2023 Mack MD
Safety record from NHTSA: recalls, owner complaints, investigations and service bulletins.
Have the VIN?
These records cover every 2023 Mack MD. To see whether one car still needs a recall repair, decode its VIN or check it with NHTSA.
Recalls
2 recalls name the 2023 Mack MD. Newest first.
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…
Risk and remedy
Risk
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 be searchable on NHTSA.gov beginning October 13, 2025.
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 and remedy
Risk
An unexpected engine shut down can increase the risk of a crash.
Remedy
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.
Owner complaints
1 complaints
What owners report most
Latest complaints
- Engine · Fuel/propulsion system · 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…
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 fragments throughout. (3) The transmission control unit wiring (circuits 143/123) reversed at the factory. The DEF sensor in the same aftertreatment system also failed back in Dec 2023, 14 months before the DPF symptoms — proving a system-wide defect. All failed components and repair invoices are available for inspection upon request. SAFETY RISK: After the dealer declared repairs complete, the truck was driven under 10 miles when the engine entered SEVERE DERATE (limp) mode WITHOUT WARNING, with four alerts firing at once including aftertreatment and transmission failures. Sudden, drastic power loss on a heavy commercial truck in live traffic is extremely dangerous — it can leave the vehicle unable to maintain highway speed, risking a collision with surrounding vehicles. The dealer released the truck in this hazardous state with no warning. CONFIRMED BY MULTIPLE SHOPS: Yes. The problem was reproduced and confirmed repeatedly — by the authorized dealer, by an independent transmission shop, and at final repair. The fault returned within 30 minutes on one visit and within 10 miles on another. INSPECTED BY: The authorized dealer and an independent service center inspected the vehicle and failed components. Documentation is available. WARNING SIGNS: Yes. Warning lamps appeared from the very first visit in Feb 2025 — transmission code P071A and high soot codes 1981/1922. They persisted for NINE MONTHS without proper repair, until the transmission catastrophically failed in Nov 2025. The vehicle was out of service over 45 days.
Service bulletins
Technical service bulletins and other communications the manufacturer sent dealers about this vehicle. Ask a dealer for the full document by its number.
- 11010857Vehicles may present with oil leak coming from the clutch/flywheel housing and observation of burned clutch smell or clutch slipping. These symptoms can be mistaken as a crankshaft rear main seal leak, when the actual cause is the crankshaft adaptor O-ring.
- 11008366CBR: To correct the MID136 SID 66 FMI 7 fault code the latest Bendix VCP fi le will need to be downloaded.
- 11005410CBR: Telematics Gateway (TGW) Connect Ability Issues
- 10253807CBR: Turbo Compound (TC) Hot Side Noise, Diagnostic Information.
- 10253804CBR: Equipped With An Automated Manual Transmission Model D or F ( AMT-D, AMT-F, mDrive) Missing X1 Value In VDA And Default Settings Guidelines, ParameterP1AOB; Fault Code P1052-54, Error 40,Or Error 18 Encountered During Clutch Or Tran.
- 10251330CBR - Diagnostic Trouble Code (DTC) P107471 - AMT-F
- 10249557TSB: 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.
- 10249556CBR: Mack Medium Duty (MMD) Rear Suspension Bump Stop Bending
- 10249553CBR: TGW Will Not Connect After SIM Card Replacement
- 10249551CBR: Frame Or Cab Lean
- 10246086TSB: Mack Trucks now offer an improved HD Inter-Axle Through Shaft for the CRD 125, 150, 180, and 200 family carriers. The new HD shaft went into production on January 23rd, 2023 for 2.54 - 3.50 axle ratios and April 1st, 2023 for 3.56 - 3.98 ratios. The new HD through shaft is an upgrade over the current standard shaft and can now be used as a replacement part instead of the standard shaft. The new HD shaft has a new design to increase strength, longevity and life over the standard shaft.
