AutoStatsIQ
Data through Oct 2026
Model yearDo not drive

2020 Mack MD

Body and fuel not decoded. Owner complaints on file from no date to no date.

Recalls (2)Complaints (0)Investigations (0)Bulletins (105)
Recall campaigns covering this model year219k vehicles or units across those campaigns
Owner complaints0Not enough peers on file
Severity indexNoneCrash, fire, injury or death per 100
First 24 months0Complaints in its first two years
Complaints over time

Complaints about the 2020 Mack MD by year filed

Owner complaints about this model year, by the year they were filed with NHTSA.

No campaigns match these filters.Reset filters
Source: NHTSA ODI complaints file. The lighter column runs through October.
Components

Complaints by component

Owner complaints by component. Hover or focus a bar for the crash, fire, injury or death count.

No campaigns match these filters.Reset filters
Source: NHTSA ODI complaints file. A complaint can name more than one component; it is counted under the first.
Recalls

2 recall campaigns cover the 2020 Mack MD

Check a specific vehicle by VIN on NHTSA's site: a campaign may cover only part of a model year's production.

Recall campaigns for the 2020 Mack MD
CampaignFiledSubjectComponentVehiclesRemedy
25V-666Oct 6, 2025Seat belt anchorage bracket may be improperly weldedSeat belts15,841Repair or modification
21V-684Sep 1, 2021Cotter pin that retains the brake pedal clevis pin may not have been properly installed, which could result in an unsecured brake pedalDo not driveBrakes2,823Repair or modification
Source: NHTSA ODI recalls file.
Look up a VIN at NHTSA
Owner complaints

What owners reported about the 2020 Mack MD

The full text of every complaint filed with NHTSA about this model year, newest first. Complaints are filed by owners and are not verified by NHTSA; NHTSA removes personal details before publishing.

0 complaints on file.

    Source: NHTSA ODI complaints file.
    Investigations

    NHTSA has not opened an investigation on this model year

    Source: NHTSA ODI investigations file.
    All investigations
    Service bulletins

    105 manufacturer communications cover this model year

    Technical service bulletins and other notices the manufacturer sent to dealers. A bulletin is not a recall; the 60 most recent are listed.

