2021 Thor Motor Coach Magnitude problems

Filed Sep 23, 2025 · Body, Electrical · MD

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.

Filed Jun 15, 2023 · Electrical · CA

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 the chassis, to reassure the after market warranty that this wasn’t something “tampered with”. As a retired fire fighter, I have seen the result of RV fires. They burn fast, and people die. I felt I had no option but to refer this after their intransigent and dismissive attitude. I can supply additional documentation when I retrieve the vehicle from the shop.

Filed Dec 18, 2020 · Transmission · 6,671 miles · WA

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 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. The rv was taken to way scarff ford commercial trucks (119 7th st ne, auburn, wa 98002: (888) 394-6998) where it was diagnosed with needing the drive shaft to be replaced. The vehicle had not been repaired as of yet. The manufacturer had been informed of failure. The failure mileage was 6,671.