Model year

2021 Mack LR

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

Recall campaigns covering this model year35,847 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 2021 Mack LR 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

3 recall campaigns cover the 2021 Mack LR

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 2021 Mack LR
CampaignFiledSubjectComponentVehiclesRemedy
22V-401Jun 7, 2022Steering gears may have been assembled incorrectly, which can cause the gear to fractureSteering5,644Part replacement
21V-856Nov 3, 2021Machining defect may cause pressure to build in the power steering pump and break the shaft seal, resulting in a loss of power steering assistSteering79Part replacement
21V-573Jul 27, 2021Rear drive axle may have the incorrect type of brake cam installed, which could result in inoperative rear axle brakesBrakes124Part replacement
Source: NHTSA ODI recalls file.
Owner complaints

What owners reported about the 2021 Mack LR

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.
    Service bulletins

    163 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.
    • CBR 2712-7 032026 Mar 19, 2026 · Service Bulletin/Repair Instructions
      CBR - No Start Condition After Over the Air Programing.
    • 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 2171-11 202511 Nov 22, 2025 · Service Bulletin/Repair Instructions
      CBR - Mack Temperature Sensor Troubleshooting Guide
    • CBR 2515-1 102025 Oct 20, 2025 · Service Bulletin/Repair Instructions
      CBR - Hard Steering Due to Steering Column Miter Box Corrosion – Inspection and Replacement Procedure
    • CBR 2172-5 082025 Aug 22, 2025 · 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.
    • 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 901-5 202505 May 13, 2025 · Service Bulletin/Repair Instructions
      Remote Control Central Door Lock, Programming; Key Fob Cannot Be Programmed Or Does Not Work After Programming - Model Year 2018 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 170-8 202505 May 28, 2025 · Service Bulletin/Repair Instructions
      Inactive Code P25AE00 Being Generated After A Hard Pull And A Momentary Drop In Engine Oil Pressure (Low Oil Pressure) (Possible Related Codes - SPN4811 , SPN 100 , PID 100)
    • 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-2263 202410 Oct 31, 2024 · Service Bulletin/Repair Instructions
      CBR - Mack Chassis - Timing Gear Plate Repair
    • CBR-731 202409 Sep 16, 2024 · Service Bulletin/Repair Instructions
      CBR: Automated Manual Transmission (AMT) Model D or F (mDrive and I-Shift, 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
    • CBR-570 202409 Sep 20, 2024 · Service Bulletin/Repair Instructions
      CBR: US17 GHG Common Rail Fuel System Component Electrical Faults - Model Year 2017 To 2024
    • CBR-471 202409 Sep 10, 2024 · Service Bulletin/Repair Instructions
      CBR: The procedure to eliminate the Mack Chassis "Air Restriction Light On" seen in the cluster is to confirm that the parameter YYT is set to "Enable" with Premium Tech Tool.
    • 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-2391 202408 Aug 6, 2024 · Service Bulletin/Repair Instructions
      CBR: Diagnostic Trouble Code (DTC) U010187- Lost Communication With TECU
    • CBR-561 202408 Aug 13, 2024 · Service Bulletin/Repair Instructions
      CBR: 11L, 13L, And 16L Engine Oil Analysis Specifications - US10 And Newer Emissions
    • CBR-523 202408 Aug 13, 2024 · Service Bulletin/Repair Instructions
      CBR: Overhead Wear Overview - Model Year2018 To Current (Common Rail Fuel System ONLY)
    • CBR-2350 202407 Jul 2, 2024 · Service Bulletin/Repair Instructions
      CBR: Telematics Gateway (TGW) Connect Ability Issues
    • CBR-2383 202406 Jun 19, 2024 · Service Bulletin/Repair Instructions
      CBR - Accelerator Pedal: Inspection Instructions
    • CBR-2139 202405 May 2, 2024 · Service Bulletin/Repair Instructions
      CBR: Vehicles built with an 11 liter engine may experience a complaint of excessive fuel in the oil. It is possible that the source of the fuel is the rear fuel galley plug in the cylinder head. A new and improved fuel galley plug has been developed to reso…
    • 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.
    • CBR-2139 202403 Mar 1, 2024 · Service Bulletin/Repair Instructions
      CBR: Vehicles built with an 11 liter engine may experience a complaint of excessive fuel in the oil. It is possible that the source of the fuel is the rear fuel galley plug in the cylinder head.
    • CBR-2350 202402 Feb 21, 2024 · Service Bulletin/Repair Instructions
      CBR -Telematics Gateway (TGW) Connect Ability Issues