    • CBR 2573-1 202604 Apr 9, 2026 · Service Bulletin/Repair Instructions
      CBR - Mack Chassis - Through Shaft Bearing Retainer Breakage On Mack Carriers.
    • CBR 2362-3 202604 Apr 9, 2026 · Service Bulletin/Repair Instructions
      CBR - Mack Carrier Nut Adhesive Change.
    • TSB M-432-002A 032026 Mar 12, 2026 · Service Bulletin/Repair Instructions
      TSB - Cable, Gear Selector, Replacement
    • CBR 2107-22 202601 Jan 7, 2026 · 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)).
    • CBR 407 072025 Jul 17, 2025 · Service Bulletin/Repair Instructions
      CBR - To correct the MID136 SID 66 FMI 7 fault code the latest Bendix VCP file will need to downloaded.
    • CBR 2488 072025 Jul 28, 2025 · 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.
    • CBR 2107-21 202505 May 27, 2025 · Service Bulletin/Repair Instructions
      Mack DEF Level (UQLS) Sensor Troubleshooting Guide - US17+OBD16 Emissions and Newer
    • CBR 445- 11 202505 May 1, 2025 · Service Bulletin/Repair Instructions
      Vehicles Equipped With a Common Rail Fuel System - Aftermarket Secondary Fuel Filters, Important Information On Approved Filters - US17+OBD16 toUS21+OBD23
    • CBR-561 202503 Mar 6, 2025 · Service Bulletin/Repair Instructions
      If oil dilution is suspected refer to the applicable CBR solution below: ∙ CBR-659􀁡Mack Chassis - Oil Diluted With Fuel; Fuel In Oil, Diagnostic Information - All Emissions, All Model Years
    • CBR-2016 202412 Dec 3, 2024 · Service Bulletin/Repair Instructions
      Frame lean can be caused by several seemingly isolated possibilities. The two most common are suspension and frame assembly issues.
    • CBR-997 202411 Nov 14, 2024 · Service Bulletin/Repair Instructions
      Vehicles 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.
    • CBR-407 202409 Sep 13, 2024 · Service Bulletin/Repair Instructions
      CBR: To correct the MID136 SID 66 FMI 7 fault code the latest Bendix VCP fi le will need to be downloaded.
    • CBR-2350 202407 Jul 2, 2024 · Service Bulletin/Repair Instructions
      CBR: Telematics Gateway (TGW) Connect Ability Issues
    • CBR-2013 202404 Apr 2, 2024 · Service Bulletin/Repair Instructions
      CBR: Turbo Compound (TC) Hot Side Noise, Diagnostic Information.
    • CBR-1008 202404 Apr 22, 2024 · Service Bulletin/Repair Instructions
      CBR: 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.
    • M-834-001 202401 Jan 1, 2024 · Service Bulletin/Repair Instructions
      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 re…
    • CBR-2333 202401 Jan 18, 2024 · Service Bulletin/Repair Instructions
      CBR: TGW Will Not Connect After SIM Card Replacement
    • CBR-2016 202401 Jan 17, 2024 · Service Bulletin/Repair Instructions
      CBR: Frame Or Cab Lean
    • M-465-001 202311 Nov 7, 2023 · Service Bulletin/Repair Instructions
      TSB: 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 ne…
    • M-258-014 202309 Sep 5, 2023 · Service Bulletin/Repair Instructions
      TSB: Aftertreatment Diesel Exhaust Fluid (DEF) Tank, Level Sensor, Replacement
    • M-258-012 202309 Sep 5, 2023 · Service Bulletin/Repair Instructions
      TSB: Aftertreatment Diesel Exhaust Fluid (DEF) Tank, Level Sensor, Replacement
    • M728-005A 202308 Aug 14, 2023 · Service Bulletin/Repair Instructions
      TSB: Barksdale Leveling Valve, Leak Test
    • CBR-2112 202307 Jul 24, 2023 · Service Bulletin/Repair Instructions
      CBR: Programming Failure - Chassis With Cummins Engine And An Allison Transmission
    • KC-474-Ver5 May 2, 2023 · Service Bulletin/Repair Instructions
      CBR: Diagnostic Trouble Code (DTC) P215A-64, Fault Code SPN 84 FMI 19
    • M-265-002 Sep 22, 2022 · Service Bulletin/Repair Instructions
      TSB-Charge Air Cooler t-clamp install.
    • KC-2139 Aug 29, 2022 · Service Bulletin/Repair Instructions
      fuel in the oil inspection
    • KC-733 Jun 6, 2022 · Service Bulletin/Repair Instructions
      Back Office Mack Chassis - Secondary Gauge Set Up - Model Year 2018 and Newer.
    • KC-2107 Jun 3, 2022 · Service Bulletin/Repair Instructions
      DEF Level (UQLS) Sensor Troubleshooting Guide - US17+OBD16 Emissions and Newer.
    • KC-2112 Jun 21, 2022 · Service Bulletin/Repair Instructions
      Programming Failure - Chassis With Cummins Engine And An Allison Transmission
    • KC-2116 Jun 3, 2022 · Service Bulletin/Repair Instructions
      NOx Sensor Troubleshooting Guide - US10+OBD13 And Newer Emissions.
    • KC-2143 Jun 21, 2022 · Service Bulletin/Repair Instructions
      (Back Office) - Cruise Control Inoperative After Updating Software VECU5 Without ESP Package (UESP).
