Complaints over time
Complaints about the 2020 Mack Granite (GR) peaked in 2024, with 2 filed
Owner complaints about this model year, by the year they were filed with NHTSA.
Source: NHTSA ODI complaints file. The lighter column runs through October.
Model year
2020 Mack Granite (GR)
Truck, diesel, 10x4, built in United States. Owner complaints on file from Jan 25, 2024 to Jan 25, 2024.
Recall campaigns covering this model year7107k vehicles or units across those campaigns
Owner complaints22.0 times the median 2020 truck
Severity index0.02020 trucks average 3.5
First 24 months0Complaints in its first two years
Components
100% of complaints about the 2020 Mack Granite (GR) name powertrain
Owner complaints by component. Hover or focus a bar for the crash, fire, injury or death count.
Source: NHTSA ODI complaints file. A complaint can name more than one component; it is counted under the first.
Recalls
7 recall campaigns cover the 2020 Mack Granite (GR)
Check a specific vehicle by VIN on NHTSA's site: a campaign may cover only part of a model year's production.
| Campaign | Filed | Subject | Component | Vehicles | Remedy |
|---|---|---|---|---|---|
| 25V-666 | Oct 6, 2025 | Seat belt anchorage bracket may be improperly welded | Seat belts | 15,841 | Repair or modification |
| 24V-792 | Oct 23, 2024 | Electrical noise and low signal to the power line carrier may cause the ECU to incorrectly process commands or stop working | Electrical system | 59,338 | Software update |
| 24V-773 | Oct 18, 2024 | Tires may not have been DOT tested and confirmed to be sufficient for the vehicles | Tires | 49 | Part replacement |
| 23V-600 | Aug 25, 2023 | Turn signals may be positioned incorrectly, reducing their visibility | Lighting | 27,418 | Not stated |
| 21V-233 | Apr 1, 2021 | Vehicles may not stay in their lane at certain speeds | Stability and traction control | 557 | Software update |
| 19V-896 | Dec 16, 2019 | Castle nuts and cotter pins used to connect the steering drag link to the pitman arm and steering arm may have not been correctly installed,… | Steering | 80 | Repair or modification |
| 19V-054 | Jan 24, 2019 | Passenger side door down view mirror may detach from the door | Visibility and wipers | 3,906 | Not stated |
Source: NHTSA ODI recalls file.
Owner complaints
What owners reported about the 2020 Mack Granite (GR)
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.
- Filed Jan 25, 2024Failure May 12, 2023Mukilteo, WAPower train, Differential unit
The driver was driving down the freeway and lost all power. The driveshaft fell out of the truck at 70 mph, luckly the truck was working a night shift and traffic was light, only a piece was still attached. The dealer confirmed rear differenial failure. There were no warnings before the failure.
NHTSA complaint 11567837 - Filed Jan 25, 2024Failure Apr 5, 2022Mukilteo, WAPower train
The driver was driving down an arterial street and the thru shaft failed on a blind corner. The driver was able to limp the truck to the shoulder. The drivers safety was put at risk as well as everyone else on the road, there would have been no way to move the trailer if it had been loaded and was blocking the road. The dealer was able to replace the thru shaft. The differential failed 7 months later and broke the drive shaft in half. Luckily the driver was able to get over to the shoulder and the pieces wedged between the crossmember and bottom of the truck so nothing was dropped onto the highway. The dealer performed the repairs under warranty. There was no warning before this happened.
NHTSA complaint 11567832
Source: NHTSA ODI complaints file.
Investigations
NHTSA has not opened an investigation on this model year
Source: NHTSA ODI investigations file.
Service bulletins
252 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 2595 072026 Jul 23, 2026 · Service Bulletin/Repair Instructions
CBR - The purpose of this CBR is to provide information on 2010 and newer Mack Granite chassis experiencing a low frequency vibration. - 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. - 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 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 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 70-8 202505 May 6, 2025 · Service Bulletin/Repair Instructions
Lack of lateral structural hood support. - 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-561 202503 Mar 6, 2025 · Service Bulletin/Repair Instructions
If oil dilution is suspected refer to the applicable CBR solution below: ∙ CBR-659Mack Chassis - Oil Diluted With Fuel; Fuel In Oil, Diagnostic Information - All Emissions, All Model Years - 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 - S4214 202409 Sep 25, 2024 · Service Campaign
Service Campaign: GR Hood Insulation - 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-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. - S3630 202402 Feb 18, 2024 · Service Bulletin/Repair Instructions
Service Campaign - MP8 Stainless Oil Pan. - 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-2016 202401 Jan 17, 2024 · Service Bulletin/Repair Instructions
CBR: Frame Or Cab Lean - 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. - PSM23m2na71 Nov 10, 2023 · Service Bulletin/Repair Instructions
Parts Sales and Marketing Bulletin: Mack Trucks is excited to announce an additional year warranty program on REMACK AMT mDRIVE Complete Transmissions. This extended warranty of 3 years or 350,000 miles on the transmission will be applicable when dealer in… - 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 - CBR-206 202310 Oct 12, 2023 · Service Bulletin/Repair Instructions
CBR: Vehicle Speed Factor (K-Factor) Programming - Speed Factor Value Incorrect When Calculated In Premium Tech Tool (PTT); Speedometer Reading Incorrectly Following A Change To Vehicle Speed Factor - US17+OBD16 And Newer Emissions, Common Model Year 2018. - U114 202309 Sep 28, 2023 · Service Bulletin/Repair Instructions
Owner Notification Letter, Extended Warranty Coverage U114. The EGR Cooler is the component provided coverage under this warranty extension. - 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 - M-141-001 202308 Aug 18, 2023 · Service Bulletin/Repair Instructions
TSB: Air Restriction Indicator - 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-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-2116 Rev 9 Jun 16, 2023 · Service Bulletin/Repair Instructions
Mack NOx Sensor Troubleshooting Guide - US10+OBD13 And Newer Emissions
Source: NHTSA manufacturer communications files.