2021 Thor Motor Coach Magnitude
Problems, recalls and owner-reported issues
Electrical system is the leading concern among 3 owner complaints filed for this model year. This is the 2nd highest complaint count among 4 Magnitude model years with reports.
What owners report most often
Recalls and investigations
Equipment, recreational vehicle/trailer, lpg systems, lines and fittingsFeb 18, 2022
Thor Motor Coach (TMC) is recalling certain 2020-2021 Omni and Magnitude motorhomes. The LP gas line may have been incorrectly routed through the rear suspension leaf springs, which could damage the line and cause a gas leak.
A gas leak increases the risk of a fire.
Dealers will re-route the LP line as needed, free of charge. Owner notification letters were mailed March 24, 2022. Owners may contact TMC customer service at 1-877-798-855-2867. TMC's number for this recall is RC000256. This recall is an expansion of NHTSA recall 21V-754.
Campaign 22V094000 on NHTSA.gov
Equipment, recreational vehicle/trailer, lpg systems, lines and fittingsSep 28, 2021
Thor Motor Coach (TMC) is recalling 2021-2022 Magnitude and Omni motorhomes. The LP gas line may have been incorrectly routed through the rear suspension leaf springs, which could damage the line and cause a gas leak.
A gas leak increases the risk of a fire.
Dealers will re-route the LP line as necessary, free of charge. Owner notification letters were mailed November 23, 2021. Owners may contact TMC customer service at 1-877-855-2867. TMC's number for this recall is RC000242.
Campaign 21V754000 on NHTSA.gov
Representative owner complaints
3 reports, newest first.
Electrical system, Structure, Other or unspecified, Sep 23, 2025
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.
Electrical system, Jun 15, 2023
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.
Power train, Dec 18, 2020
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.