AI Damage2021 Mack Granite (GR): common problems
The maker issued 219 service bulletins for this year. Details by component below, with sources.
Key figures
- Technical service bulletins (TSB)
- 219
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Engine and cooling | 0 | 0 | 84 |
| Electrical system | 0 | 0 | 53 |
| Powertrain | 0 | 0 | 30 |
| Equipment | 0 | 0 | 17 |
| Engine | 0 | 0 | 14 |
| Structure | 0 | 0 | 12 |
| Suspension | 0 | 0 | 11 |
| Fuel system | 0 | 0 | 9 |
| Service brakes | 0 | 0 | 9 |
| Wheels | 0 | 0 | 6 |
| Visibility | 0 | 0 | 5 |
| Fuel/propulsion system | 0 | 0 | 4 |
| Steering | 0 | 0 | 4 |
| Exterior lighting | 0 | 0 | 3 |
Comparison
What to check before buying
- Engine and cooling. Radiator and fan after a frontal hit, coolant level and condition, overheating.
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Powertrain. Shift quality under load, harsh shifts, transmission codes, CV joints.
- Engine. Cold start, unusual noises, oil leaks and engine codes.
Manufacturer service bulletins
Bulletin titles as filed with NHTSA.
- Mack Trucks Equipped With A Cummins Engine - Engine Preheat Icon Does Not Illuminate In The Instrument…
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…
- CBR - The purpose of this CBR is to provide information on 2010 and newer Mack Granite chassis…
CBR - The purpose of this CBR is to provide information on 2010 and newer Mack Granite chassis experiencing a low frequency vibration.
- CBR - Mack Chassis - Dash Panel Cracking at Mounting to BIW
- CBR - Mack Chassis - Through Shaft Bearing Retainer Breakage On Mack Carriers
- CBR - Mack Carrier Nut Adhesive Change
- CBR - No Start Condition After Over the Air Programing
- CBR - Mack Chassis - AN And GR Models - Door Glass Shattering
- CBR - Mack DEF Level (UQLS) Sensor Troubleshooting Guide - US17+OBD16 Emissions to US22+OBD2023 (DOES NOT…
CBR - Mack DEF Level (UQLS) Sensor Troubleshooting Guide - US17+OBD16 Emissions to US22+OBD2023 (DOES NOT APPLY TO AN(4) and PR(4)).
- Vehicles affected by this issue will show coolant runoff on the front rights side of the engine
- CBR - Mack Temperature Sensor Troubleshooting Guide
- CBR - 13 Liter Engines ONLY - Engine Coolant Pump Housing Leak; Coolant Found Around The Oil Cooler Duct…
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 - When an OTA (Over-The-Air) job starts to program the VECU blocks the starter relay out, if the job…
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.
NHTSA lists 219 bulletins for this year; the 12 newest are shown here.
Other years of this model
- Granite (GR) 201694 sources
- Granite (GR) 2017121 sources
- Granite (GR) 2018200 sources
- Granite (GR) 2019229 sources
- Granite (GR) 2020221 sources
- Granite (GR) 2022218 sources
- Granite (GR) 2023177 sources
- Granite (GR) 2024117 sources
- Granite (GR) 202563 sources
- Granite (GR) 202618 sources
- Granite (GR) 20278 sources
Questions and answers
What are the most common problems with the 2021 Mack Granite (GR)?
There are no owner complaints in the NHTSA data for this year; the data comes from 219 manufacturer service bulletins.
How many service bulletins (TSB) were issued for the 2021 Mack Granite (GR)?
NHTSA lists 219 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2021 Mack Granite (GR) from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Other 2021 models
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-04.