk of a crash.
Fix: Owners are advised to not drive their vehicles until the remedy has been performed. Dealers will inspect the cotter pin installation and repair it as necessary, free of charge. Owner notification letters were mailed on September 13, 2021. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0429.
Service bulletins (105)
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.
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.
Power Train 2026-03-12 · TSB M-432-002A 032026 · Service Bulletin/Repair Instructions
tsb - cable, gear selector, replacement
Engine 2026-01-07 · CBR 2107-22 202601 · Service Bulletin/Repair Instructions
cbr - mack def level (uqls) sensor troubleshooting guide - us17+obd16 emissions to us22+obd2023 (does not apply to an(4) and pr(4)).
Electrical System 2025-07-28 · CBR 2488 072025 · Service Bulletin/Repair Instructions
cbr - a significant gps reporting issue is affecting fleet operations, with trucks maintaining back-office communication but failing to transmit gps location data.
Service Brakes 2025-07-17 · CBR 407 072025 · Service Bulletin/Repair Instructions
cbr - to correct the mid136 sid 66 fmi 7 fault code the latest bendix vcp file will need to downloaded.
Showing the 6 most recent of 105 bulletins. Search all of them free at nhtsa.gov.
What owners report
No detailed complaint narratives on file.
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.