2021 Thor Motor Coach Magnitude problems, complaints & recalls
Most-reported problem areas: Power Train (1) · Electrical System (1)
Safety recalls (0)
No recalls on record for this model year (campaigns announced since 2010).
Service bulletins (1)
Technical service bulletins are repair instructions manufacturers send dealers for known issues. Unlike recalls, the fix is not automatically free — but naming the bulletin at the service desk can save diagnosis time and support goodwill repairs.
Visibility 2021-04-21 · RC000222SADealer · Service Bulletin/Repair Instructions
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
What owners report
2025-09-23 · Unknown Or Other“rear house battery tray weld failed, tray fell and hit the ground, damaging bim, various cables etc. identical to recall 19v-566 (2019–2020) but not included for 2021. safety concern: batteries may detach on roadway, cause shorts/fire, or total power loss. …”
2023-06-15 · Electrical System“a wiring harness was found pinched, pins bent and broken, apparently in the process of mating the motorhome body to the cassis cab. this cable has power in it and could result in a vehicle fire. thor has been completely unresponsive in assisting me, despite acknowledging it’s out of warranty, and i simply needed verification of their integration to…”
2020-12-18 · Power Train · 6,671 mi“tl* the contact owns a 2021 thor magnitude bb35 built on a 2020 ford f-550 chassis n/a. the contact stated while stationary at a traffic light, while the depressing the accelerator pedal, the rv made an abnormal noise and started to roll backwards. the contact stated no warning light was illuminated. the contact stopped the rv by depressing the bra…”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.