The 2021 Thor Motor Coach Ace has 1 NHTSA recall campaign affecting an estimated 71 vehicles. Recall repairs are always free at any authorized dealer. Owners have filed 6 complaints with NHTSA, most often about the electrical system. Last updated July 5, 2026.
Recall campaigns
VISIBILITY20V3390002020-06-0971 affected
Defect
Thor Motor Coach (TMC) is recalling certain 2020-2021 ACE, 2021 Four Winds and 2020 Gemini, Axis, Compass, Delano, Windsport, Hurricane, Outlaw, and Vegas motorhomes. The adhesive bond between the glass and the metal hinge frame of the frameless windows may fail which would then allow the glass to detach and fall…
Consequence
If the window glass detaches while the vehicle is moving it could become a projectile, increasing the risk of a crash.
Remedy
TMC will notify owners, and dealers will inspect the frameless windows for proper adhesive bond strength, replacing the windows as necessary, free of charge. The recall began July 10, 2020. Owners may contact TMC customer service at 1-877-855-2867. TMC's number for this recall is RC000192.
Complaints by component
ELECTRICAL SYSTEM
2
ENGINE
1
POWER TRAIN
1
SUSPENSION
1
VEHICLE SPEED CONTROL
1
Total complaints6
What owners report
Verbatim reports filed with NHTSA, lightly edited for readability and with personal
information removed.
“Air conditioner compressor wouldn't engage in rv. Called a mobile technician. Mobile technician found burnt and melted connectors on the control board. Technician stated the connectors used for 120v power were 12v crimp connectors and had burned and melted from the amperage. Technician stated that…”
“Returning home from trip, route us i26 in nc, heading down 6 degree hill lost all speed control. The following dash lights came on: abs, engine service, the wrench, anti sway control. We were able to roll to the side of the road just before an entrance ramp. There was no acceleration control.”
“Returning home from trip, route us i26 in nc, heading down 6 degree hill lost all speed control. The following dash lights came on: abs, engine service, the wrench, anti sway control. We were able to roll to the side of the road just before an entrance ramp. There was no acceleration control.”
“Returning home from trip, route us i26 in nc, heading down 6 degree hill lost all speed control. The following dash lights came on: abs, engine service, the wrench, anti sway control. We were able to roll to the side of the road just before an entrance ramp. There was no acceleration control.”
“The contact owns a 2021 thor motor coach ace rv. The contact received notification of nhtsa campaign number: 21v202000 (suspension, power train) however, the part to do the recall repair was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for…”
“The contact owns a 2021 thor motor coach ace rv. The contact received notification of nhtsa campaign number: 21v202000 (suspension, power train) however, the part to do the recall repair was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for…”
Recall, complaint, and investigation records from official NHTSA datasets (FLAT_RCL,
FLAT_CMPL, FLAT_INV), synced weekly. Counts reflect NHTSA records for the 2021 Thor Motor Coach Ace as of
July 5, 2026. Complaint narratives are consumer-submitted and unverified. This page
contains ads and affiliate links. Full methodology.