AI Damage2020 Triumph Bonneville T120 Black reliability: common problems
Owners of the 2020 Triumph Bonneville T120 Black filed 1 complaints with NHTSA, most often about electrical system and steering. The maker issued 79 service bulletins for this year. Details by component below, with sources.
Key figures
- Owner complaints
- 1
- Technical service bulletins (TSB)
- 79
What fails most often
- 1 Electrical system 100% of all complaints
- 2 Steering 100% of all complaints
- Electrical system: 1 complaints (100% of all); manufacturer bulletins for this component: 62.
- Steering: 1 complaints (100% of all).
Symptoms owners describe
How many of the 1 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Electrical system | 1 | 0 | 62 |
| Steering | 1 | 0 | 0 |
| Equipment | 0 | 0 | 8 |
| Backover prevention | 0 | 0 | 2 |
| Engine and cooling | 0 | 0 | 2 |
| Other | 0 | 0 | 8 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
In addition, the headlights had overheated and melted. No warning light was illuminated. The local dealer was contacted, but the motorcycle was not diagnosed or repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 3,000.
Comparison
By complaint count this model year ranks 21,984 of 32,257 model years in the NHTSA data (among the 32% least complained about).
On average one model year of the Bonneville T120 Black has 0 complaints (10 years in the data). This year has 1, above average.
What to check before buying
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Steering. Steering play, power assist, rack and tie rods after a wheel impact.
- Backover prevention. Rear camera and parking sensors after a rear impact.
- Engine and cooling. Radiator and fan after a frontal hit, coolant level and condition, overheating.
Manufacturer service bulletins
Bulletin titles as filed with NHTSA.
- Dealer notice announcing the availability of Daignostic software and dealers should begin using it immediately
- Dealer notice announcing the availability of Triumph Diagnostic Tool 2026-07 and dealers should begin…
Dealer notice announcing the availability of Triumph Diagnostic Tool 2026-07 and dealers should begin using it immediately.
- Dealer notice announcing the availability of Triumph Diagnostic Tool 2026-06.1 and dealers should begin…
Dealer notice announcing the availability of Triumph Diagnostic Tool 2026-06.1 and dealers should begin using it immediately.
- Technical Bulletin 264 provides instructions that relates to
Triumph Diagnostic Tool - New Motorcycle Connection and Diagnostics Workflow, Triumph Diagnostic Tool - End of Support for Microsoft Windows 10.
- Dealer notice announcing the availability of Triumph Diagnostic Tool version 2026-06 and dealers should…
Dealer notice announcing the availability of Triumph Diagnostic Tool version 2026-06 and dealers should begin using it immediately.
- Dealer notice announcing the availability of Technical Bulletin 264
- Dealer notice advising the availalbility of TDT version 2026-05.2 which resolves the ABS as Not Connected…
Dealer notice advising the availalbility of TDT version 2026-05.2 which resolves the ABS as Not Connected issues in SmartScan, on Tracker 400 & Thruxton 400 models.
- Dealer notice announcing the availability of Diagnostic software 2026-05.1 and dealers should begin using…
- Dealer notice reminding of Motorcycle Cleaning, prohibited use of High-Pressure & Steam Cleaning equipment
- Dealer notice announcing the availability of Diagnostic software 2026-04 and dealers should begin using it…
- Dealer notice announcing the availability of Diagnostic software 2026-03 and dealers should begin using it…
- Dealer notice announcing the availability of Diagnostic software 2026-02 and dealers should begin using it…
NHTSA lists 79 bulletins for this year; the 12 newest are shown here.
Other years of this model
- Bonneville T120 Black 201654 sources
- Bonneville T120 Black 201749 sources
- Bonneville T120 Black 201842 sources
- Bonneville T120 Black 201942 sources
- Bonneville T120 Black 202280 sources
- Bonneville T120 Black 202343 sources
- Bonneville T120 Black 202443 sources
- Bonneville T120 Black 202546 sources
- Bonneville T120 Black 20263 sources
Questions and answers
What are the most common problems with the 2020 Triumph Bonneville T120 Black?
Owner complaints to NHTSA most often mention: electrical system, steering. Total complaints: 1. The most frequent symptoms in complaint texts: headlights and tail lights (100%), overheating, coolant loss (100%), warning lights, check engine (100%).
How many service bulletins (TSB) were issued for the 2020 Triumph Bonneville T120 Black?
NHTSA lists 79 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 Triumph Bonneville T120 Black 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 2026-11-06.