2018 Thor Motor Coach Palazzo problems, complaints & recalls
Most-reported problem areas: Visibility:glass, Side/Rear (2) · Visibility/Wiper (2) · Visibility (1)
Safety recalls (3)
Equipment:recreational Vehicle/Trailer 2023-02-23 · campaign 23V113000 · 1,969 vehicles
Defect: Thor Motor Coach (TMC) is recalling certain 2015-2023 Palazzo recreational vehicles. The front lower cap brackets that support the front fiberglass panel may become loose and detach from the vehicle while in motion.
Risk: A detached bracket can become a road hazard, increasing the risk of a crash.
Fix: Dealers will inspect and replace the front lower brackets, as necessary, free of charge. Owner notification letters were mailed March 15, 2023. Owners may contact TMC customer service at 1-877-855-2867. TMC's number for this recall is RC000291.
Tires:valve 2020-09-15 · campaign 20V559000 · 1,631 vehicles
Defect: Thor Motor Coach (TMC) is recalling certain 2018-2021 Aria, Palazzo, Tuscany, and Venetian motorhomes built on a Daimler Trucks (DTNA) chassis. The tire valve stem extension for the inner wheel may contact the outer wheel rim opening and become damaged.
Risk: Extensive damage to the valve stem extension may result in a loss of tire pressure of the inner wheel, increasing the risk of a crash.
Fix: TMC will notify owners, and DTNA dealers will inspect the inner wheel valve stem stabilizers, and adjust as needed and/or replace the inner valve stem, free of charge. The recall began November 2, 2020. Owners may contact TMC customer service at 1-800-524-5210 extension 104 or DTNA customer service at 1-800-547-0712. TMC's number for this recall is RC000204. DTNA's number for this recall is FL-861.
Exterior Lighting:turn Signal 2020-07-20 · campaign 20V418000 · 2,417 vehicles
Defect: Thor Motor Coach (TMC) is recalling certain 2017-2020 Aria, Venetian and Tuscany, 2017 Tuscany XTE and 2017-2019 Palazzo motorhomes vehicles that received an inspection-only remedy for recall 18V-763. The rear mounted Power Distribution Module (PDM) may have been damaged during manufacturing, possibly resulting in the rear marker lights, brake lights, or turn signals not functioning.
Risk: Non-functioning exterior marker lights can increase the risk of a crash.
Fix: TMC will notify owners, and Daimler Trucks dealers will replace the PDM, free of charge. Owner letters were mailed October 6, 2021. Owners may contact TMC customer service at 1-877-855-2867. TMC's number for this recall is RC000196.
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.
Structure 2021-01-13 · TSB 20-08 · Service Bulletin/Repair Instructions
the overhead cabinets located above the driver and front passenger seats may become loose during travel. this technical service bulletin will be gathering information regarding this possible concern and will provide guidance on how to ensure the overhead cabinets are properly secured in the motor
What owners report
2025-07-02 · Visibility:glass, Side/Rear“the thor motorhome has several windows. the windows they installed are laminated windows, with two panes of glass and a seal or glue which connects the outer glass to the inner glass. the attachment method for the outer glass is ineffective. as a result, the outer glass pane comes loose from the inner and is prone to fall off or fly off at highw…”
2024-11-08 · Visibility:glass, Side/Rear“my 2018 thor palazzo driverside and passenger side windows have fogged up to where it is very hard to see out of and has become a safety concern. …”
2024-07-04 · Structure:body“hello ntsb, the frameless windows thor used on my rv are all failing.. basically the adhesive used to glue the bottom rail onto the glass keeps failing. this week i had two windows fail. the top bunk window, and the emergency exit window. both window (at separate times) failed while driving. lucky i saw them break loose and my wife was able to gra…”
2024-06-12 · Unknown Or Other“the lp gas line running to the rear mounted water heater started leaking and when removed you see where the hose was burned due to faulty engineering of hanger supports or improper installation. i have the current hose and have pictures of the engine compartment and the burned hose. no insurance claim or manufacturer contact was initiated. if you…”
2024-05-01 · Unknown Or Other“recall 21-e-047 was a recall on herh window assemblies. the window adhesion is faulty and causes the window to separate from the vent bracket. i experienced this with my palazzo. while traveling this last weekend a window broke free and came close to smashing into the car behind me. an absolute nightmare. not only a major distraction to the rv…”
2024-01-29 · Visibility · 15,000 mi“the contact owns a 2018 thor palazzo. the contact stated that while driving at an undisclosed speed, through the sideview mirror, he observed movement of the driver's side awning window, prompting him to pull to the shoulder of the roadway. after a visual inspection, he observed that the glass panel within the awning window was detached. no warning…”
2023-11-09 · Unknown Or Other“the rear emergency exit window fell off during travel. being a large motorhome i do not know where or when it happened and was noticed upon arrival at home. it is likely it came detached in traffic. i do have the make or model of the window but the thor dax # is 0273323.…”
2023-08-18 · Unknown Or Other“the coach windows on the rv keep failing. last year i had two windows fail on my drive to wyoming. the sealant that hold the window bracket comes detached from the glass widow. when that happens the window flaps is the wind and if the window swing higher than 45 degrees, the window can slide off the top rail, and become a projectile for anyone trav…”
2022-05-21 · Unknown Or Other“floor of storage area is failing this could cause items in storage to fall out while driving. the items that fall out could be hit by the tires of the motorhome or hit another vehicle causing a serious accident. …”
2021-06-03 · Visibility/Wiper“the hehr-lippert windows installed on this thor motorhome have a design flaw where the adhesive between the outer glass and mounting frame becomes weak when expose to the sun/heat and can fly off the coach at speed and become a trajectory. the hehr-lippert side windows installed on this thor motorhome in the driver and passenger areas can fog bet…”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.