AI Damage2026 Mack Granite GR (4): common problems
The maker issued 20 service bulletins for this year. Details by component below, with sources.
Key figures
- Technical service bulletins (TSB)
- 20
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Electrical system | 0 | 0 | 9 |
| Powertrain | 0 | 0 | 6 |
| Engine | 0 | 0 | 4 |
| Air bags | 0 | 0 | 1 |
| Fuel/propulsion system | 0 | 0 | 1 |
| Seat belts | 0 | 0 | 1 |
| Service brakes | 0 | 0 | 1 |
| Structure | 0 | 0 | 1 |
| Other | 0 | 0 | 1 |
Comparison
What to check before buying
- 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.
- Air bags. Check the SRS light, stored codes and airbag/curtain status after any impact.
Manufacturer service bulletins
Bulletin titles as filed with NHTSA.
- Jumper Harness Repair for Version 4 Mack Trucks
- Power Cable Alternator Replacement
- Diagnostic instructions for CAN network communication issues
- The purpose of this CBR is to provide steps on how to correct a customer complaint of DTC P107B86…
The purpose of this CBR is to provide steps on how to correct a customer complaint of DTC P107B86 accompanied With intermittent loss of throttle.
- Fault diagnostic information for Supplemental Restraint / Airbag Inflation System (SRS)
- GDC - Transmission Oil Level Sensor
- CBR - Mack Chassis - Through Shaft Bearing Retainer Breakage On Mack Carriers
- CBR - Mack Carrier Nut Adhesive Change
- CBR - Parker F3 Hydraulic Pump Troubleshooting
- CBR - No Start Condition After Over the Air Programing
- Vehicles affected by this issue will show coolant runoff on the front rights side of the engine
- 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 20 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 2026 Mack Granite GR (4)?
There are no owner complaints in the NHTSA data for this year; the data comes from 20 manufacturer service bulletins.
How many service bulletins (TSB) were issued for the 2026 Mack Granite GR (4)?
NHTSA lists 20 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 2026 Mack Granite GR (4) 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 2026 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.