Model year

2021 Mack Anthem (AN)

Heavy truck, diesel, 6x4, built in United States. Owner complaints on file from Jul 24, 2023 to Sep 27, 2026.

Recall campaigns covering this model year582k vehicles or units across those campaigns
Owner complaints22.0 times the median 2021 heavy truck
Severity index50.02021 heavy trucks average 14.3
First 24 months0Complaints in its first two years
Complaints over time

Complaints about the 2021 Mack Anthem (AN) peaked in 2023, with 1 filed

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

00.250.50.75120231202420252026
Source: NHTSA ODI complaints file. The lighter column runs through October.
Components

50% of complaints about the 2021 Mack Anthem (AN) name back-over prevention

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

Back-over prevention
1
Fuel system
1
Driver assistance
1
Source: NHTSA ODI complaints file. A complaint can name more than one component; it is counted under the first.
Recalls

5 recall campaigns cover the 2021 Mack Anthem (AN)

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 Anthem (AN)
CampaignFiledSubjectComponentVehiclesRemedy
25V-666Oct 6, 2025Seat belt anchorage bracket may be improperly weldedSeat belts15,841Repair or modification
24V-792Oct 23, 2024Electrical noise and low signal to the power line carrier may cause the ECU to incorrectly process commands or stop workingElectrical system59,338Software update
22V-401Jun 7, 2022Steering gears may have been assembled incorrectly, which can cause the gear to fractureSteering5,644Part replacement
21V-416Jun 2, 2021Hubcap compression spring can cause the hubcap to separateWheels307Not stated
21V-233Apr 1, 2021Vehicles may not stay in their lane at certain speedsStability and traction control557Software update
Source: NHTSA ODI recalls file.
Owner complaints

What owners reported about the 2021 Mack Anthem (AN)

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.

2 complaints on file, page 1 of 1.

  1. Filed Sep 27, 2026Failure May 6, 2026Pawtucket, RIWarnings, AssistCrash2 killed

    Driver 1 stated: “I was traveling in the right lane and going straight. The other truck was on the right shoulder. I was attempting to merge into the middle lane to provide additional space for the truck on the right shoulder. However, there was another vehicle in the middle lane, so I was unable to merge. I subsequently struck the truck that was stopped on the right shoulder.” Driver 2 stated: “We were on the right shoulder because the truck was experiencing mechanical issues. We were then struck from behind.” Investigation Findings The investigation revealed that Vehicle 1 (V1) and Vehicle 2 (V2) were traveling on the New Jersey Turnpike (NJTP) near milepost 99.5 in Elizabeth County. Vehicle 2 was stopped on the right shoulder due to mechanical issues. Driver 1 failed to maintain proper directional control of Vehicle 1 and subsequently struck the rear of Vehicle 2, which was stopped on the shoulder. A passenger in Vehicle 2 complained of neck and back pain but declined medical attention at the scene. Both vehicles were towed from the scene by Highway Towing, AIS 208.

    NHTSA complaint 11767258
  2. Filed Jul 24, 2023Failure Jul 24, 2023Middle River, MDFuel/propulsion system

    The secondary fuel filter housing broke causing the truck to shut off while driving.

