2021 Thor Motor Coach ARIA: complaints, problems and recalls
Explore the records behind recurring owner reports.
Key facts
1 owner complaints analyzed
2 distinct recall campaigns
1,200 mi median reported failure mileage
Scope: 2021 model year. Data updated: . 1 complaints include usable failure mileage. View data status.
Most common problems
Wheels is the most frequently named component, appearing in 1 of 1 complaints (100.0%). A complaint can name multiple components.
Component breakdown
Number of unique complaints naming each component. Top eight shown.
| Category | Count |
|---|---|
| Wheels | 1 |
Wheels: 1
Reported problems by failure mileage
Complaint counts in mileage bands. These are not failure rates per vehicle or mile.
| Category | Count |
|---|---|
| Under 25,000 | 1 |
| 25,000 to 49,999 | 0 |
| 50,000 to 74,999 | 0 |
| 75,000 to 99,999 | 0 |
| 100,000 to 149,999 | 0 |
| 150,000 and above | 0 |
Under 25,000: 1; 25,000 to 49,999: 0; 50,000 to 74,999: 0; 75,000 to 99,999: 0; 100,000 to 149,999: 0; 150,000 and above: 0
Under 25,000 miles has the most reports with usable mileage (1). 0 complaints have missing, zero or invalid mileage.
Complaints over time
Year the complaint was filed, not the vehicle model year or incident year. The snapshot year is partial.
| Category | Count |
|---|---|
| 2021 | 1 |
2021: 1
Pattern summary
Wheels leads the component reports. Use these patterns to inspect individual reports and prepare questions for a mechanic.
Calculated from recorded counts. An AI narrative has not been published for this selection.
Examples from the source records
Examples provide context, not a representative sample or a verified diagnosis.
Owner report 11413641 · 2021-04-24 (April 24, 2021)
TIRE PRESSURE OUT OF LIMITS AND TEMPERATURES AT 400 F. ON THE DASH.
Owner-reported narrative. 1,200 miles reported. Look up ODI 11413641 at NHTSA ↗
Recall history
2 distinct campaigns affect this selection. Announcement dates below are different from vehicle model years. A campaign may cover multiple years.
20V559000 · Tires:Valve
Reported: 2020-09-15 (September 15, 2020)
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.
Consequence: 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.
Remedy: 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.
NHTSA campaign record ↗21V522000 · Equipment:Recreational Vehicle/Trailer | Structure
Reported: 2021-07-08 (July 8, 2021)
Thor Motor Coach (TMC) is recalling certain 2019 Challenger, Palazzo, Tuscany, 2019-2020 Miramar, 2019-2021 Aria, Outlaw, and Venetian recreational vehicles equipped with Hehr 6400 series windows. The adhesive that bonds the vented portion of the window may fail.
Consequence: Adhesive failure may cause the vent portion of the window to detach, increasing the risk of a crash or injury.
Remedy: Dealers will inspect the windows, and replace the vent if necessary, free of charge. Owner notification letters were mailed September 8, 2021. Owners may contact TMC customer service at 1-877-855-2867. TMC's number for this recall is RC000232.
NHTSA campaign record ↗Vehicle analysis explorer
Inspect model-year patterns, reported mileage, monthly activity and the evidence behind each signal.
Data completeness
1 unique complaints in this selection. Analysis snapshot: 2026-10-01.
Missing, zero and invalid mileage is excluded. Dates after the snapshot are excluded. Examples are limited selections, not a representative sample.
Problems by model year
Model-wide comparison of the eight most reported components across the model. Cells show counts and shares within each model year. Open a cell for source examples.
