AI Damage2021 Freightliner 122SD: common problems
The maker issued 104 service bulletins for this year. Details by component below, with sources.
Key figures
- Technical service bulletins (TSB)
- 104
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Engine and cooling | 0 | 0 | 35 |
| Equipment | 0 | 0 | 30 |
| Engine | 0 | 0 | 18 |
| Powertrain | 0 | 0 | 18 |
| Electrical system | 0 | 0 | 14 |
| Suspension | 0 | 0 | 6 |
| Steering | 0 | 0 | 5 |
| Service brakes | 0 | 0 | 3 |
| Fuel system | 0 | 0 | 2 |
| Exterior lighting | 0 | 0 | 1 |
| Structure | 0 | 0 | 1 |
| Other | 0 | 0 | 1 |
Comparison
What to check before buying
- Engine and cooling. Radiator and fan after a frontal hit, coolant level and condition, overheating.
- Engine. Cold start, unusual noises, oil leaks and engine codes.
- Powertrain. Shift quality under load, harsh shifts, transmission codes, CV joints.
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
Manufacturer service bulletins
Bulletin titles as filed with NHTSA.
- Fleet Communications for solenoid issues
- Fleet Communications for NFD Lower Oil Plug Location - SP Axles
- Fleet Communications for Heater Core Plugging
- CX Advocate for Experiencing Excessive Purging from Air Dryer
- CX Advocate for TufTrac M12 Bolts (TSB-32-057-FTL)
- CX Advocate for ConMet Oil Pan Insert Additional Issues
- Technical Service Bulletin for TufTrac M12 Bolts
- CX Advocate for NOx conversion low faults
- Technical Service Bulletin for GHG17 and Newer DD Platform Heavy Duty Oil Pan Drain Plug Inserts
- CX Advocate for CARB tightening the Readiness Criteria applied to On-Board Diagnostic (OBD) test…
CX Advocate for CARB tightening the Readiness Criteria applied to On-Board Diagnostic (OBD) test submissions for the Clean Truck Check.
- Technical Service Bulletin for Detroit New Final Drive Standard Performance Forward Carrier Change to Top…
Technical Service Bulletin for Detroit New Final Drive Standard Performance Forward Carrier Change to Top Performance Passive Lube Management
- Revised Technical Service Bulletin for Detroit New Final Drive Standard Performance Forward Carrier Change…
Revised Technical Service Bulletin for Detroit New Final Drive Standard Performance Forward Carrier Change to Top Performance Passive Lube Management.
NHTSA lists 104 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 2021 Freightliner 122SD?
There are no owner complaints in the NHTSA data for this year; the data comes from 104 manufacturer service bulletins.
How many service bulletins (TSB) were issued for the 2021 Freightliner 122SD?
NHTSA lists 104 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 Freightliner 122SD 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.