2021 MACK MD — Problems, Recalls & Safety Data
N/A
Safety Rating
0
Owner Complaints
2
Recalls
6
Service Bulletins
0
Investigations
Overview of the 2021 MACK MD
The 2021 MACK MD has received a total of 0 safety complaints filed with the National Highway Traffic Safety Administration (NHTSA). There have been 2 recall campaigns affecting this vehicle, covering issues with SEAT BELTS:FRONT:ANCHORAGE, SERVICE BRAKES, HYDRAULIC:PEDALS AND LINKAGES. 6 technical service bulletins have been issued by Mack Trucks, Inc. for this model year.
Recalls for the 2021 MACK MD
NHTSA has recorded 2 recalls for the 2021 MACK MD, potentially affecting up to 18,664 vehicles.
Recall 25V666000 — SEAT BELTS:FRONT:ANCHORAGE
| 15,841 vehicles affected
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."
Consequence: An improperly welded seat belt anchorage bracket can detach during a crash, increasing the risk of injury.
Remedy: 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...
View full details →Recall 21V684000 — SERVICE BRAKES, HYDRAULIC:PEDALS AND LINKAGES
| 2,823 vehicles affected
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.
Consequence: An unsecured brake pedal can cause a loss of braking ability and increase the risk of a crash.
Remedy: 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...
View full details →Owner Complaints for the 2021 MACK MD
No complaints have been filed with NHTSA for the 2021 MACK MD.
Safety Rating for the 2021 MACK MD
NHTSA has not yet tested the 2021 MACK MD in its New Car Assessment Program.
Technical Service Bulletins for the 2021 MACK MD
Mack Trucks, Inc. has issued 6 technical service bulletins (TSBs) for the 2021 MACK MD. TSBs are notices sent by manufacturers to their dealers describing a known issue and the recommended repair procedure.
CBR-2342 202401 — SUSPENSION
CBR: Mack Medium Duty (MMD) Rear Suspension Bump Stop Bending
M-834-001 202401 — ELECTRICAL SYSTEM
TSB: Some Mack MMD trucks could experience an issue with the ignition lock cylinder sticking. Trucks that experience a sticking lock cylinder could have a lock cylinder that becomes tight or sticks in the start position. If the above condition is found replace the ignition lock cylinder.
KC-2139 — FUEL SYSTEM, DIESEL
fuel in the oil inspection
S7646 — STEERING
MMD Steering Column Bracket Hardware
SNM21-006 — ELECTRICAL SYSTEM:SOFTWARE
Remote Software Downloads
S7588 — EQUIPMENT
Mack Medium Duty Refrigerant Label Replacement
NHTSA Investigations for the 2021 MACK MD
There are no NHTSA defect investigations on record for this vehicle.
Other Model Years of the MACK MD
- 2020 MACK MD — 0 complaints
- 2021 MACK MD (current)
- 2022 MACK MD — 0 complaints
- 2023 MACK MD — 0 complaints
- 2024 MACK MD — 0 complaints
- 2025 MACK MD — 2 complaints
- 2026 MACK MD — 0 complaints
Other MACK Models
- MACK MACK — 35 total complaints
- MACK ANTHEM (AN) — 12 total complaints
- MACK CXU612 — 12 total complaints
- MACK CX613 — 10 total complaints
- MACK GRANITE (GR) — 10 total complaints
- MACK CH600 — 9 total complaints
- MACK GU — 9 total complaints
- MACK RD — 8 total complaints