| Component | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2024 |
|---|---|---|---|---|---|---|---|
| Structure:Body | 150.0%ODI 11033139 · 45,000 miTL* THE CONTACT OWNS A 2017 THOR ARIA. THE CONTACT STATED THAT THE VEHICLE'S SIDE VIEW MIRRORS WERE DETACHING FROM THE VEHICLE. THE CONTACT TOOK THE VEHICLE TO THE DEALER (TRAVEL TRAILER CENTER INC, 1001 LITTLE KANAWAH RIVER RD, PARKSERBURG, WEST VIRGINIA; [phone removed]) WHO REPLACED THE SCREWS AND BOLTS USED TO ATTACH THE SIDE VIEW MIRRORS TO A SIZE BETTER EQUIPPED TO HOLD THE WEIGHT OF THE MIRRORS. THE MANUFACTURER WAS NOT AWARE OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 2.500. *LN CONSUMER STATED ALL THE BOLTS AND SCREWS WERE LOO… | 00.0%No examples available for this selection. | 150.0%ODI 11407069 · 7,800 miWHEN WE RESTARTED THE ENGINE OF OUR MOTOR COACH AFTER FUELING, THE AWNING AUTOMATICALLY EXTENDED. IT IT NOT SUPPOSED TO BE POSSIBLE TO EXTEND THE AWNING WHILE THE ENGINE IS ON. WE WERE ALSO TOLD THERE IS A SAFETY FEATURE THAT WILL NOT ALLOW THE VEHICLE TO DRIVE WITH THE AWNING EXTENDED. WHEN WE PULLED OUT OF THE FUELING LANE, THE AWNING CAUGHT THE PUMP AND DAMAGED IT. | 150.0%ODI 11463931THE FRESH WATER TANK, WHICH WAS ONLY HALF FULL OF WATER, BROKE THROUGH THE FLOOR ALLOWING THE TANK TO DROP DOWN TO THE ROAD. I WAS PULLING INTO A GAS STATION TO FILL UP WITH FUEL. LUCKILY IT HAPPENED BEFORE I GOT ON THE INTERSTATE AND WOULD HAVE BEEN TRAVELING AT A HIGHER RATE OF SPEED. THE TANK IS LOCATED IN FRONT OF THE REAR DUAL TIRES ON THE PASENGER SIDE OF THE MOTORHOME. AT A HIGHER SPEED, IF THE TANK DRAGGING ON THE GROUND WOULD HAVE COME LOOSE I WOULD HAVE RUN OVER THE TANK WHICH PROBABLY WOULD HAVE CAUSED LOOSING CONTROL OR EVEN F… | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. |
| Unknown Or Other | 150.0%ODI 11326559 · 15,000 miLOWER COMPARTMENT ( BASEMENT) BAY FLOORS ARE ROTTING DUE TO MOISTURE INFILTRATION FROM THE ROAD WHILE DRIVING IN THE RAIN. THE FLOORS ARE BULGING UNDERNEATH AND PRESENT A ROAD HAZARD IF STORED CARGO IS THROWN TO THE ROAD ENDANGERING OTHER MOTORISTS. THOR IS AWARE OF THE PROBLEM AND DOES NOTHING TO RECTIFY THE SITUATION. | 00.0%No examples available for this selection. | 2100.0%ODI 11407069 · 7,800 miWHEN WE RESTARTED THE ENGINE OF OUR MOTOR COACH AFTER FUELING, THE AWNING AUTOMATICALLY EXTENDED. IT IT NOT SUPPOSED TO BE POSSIBLE TO EXTEND THE AWNING WHILE THE ENGINE IS ON. WE WERE ALSO TOLD THERE IS A SAFETY FEATURE THAT WILL NOT ALLOW THE VEHICLE TO DRIVE WITH THE AWNING EXTENDED. WHEN WE PULLED OUT OF THE FUELING LANE, THE AWNING CAUGHT THE PUMP AND DAMAGED IT. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. |
| Electrical System | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 150.0%ODI 11407069 · 7,800 miWHEN WE RESTARTED THE ENGINE OF OUR MOTOR COACH AFTER FUELING, THE AWNING AUTOMATICALLY EXTENDED. IT IT NOT SUPPOSED TO BE POSSIBLE TO EXTEND THE AWNING WHILE THE ENGINE IS ON. WE WERE ALSO TOLD THERE IS A SAFETY FEATURE THAT WILL NOT ALLOW THE VEHICLE TO DRIVE WITH THE AWNING EXTENDED. WHEN WE PULLED OUT OF THE FUELING LANE, THE AWNING CAUGHT THE PUMP AND DAMAGED IT. | 150.0%ODI 11547978Four times while driving, the STOP ENGINE light came on causing the vehicle to slow to 5 MPH--twice while I was on the freeway in busy traffic--very hazardous. Two different error codes showed after the check engine light came on and then after I stopped and restarted the engine a few hours later, the check engine lights turned off. I took it to a Freightliner repair dealer and the accelerator pedal was defective. I only had 9000+ miles on the vehicle. The error codes were: spn 2623 FMI: 4 oc:6 sa:0 and Spn 91: Spn: 2 oc:3 sa:0. Note: the… | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. |
| Seat Belts | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 266.7%ODI 11457448Driver 5'07" tall weight approximately 245 lbs in seated position comfortable driving the seat belt will not extend to allow release or application of the emergency/parking brake. | 00.0%No examples available for this selection. |
| Equipment | 00.0%No examples available for this selection. | 1100.0%ODI 11557848 · 37,231 miThe contact owns a 2018 Freightliner XC-R. The contact stated that one of the windows located at the front end of the motorhome had started to delaminate. The contact used silicone to seal the window; however, he noticed that other windows in the motorhome were also experiencing the same failure. The contact stated that while driving at an unknown speed, a bathroom window detached from the RV. The contact stated that a total of five windows in the motorhome had failed due to an adhesive failure. Upon investigation, the contact discovered NHTSA … | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. |
| Structure | 00.0%No examples available for this selection. | 1100.0%ODI 11557848 · 37,231 miThe contact owns a 2018 Freightliner XC-R. The contact stated that one of the windows located at the front end of the motorhome had started to delaminate. The contact used silicone to seal the window; however, he noticed that other windows in the motorhome were also experiencing the same failure. The contact stated that while driving at an unknown speed, a bathroom window detached from the RV. The contact stated that a total of five windows in the motorhome had failed due to an adhesive failure. Upon investigation, the contact discovered NHTSA … | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. |
| Tires:Pressure Monitoring And Regulating Systems | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 133.3%ODI 11454307Tire pressure monitoring system fails during vehicle operation. The system will report high tire temperatures, high tire pressures and different tire readings will drop out providing no information. The inaccurate reporting informs the driver the vehicle has excessive tire temperatures and low or high tire pressures. The motorhome has been to the Freightliner repair facility twice and the defects are still occurring. This defect has occurred in August 2021, September 2021, October 2021, January 2022 | 00.0%No examples available for this selection. |
| Visibility:Glass, Side/Rear | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 150.0%ODI 11766786I have had 2 side windows fly off my motorhome while on the road .. did not see them fly.off but we're gone when I got to my destination ... There is another one ready to fly off ... The adhesive holding the bottom of the window has failed ... Have secured the remaining windows with rope and tape to keep them from flying off ... This is a serious safety issue with this motorhome and she is only 7 years old | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. |
Darker cells indicate a larger share of submitted complaints. Components overlap. This measures complaint composition, not failure probability.