- 10243456CBR: Mack Chassis - Medium Duty - Front Bumper License Plate Mounting Holes
- 10243453TSB: Aftertreatment Diesel Exhaust Fluid (DEF) Tank, Level Sensor, Replacement
- 10243452TSB: Aftertreatment Diesel Exhaust Fluid (DEF) Tank, Level Sensor, Replacement
- 10241946TSB: Barksdale Leveling Valve, Leak Test
- 10240231CBR: Programming Failure - Chassis With Cummins Engine And An Allison Transmission
- 10237342CBR: Diagnostic Trouble Code (DTC) P215A-64, Fault Code SPN 84 FMI 19
- 10235493TSB: Hub Cap, Leaking
- 10233522New TSB- Hub cap leaking
- 10228637MMD Incorrect Fuel Tank Label
- 10228635MMD Fan Hub Bolt Torque
- 10225626Mack Chassis - Parker F-3 Hydraulic Pump Installation - Model Year (MY) 2023
- 10222608TSB-Charge Air Cooler t-clamp install.
- 10219423USE FOR NEW VEHICLES (US21+OBD22 Emissions) - Intermittent Diagnostic Trouble Codes U02A3, U029D, U029E
- 10215318Back Office Mack Chassis - Secondary Gauge Set Up - Model Year 2018 and Newer.
- 10215316DEF Level (UQLS) Sensor Troubleshooting Guide - US17+OBD16 Emissions and Newer.
- 10215315Programming Failure - Chassis With Cummins Engine And An Allison Transmission
- 10215314NOx Sensor Troubleshooting Guide - US10+OBD13 And Newer Emissions.
- 10215312(Back Office) - Cruise Control Inoperative After Updating Software VECU5 Without ESP Package (UESP).
- 10215309Aftertreatment Hydrocarbon Injector (AHI) Troubleshooting Guide - US10+OBD13 And Newer Emissions.
- 10215307Selective Catalytic Reduction (SCR) Muffler Troubleshooting Guide - US10+OBD13 And Newer Emissions.
- 10215305DEF Pump Troubleshooting Guide - US10+OBD13 And Newer Emissions.
- 10215296Vehicle Overspeed Warning Comes Active At A Lower Speed Than Expected; Vehicle Overspeed Warning In Driver Information Display (DID) - Model Year 2018 And Newer With New Style Instrument Cluster.
- 10215295Warranty Automated Manual Transmission ( AMT, I-Shift, mDrive ) Control Housing Assembly; Guidelines For Filing A Claim For Chassis Return Visit With Transmission Issues After A Repair Requiring Control Housing Removal And Reinstallation - US07 And N.
- 1021529411L, 13L, And 16L Engine Oil Analysis Specifications - US10 And Newer Emissions
- 10215291Premium Tech Tool (PTT) - Message For Data Mismatch, Product Configuration Mismatch; Instruction To Run An Accessory Kit Displayed When Attempting To Run Diagnostics For Diagnostic Trouble Codes (DTC) Or Programming - US10+OBD13 And Newer Emissions,
- 10215290(Back Office Only) - Engine Brake Vibration When In High Setting - 13L Engine With Variable Geometry Turbo ( VGT ) - US17 And Newer Emissions (Common Rail Fuel System).
- 10215289Automated Manual Transmission ( AMT ) I-Shift / mDRIVE - Ribbon Harness Replacement - Speed Sensor Bolts, Possible Fault Codes P1058 - 21 Or MID 130 PID 161 FMI 1
- 10215287US10 Emission Engines - Diagnostic Trouble Code ( DTC ) SPN 1231 FMI 9 Troubleshooting.
- 10215286Vehicles Equipped With An Automated Manual Transmission Model D or F ( AMT-D, AMT-F ) - Transmission Oil Leakage From Transmission Input Shaft Seal Or Output Shaft Seal - US10 And Newer Emissions, Common Model Years 2010 And Newer.
Every Mack MD model year
Bars are owner complaints, dots mark years with recalls. Select a year to open its report.