    • CBR-2347 202402 Feb 16, 2024 · Service Bulletin/Repair Instructions
      CBR - Active "Set Park Brake" Message On Drivers Information Display (DID).
    • CBR-202 202402 Feb 16, 2024 · Service Bulletin/Repair Instructions
      CBR - Automated Manual Transmission ( AMT ) Flywheel Pilot Bearing Wear On Input Shaft.
    • CBR-2014 202402 Feb 16, 2024 · Service Bulletin/Repair Instructions
      CBR - Driveline Noise, Suspension Ride Height Too High, Suspension Will Not Exhaust - Chassis Built 2016w01 And Newer.
    • CBR-2333 202401 Jan 18, 2024 · Service Bulletin/Repair Instructions
      CBR: TGW Will Not Connect After SIM Card Replacement
    • CBR-2320 202312 Dec 1, 2023 · Service Bulletin/Repair Instructions
      CBR: For vehicles equipped with an 11L engine, the plastic saddle bracket holding the a/c line on the left side of the engine may move excessively and rub the area where it secures the line.
    • 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…
    • CBR-399 202310 Oct 19, 2023 · Service Bulletin/Repair Instructions
      CBR: 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
    • M-258-014 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-2131 202308 Aug 14, 2023 · Service Bulletin/Repair Instructions
      CBR: Intermittent Diagnostic Trouble Codes U02A3,U029D, U029E - USE FOR NEW VEHICLES (US21+OBD22 Emissions)
    • CBR-2112 202307 Jul 24, 2023 · Service Bulletin/Repair Instructions
      CBR: Programming Failure - Chassis With Cummins Engine And An Allison Transmission
    • CBR-2303 202307 Jul 1, 2023 · Service Bulletin/Repair Instructions
      CBR: Mack DEF Dosing Valve Diagnostic Trouble Codes (DTC) P202D00, P208E00, P103B00 - US10+OBD13 And Newer Emissions
    • KC-2289 Jun 27, 2023 · Service Bulletin/Repair Instructions
      Diagnostic Trouble Code (DTC) P103200: Particulate Matter Sensor Removed from Exhaust - US21+OBD22 Emissions
    • KC-2094 Rev 3 Jun 22, 2023 · Service Bulletin/Repair Instructions
      Infotainment System - Volume Drop During A Phone Call, Phone Connected Via Bluetooth
    • KC-2292 Jun 13, 2023 · Service Bulletin/Repair Instructions
      Vehicles Equipped With Chalmers Suspension - Frame Bracket Hardware Loose or Interfering
    • KC-2043 Rev 4 Jun 6, 2023 · Service Bulletin/Repair Instructions
      Engine Control Module (EMS) Software (MSW) Information - Improvement List, Through June 2023 - US21+OBD2020 Emissions
    • KC-2116 Rev 9 Jun 16, 2023 · Service Bulletin/Repair Instructions
      Mack NOx Sensor Troubleshooting Guide - US10+OBD13 And Newer Emissions
    • KC-2116 Rev 8 Jun 5, 2023 · Service Bulletin/Repair Instructions
      Mack NOx Sensor Troubleshooting Guide - US10+OBD13 And Newer Emissions
    • KC-2158 Rev 6 Jun 5, 2023 · Service Bulletin/Repair Instructions
      CBR - Mack Selective Catalytic Reduction (SCR) Muffler Troubleshooting Guide - US10+OBD13 And Newer Emissions
    • SLM23-005 May 31, 2023 · Service Bulletin/Repair Instructions
      Service Literature Published and Released in May, 2023
    • KC-2050 May 30, 2023 · Service Bulletin/Repair Instructions
      CBR: Diagnostic Trouble Code (DTC) P225C00 : NOx1 Sensor Stuck High - US17+OBD2019 And Newer Emissions
    • KC-331-Ver6 May 22, 2023 · Service Bulletin/Repair Instructions
      CBR: Model Year 2017 to Current - Fuel Filter Change ( Primary And Secondary ) For The EM - USA17 Emission Engines
    • KC-503-Ver3 May 17, 2023 · Service Bulletin/Repair Instructions
      CBR: Automated Manual Transmission ( AMT ) -Transmission Electronic Control Unit ( TECU ) MID130 PSID 29 FMI 7 /P10AE81 Fault Codes Being Generated
    • KC-2229-Ver2 May 10, 2023 · Service Bulletin/Repair Instructions
      CBR: Automated Manual Transmission (AMT) Transmission Kickdown Mode
    • KC-474-Ver5 May 2, 2023 · Service Bulletin/Repair Instructions
      CBR: Diagnostic Trouble Code (DTC) P215A-64, Fault Code SPN 84 FMI 19
    • KC-2012-Ver3 May 18, 2023 · Service Bulletin/Repair Instructions
      CBR: SNM 20-005 - HD Disc Brake Rotor Upgrade
    • KC-2263-Ver5 May 16, 2023 · Service Bulletin/Repair Instructions
      CBR: Timing Gear Plate Repair. This solution provides supplementary information to be used when installing a Timing Gear Plate with Integrated Seal.
    • M-773-005a Apr 18, 2023 · Service Bulletin/Repair Instructions
      TSB: Hub Cap, Leaking
    • KC-2264 Apr 20, 2023 · Service Bulletin/Repair Instructions
      CBR: Mack Chassis - Allison Reduced Engine Load At A Stop (RELS) Diagnostic Trouble Code P071a Or P07ce - GR,TE,LR Models - Non-Split/Drop Box PTO
    Source: NHTSA manufacturer communications files.