Failure mileage by component
Median and middle 50% of usable owner-reported mileages. Ranges require at least five records.
| Component | Mileage range (25th–75th percentile) | Median | Usable records | Examples |
|---|---|---|---|---|
| Wheels | Too few reports for a range | 1,200 mi | 1 (sparse) | ODI 11413641 · 1,200 miTIRE PRESSURE OUT OF LIMITS AND TEMPERATURES AT 400 F. ON THE DASH. |
Complaint and recall timeline
Explore monthly filing activity alongside recall announcements. Up to ten years of monthly history is available.
Solid line: filed complaints. Dashed amber lines: recall announcement dates for this vehicle selection; markers include all recall components. The latest month is partial. Temporal proximity does not establish causation.
Monthly counts, recall campaigns and complaint examples
| Month | Complaints | Campaigns announced | Examples |
|---|---|---|---|
| 2024-11 | 0 | None | No examples available for this selection. |
| 2024-12 | 0 | None | No examples available for this selection. |
| 2025-01 | 0 | None | No examples available for this selection. |
| 2025-02 | 0 | None | No examples available for this selection. |
| 2025-03 | 0 | None | No examples available for this selection. |
| 2025-04 | 0 | None | No examples available for this selection. |
| 2025-05 | 0 | None | No examples available for this selection. |
| 2025-06 | 0 | None | No examples available for this selection. |
| 2025-07 | 0 | None | No examples available for this selection. |
| 2025-08 | 0 | None | No examples available for this selection. |
| 2025-09 | 0 | None | No examples available for this selection. |
| 2025-10 | 0 | None | No examples available for this selection. |
| 2025-11 | 0 | None | No examples available for this selection. |
| 2025-12 | 0 | None | No examples available for this selection. |
| 2026-01 | 0 | None | No examples available for this selection. |
| 2026-02 | 0 | None | No examples available for this selection. |
| 2026-03 | 0 | None | No examples available for this selection. |
| 2026-04 | 0 | None | No examples available for this selection. |
| 2026-05 | 0 | None | No examples available for this selection. |
| 2026-06 | 0 | None | No examples available for this selection. |
| 2026-07 | 0 | None | No examples available for this selection. |
| 2026-08 | 0 | None | No examples available for this selection. |
| 2026-09 | 0 | None | No examples available for this selection. |
| 2026-10 (partial) | 0 | None | No examples available for this selection. |
Emerging complaint spikes
Complete months in the latest six months with at least 10 complaints, at least twice the preceding 12-month average, and at least three square-root deviations above that average.
This is a descriptive screening rule, not a statistical defect finding. Publicity and reporting changes can increase submissions.
No complete months meet the spike thresholds for this selection.
Equal-age model-year comparison
Model-wide cumulative reports during the first three or five calendar years, starting with the model year (age 0). Only fully elapsed windows are compared.
2021: 1 complaints · 2022: 3 complaints
| Model year | Through age 0 | Through age 1 | Through age 2 |
|---|---|---|---|
| 2021 | 1 | 1 | 1 |
| 2022 | 3 | 3 | 3 |
Date coverage across each selected cohort
| Year | Incident dates used | Filing date fallbacks | Excluded dates |
|---|---|---|---|
| 2021 | 1 | 0 | 0 |
| 2022 | 3 | 0 | 0 |
Incident date is preferred when valid and no later than filing; otherwise filing date is used. Model year approximates age. Equal observation time does not adjust for sales, distance driven or reporting delays. One complaint linked to multiple model years can appear in each cohort.
Components reported together
Each cell counts unique complaints naming both components. Open a nonzero cell for examples.
| Component | Wheels |
|---|---|
| Wheels | — |
Co-reporting does not establish that one component caused another concern.
Recurring narrative patterns
Specific keyword mentions beyond broad component labels. Matching includes negations and comparisons and does not confirm a diagnosis.
0 patterns with matching reports.
No narratives match the published patterns.