    • KC-2157 Jun 3, 2022 · Service Bulletin/Repair Instructions
      Aftertreatment Hydrocarbon Injector (AHI) Troubleshooting Guide - US10+OBD13 And Newer Emissions.
    • KC-2158 Jun 3, 2022 · Service Bulletin/Repair Instructions
      Selective Catalytic Reduction (SCR) Muffler Troubleshooting Guide - US10+OBD13 And Newer Emissions.
    • KC-2165 Jun 3, 2022 · Service Bulletin/Repair Instructions
      DEF Pump Troubleshooting Guide - US10+OBD13 And Newer Emissions.
    • KC-399 Jun 17, 2022 · Service Bulletin/Repair Instructions
      Vehicle 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.
    • KC-405 Jun 21, 2022 · Service Bulletin/Repair Instructions
      Warranty 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.
    • KC-561 Jul 5, 2022 · Service Bulletin/Repair Instructions
      11L, 13L, And 16L Engine Oil Analysis Specifications - US10 And Newer Emissions
    • KC-735 Jun 6, 2022 · Service Bulletin/Repair Instructions
      Premium 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,
    • KC-736 Jun 6, 2022 · Service Bulletin/Repair Instructions
      (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).
    • KC-745 Jun 22, 2022 · Service Bulletin/Repair Instructions
      Automated Manual Transmission ( AMT ) I-Shift / mDRIVE - Ribbon Harness Replacement - Speed Sensor Bolts, Possible Fault Codes P1058 - 21 Or MID 130 PID 161 FMI 1
    • KC-750 Jun 28, 2022 · Service Bulletin/Repair Instructions
      US10 Emission Engines - Diagnostic Trouble Code ( DTC ) SPN 1231 FMI 9 Troubleshooting.
    • KC-751 Jun 28, 2022 · Service Bulletin/Repair Instructions
      Vehicles 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.
    • KC-663 May 18, 2022 · Service Bulletin/Repair Instructions
      Emcon (Spark Assist) Engine Aftertreatment System Troubleshooting Check Sheet - US07 Emissions
    • KC-644 May 17, 2022 · Service Bulletin/Repair Instructions
      Manual Compression Test Adapter For Engines With Stainless Steel Injector Sleeves (Conical Tip Injectors) - US07 And Newer Emissions, Model Year 2008 And Newer
    • KC-627 May 9, 2022 · Service Bulletin/Repair Instructions
      Premium Tech Tool ( PTT ) Training Materials And Support Tools
    • KC-2172 May 16, 2022 · Service Bulletin/Repair Instructions
      No Start Condition After Over The Air Programing - VECU5 No Start "Safe State"
    • KC-2171 May 26, 2022 · Service Bulletin/Repair Instructions
      Temperature Sensor Troubleshooting Guide - US10+OBD13 And Newer
    • KC-2170 May 16, 2022 · Service Bulletin/Repair Instructions
      Electronically Controlled Suspension (ECS) Losing Air Pressure
    • KC-2169 May 16, 2022 · Service Bulletin/Repair Instructions
      Low Voltage Disconnect (LVD), Function Description
    • KC-2165 May 26, 2022 · Service Bulletin/Repair Instructions
      DEF Pump Troubleshooting Guide - US10+OBD13 And Newer Emissions
    • KC-2161 May 13, 2022 · Service Bulletin/Repair Instructions
      DEF Pump Cycling periodically Hours After Key Off
    • KC-2158 May 26, 2022 · Service Bulletin/Repair Instructions
      Selective Catalytic Reduction (SCR) Muffler Troubleshooting Guide - US10+OBD13 And Newer Emissions
    • KC-2157 May 26, 2022 · Service Bulletin/Repair Instructions
      Aftertreatment Hydrocarbon Injector (AHI) Troubleshooting Guide - US10+OBD13 And Newer Emissions
    • KC-2131 May 26, 2022 · Service Bulletin/Repair Instructions
      USE FOR NEW VEHICLES (US21+OBD22 Emissions) - Intermittent Diagnostic Trouble Codes U02A3, U029D, U029E
    • KC-2116 May 26, 2022 · Service Bulletin/Repair Instructions
      NOx Sensor Troubleshooting Guide - US10+OBD13 And Newer Emissions
    • KC-626 May 9, 2022 · Service Bulletin/Repair Instructions
      Mack Chassis - Vehicles Equipped With An Automated Manual Transmission Model F ( AMT-F, mDrive ), Premium Tech Tool ( PTT ) Gearbox Calibration Failure; Gearbox Calibration Operation Stops And Fails At 33% When Run With Transmission Removed
    • KC-633 May 13, 2022 · Service Bulletin/Repair Instructions
      Mack Chassis - Front Hub With Unit-Bearings ( Unitized Wheel Bearings ), Inspection Information And Guidelines - Commonly Model Year 2008 And Newer
    • KC-648 May 17, 2022 · Service Bulletin/Repair Instructions
      Mack - PTO Pump Speed Calculator
    • KC-651 May 17, 2022 · Service Bulletin/Repair Instructions
      Mack Dealer Support Communication - Selecting The Proper SR Area For Creating An eService
    • KC-652 May 17, 2022 · Service Bulletin/Repair Instructions
      Mack Low Oil Pressure Diagnostic Process For 11 Liter Engines
    Source: NHTSA manufacturer communications files.
    About service bulletins