2023 Mack Md problems, complaints & recalls
Most-reported problem areas: Power Train (1)
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.
Engine And Engine Cooling:engine:engine Control Module (Ecu/Ecm) 2022-08-09 · campaign 22V606000 · 150 vehicles
Defect: Mack Trucks, Inc. (Mack) is recalling certain 2023 MD6/7 trucks. The engine control module (ECM) may experience an internal short-circuit, which can result in an unexpected engine shut down.
Risk: An unexpected engine shut down can increase the risk of a crash.
Fix: Cummins will replace the ECM, free of charge. Owner notification letters were mailed on September 27, 2022. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0438.
Service bulletins (69)
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.
Unknown Or Other 2026-03-19 · CBR 2712-7 032026 · Service Bulletin/Repair Instructions
cbr - no start condition after over the air programing.
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 2025-08-22 · CBR 2172-5 082025 · Service Bulletin/Repair Instructions
cbr - when an ota (over-the-air) job starts to program the vecu blocks the starter relay out, if the job ends in a critical failure, the vehicle will remain in safe state.
Showing the 6 most recent of 69 bulletins. Search all of them free at nhtsa.gov.
What owners report
2026-06-17 · Power Train“ components that failed: multiple systems failed in a connected chain. (1) the dpf aftertreatment differential pressure sensor — a confirmed manufacturing defect per cummins recall t7186/t7187 (jan 2026). (2) the allison automatic transmission — catastrophic internal failure: torque converter destroyed, flexplate warped and cracked, metal fragment…”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.