AI Damage2020 Mack Granite (GU): common problems
The maker issued 90 service bulletins for this year. Details by component below, with sources.
Key figures
- Technical service bulletins (TSB)
- 90
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Engine and cooling | 0 | 0 | 38 |
| Electrical system | 0 | 0 | 15 |
| Equipment | 0 | 0 | 13 |
| Powertrain | 0 | 0 | 13 |
| Fuel system | 0 | 0 | 9 |
| Structure | 0 | 0 | 6 |
| Suspension | 0 | 0 | 6 |
| Engine | 0 | 0 | 2 |
| Service brakes | 0 | 0 | 2 |
| Electronic stability control | 0 | 0 | 1 |
| Exterior lighting | 0 | 0 | 1 |
| Lane departure | 0 | 0 | 1 |
| Latches, locks, linkages | 0 | 0 | 1 |
| Other | 0 | 0 | 2 |
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.
- Fuel system. Fuel smell, leaks, rough running, fuel-system codes.
Manufacturer service bulletins
Bulletin titles as filed with NHTSA.
- CBR
Turbo Compound (TC) Hot Side Noise, Diagnostic Information.
- 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…
- 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.
- Service Campaign - MP8 Stainless Oil Pan
- CBR -Telematics Gateway (TGW) Connect Ability Issues
- CBR - Active "Set Park Brake" Message On Drivers Information Display (DID)
- CBR - Automated Manual Transmission ( AMT ) Flywheel Pilot Bearing Wear On Input Shaft
- CBR - Driveline Noise, Suspension Ride Height Too High, Suspension Will Not Exhaust - Chassis Built…
- CBR
TGW Will Not Connect After SIM Card Replacement
- CBR
- 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.
- 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…
NHTSA lists 90 bulletins for this year; the 12 newest are shown here.
Other years of this model
Questions and answers
What are the most common problems with the 2020 Mack Granite (GU)?
There are no owner complaints in the NHTSA data for this year; the data comes from 90 manufacturer service bulletins.
How many service bulletins (TSB) were issued for the 2020 Mack Granite (GU)?
NHTSA lists 90 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 2020 Mack Granite (GU) 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 2020 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.