AI Damage2021 Thor Motor Coach Magnitude reliability: common problems
Owners of the 2021 Thor Motor Coach Magnitude filed 3 complaints with NHTSA, most often about electrical system and powertrain. The maker issued 1 service bulletins for this year. Details by component below, with sources.
Key figures
- Owner complaints
- 3
- Technical service bulletins (TSB)
- 1
What fails most often
- 1 Electrical system 67% of all complaints
- 2 Powertrain 33% of all complaints
- 3 Structure 33% of all complaints
- Electrical system: 2 complaints (67% of all).
- Powertrain: 1 complaints (33% of all).
- Structure: 1 complaints (33% of all).
Symptoms owners describe
How many of the 3 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 | 2 | 0 | 0 |
| Powertrain | 1 | 0 | 0 |
| Structure | 1 | 0 | 0 |
| Visibility | 0 | 0 | 1 |
| Other | 1 | 0 | 0 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
Identical to Recall 19V-566 (2019â2020) but not included for 2021.â¨â¨Safety concern: Batteries may detach on roadway, cause shorts/fire, or total power loss.â¨
This cable has power in it and could result in a vehicle fire. Thor has been completely unresponsive in assisting me, despite acknowledging itâs out of warranty, and I simply needed verification of their integration to the chassis, to reassure the after market warranty that this wasnât something âtampered…
The contact stated no warning light was illuminated. The contact stopped the rv by depressing the brake pedal. While shifting to park, the rv continued to roll backwards. The contact stated he used the parking brakes to keep the rv from moving.
When owners complained
NHTSA complaints by filing year. The peak shows at what age the problems show up most.
Comparison
By complaint count this model year ranks 15,523 of 32,257 model years in the NHTSA data (top 48% most complained about).
On average one model year of the Magnitude has 3 complaints (5 years in the data). This year has 3, about average.
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.
- Structure. Rails, pillars, panel gaps, signs of pulling or welding.
- Visibility. Wipers, mirrors, defrosters, cracked glass.
Manufacturer service bulletins
Bulletin titles as filed with NHTSA.
- The windshield may not have been properly adhered to the vehicle during vehicle assembly
The windshield may not stay adequately retained in a crash, which may increase the risk of injury to an occupant. This affects the following Thor Motor Coach products: model year 2021/2022 Magnitude and Omni motorhomes.
Other years of this model
Questions and answers
What are the most common problems with the 2021 Thor Motor Coach Magnitude?
Owner complaints to NHTSA most often mention: electrical system, powertrain, structure. Total complaints: 3. The most frequent symptoms in complaint texts: smoke, burning smell, fire (67%), loss of power / limp mode (33%), rollaway, parking brake (33%).
How many service bulletins (TSB) were issued for the 2021 Thor Motor Coach Magnitude?
NHTSA lists 1 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 Thor Motor Coach Magnitude 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 2026-11-06.