    NHTSA complaint 11534072
Source: NHTSA ODI complaints file.
Investigations

NHTSA has not opened an investigation on this model year

Source: NHTSA ODI investigations file.
Service bulletins

227 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 159 202608 Aug 10, 2026 · Service Bulletin/Repair Instructions
    Mack Trucks Equipped With A Cummins Engine - Engine Preheat Icon Does Not Illuminate In The Instrument Cluster (IC) During Engine Pre-heat (Intake Air Heater) Operation - Vehicles With 2018Instrument Cluster Update, Model Year2018 And Newer
  • CBR 2575-1 202604 Apr 30, 2026 · Service Bulletin/Repair Instructions
    CBR - Mack Chassis - Dash Panel Cracking at Mounting to BIW.
  • 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.
  • M0039 032026 Mar 2, 2026 · Emissions
    Emissions - EC0039 MST21 Failure to Detect P20EE - AN, CHU.
  • CBR 2246-5 032026 Mar 2, 2026 · Service Bulletin/Repair Instructions
    CBR - Z Spring Bracket Wear.
  • CBR 2712-7 032026 Mar 19, 2026 · Service Bulletin/Repair Instructions
    CBR - No Start Condition After Over the Air Programing.
  • CBR 2432-2 202601 Jan 8, 2026 · Service Bulletin/Repair Instructions
    CBR - Mack Chassis - AN And GR Models - Door Glass Shattering.
  • 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 199 202512 Dec 4, 2025 · Service Bulletin/Repair Instructions
    Vehicles affected by this issue will show coolant runoff on the front rights side of the engine.
  • CBR 2171-11 202511 Nov 22, 2025 · Service Bulletin/Repair Instructions
    CBR - Mack Temperature Sensor Troubleshooting Guide
  • CBR 199-6 202511 Nov 12, 2025 · Service Bulletin/Repair Instructions
    CBR - 13 Liter Engines ONLY - Engine Coolant Pump Housing Leak; Coolant Found Around The Oil Cooler Duct Cover Or In Between The Coolant Pump Housing And Oil Cooler Housing.
  • 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.
  • S4548 202506 Jun 1, 2025 · Service Campaign
    Mack Trucks has determined that certain model year 2020 to 2022 Anthem trucks could experience excessive wear on the hood latch pins causing the hood to rattle during normal vehicle operation.
  • CBR 2464-1 202505 May 1, 2025 · Service Bulletin/Repair Instructions
    Mack Chassis - Rear Axle Overheat
  • 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-2452 202503 Mar 17, 2025 · Service Bulletin/Repair Instructions
    If the vehicle door is open and the truck is in neutral, a popup message may appear on the Driver Information Display (DID) instructing the operator to shift into neutral. If this message appears while the vehicle is already in neutral, the Instrument Clust…
  • CBR-2449 202503 Mar 12, 2025 · Service Bulletin/Repair Instructions
    Cummins Exhaust Aftertreatment System (EATS) catalysts may experience cracking, which may be attributed to excessive vertical vibration in the exhaust stack. To mitigate this issue, a modification to the exhaust stack length is required.
  • 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-2024 202502 Feb 20, 2025 · Service Bulletin/Repair Instructions
    CBR - There have been a few trucks that have not passed the chuff test due to hose configuration and the software monitors not allowing for system or driver variables. This ABS software and hardware change will address both.
  • CBR-2432 202501 Jan 15, 2025 · Service Bulletin/Repair Instructions
    This CBR solution provides detailed instructions for diagnosing and addressing window glass shattering issues, including replacement specifications, interference checks, fastener verification, and reinforcement tab adjustments to ensure proper installation …
  • 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-2387 202409 Sep 2, 2024 · Service Bulletin/Repair Instructions
    CBR: Vehicles Equipped With A Lift Axle - Wheel Speed Fault Code SPN 793, SPN 794 Set When Axle Is Up
  • CBR-2376 202409 Sep 19, 2024 · Service Bulletin/Repair Instructions
    CBR: Drivers Information Display (DID) Inoperative/Goes Blank During Vehicle Operation
  • 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-343 202408 Aug 28, 2024 · Service Bulletin/Repair Instructions
    CBR: Mack chassis with an mDRIVE transmission, there have been reports of complete shift assemblies and TECUs being replaced due to technicians being unable to pinpoint the source of the air leak.
  • CBR-2384 202407 Jul 10, 2024 · Service Bulletin/Repair Instructions
    CBR: Mack Chassis - Day Cab Glass Breakage
  • CBR-2356 202407 Jul 9, 2024 · Service Bulletin/Repair Instructions
    CBR: Drivers Information Display (DID)Inoperative After Cluster Replacement And Programming
  • CBR-2350 202407 Jul 2, 2024 · Service Bulletin/Repair Instructions
    CBR: Telematics Gateway (TGW) Connect Ability Issues
  • CBR-2024 202407 Jul 8, 2024 · Service Bulletin/Repair Instructions
    CBR: Mack Anthem (AN) And Pinnacle (PI) -Bendix ABS Fault SPN 807 FMI 13 Blink code 19-4
  • CBR-2384 202406 Jun 29, 2024 · Service Bulletin/Repair Instructions
    CBR - Mack Chassis - Day Cab Glass Breakage
  • CBR-2383 202406 Jun 19, 2024 · Service Bulletin/Repair Instructions
    CBR - Accelerator Pedal: Inspection Instructions
  • CBR-2376 202406 Jun 11, 2024 · Service Bulletin/Repair Instructions
    CBR - Drivers Information Display (DID) Inoperative/Goes Blank During Vehicle Operation
  • CBR-2356 202406 Jun 8, 2024 · Service Bulletin/Repair Instructions
    CBR - Drivers Information Display (DID) Inoperative After Cluster Replacement And Programming
  • CBR-2375 202405 May 24, 2024 · Service Bulletin/Repair Instructions
    CBR: ZF/TRW Steering Gear Side Cover Leak
  • 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-2360 202404 Apr 2, 2024 · Service Bulletin/Repair Instructions
    CBR: Chassis Equipped With VECU5 Active Datalink/Communication Faults For Multiple Modules; ABS And SRS Communication Faults
  • CBR-2214 202404 Apr 22, 2024 · Service Bulletin/Repair Instructions
    CBR: Turbo Compound 2nd Generation - EGR And / Or DPF Diagnostic Trouble Codes (DTC), Diagnostic And Repair Information.
  • 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-2356 202403 Mar 1, 2024 · Service Bulletin/Repair Instructions
    CBR: After cluster replacement and programming, the Driver Information Display (DID) may not function as designed.
  • 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
Source: NHTSA manufacturer communications files.