Recall 19V504 covers 1,554 2019-2020 Thor Challenger, Miramar, Magnitude, Outlaw, Omni, and Palazzo motorhomes for slide-out movement. Repair is free at any franchised Thor dealer.
Thor is recalling 1,554 2019-2020 Challenger, Miramar, Magnitude, Outlaw, Omni, and Palazzo motorhomes because vehicle control system software can move the slide-out room unexpectedly. Unexpected movement of that room can increase the risk of injury, and Thor dealers will complete the recall repair free of charge.
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What's wrong?
The vehicle control system software in these 2019-2020 Thor Challenger, Miramar, Magnitude, Outlaw, Omni, and Palazzo motorhomes controls powered equipment in the coach, including the slide-out room. The slide-out is the room section that moves outward when parked to create more interior space, then retracts before travel. The control system is supposed to move it only when commanded.
On included motorhomes, defective software in that control system can cause the slide-out room to move unexpectedly. Thor had not confirmed the root cause in the recall filing, so the defect is described by what it does: the system can send or allow movement when the owner is not expecting it. A moving slide-out creates an injury risk for anyone beside it or working around it.
The slide-out can start moving without warning. There is no warning sign before failure.
Who's affected?
Spans the Palazzo, Outlaw, Challenger, Miramar, Magnitude, and Omni across 2019-2020, all tied to the recreational vehicle/trailer equipment component.
| 2019 Thor Palazzo | Recreational vehicle/trailer |
|---|---|
| 2019 Thor Motor Coach Outlaw | Recreational vehicle/trailer |
| 2019 Thor Motor Coach Challenger | Recreational vehicle/trailer |
| 2019 Thor Motor Coach Miramar | Recreational vehicle/trailer |
| 2020 Thor Motor Coach Magnitude | Recreational vehicle/trailer |
| 2020 Thor Motor Coach Omni | Recreational vehicle/trailer |
| 2020 Thor Motor Coach Miramar | Recreational vehicle/trailer |
| 2020 Thor Motor Coach Outlaw | Recreational vehicle/trailer |
| 2020 Thor Motor Coach Challenger | Recreational vehicle/trailer |
| 2019 Thor Motor Coach Magnitude | Recreational vehicle/trailer |
| 2019 Thor Motor Coach Omni | Recreational vehicle/trailer |
| 2020 Thor Motor Coach Palazzo | Recreational vehicle/trailer |
| Units affected | 1,554 |
| Field incidents | NHTSA has logged 1 field incident to date. |
The year and model narrow the scope, but the VIN decides. Check your VIN to confirm whether your specific motorhome is included.
What's the safety risk?
A slide-out room that moves unexpectedly can injure someone near or inside the room. There is no warning sign before the movement, so keep people clear of the slide-out area and schedule the software update soon. Repair is free at any franchised Thor dealer.
What should I do?
- Check your VIN to confirm your 2019-2020 Thor Palazzo, Outlaw, Challenger, Miramar, Magnitude, or Omni motorhome is included in this recall.
- Contact your nearest franchised Thor dealer to schedule the free vehicle-control-software update that stops the slide-out room from moving unexpectedly.
- Bring the recall notice if Thor mailed one. If not, reference recall number 19V504 and Thor recall RC000170 when you call.
- Keep people clear of the slide-out room until the software update is complete.
What happens at the repair
At the dealer, a Thor technician updates the affected vehicle control system software linked to unexpected slide-out room movement. The software update and labor are free under the recall. Thor has a general reimbursement plan on file for this campaign. If you already paid out of pocket for a related software or slide-out room repair before the recall work was performed, ask Thor customer service or the service desk how to submit documentation under that plan.
| Reimbursement | Reimbursement available |
|---|
Timeline
| June 30, 2019 | NHTSA published the recall |
|---|---|
| August 1, 2019 | Owner notification mailed |
| August 28, 2019 | Dealer notification began |
| August 28, 2019 | Dealer notification ended |
| August 28, 2019 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| August 28, 2019 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 19V504?
Recall 19V504 covers 1,554 2019-2020 Thor Challenger, Miramar, Magnitude, Outlaw, Omni, and Palazzo motorhomes with vehicle control system software that can let the slide-out room move unexpectedly. Thor dealers update the affected software for free.
What should I do if my 2019-2020 Thor Palazzo, Outlaw, Challenger, Miramar, Magnitude, or Omni is on this recall?
Check your VIN to confirm your specific motorhome is included in recall 19V504. If it is, contact a franchised Thor dealer to schedule the vehicle control system software update. Reference recall number 19V504 or Thor recall RC000170 when you call. The repair is free.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to fix the defect at no cost, and Thor's remedy says dealers will update the affected vehicle control system software free of charge. Parts and labor are covered at a franchised Thor dealer.
What is the safety risk?
The safety risk is unexpected slide-out room movement. If the room moves when a person is near it, the official consequence is increased injury risk. Keep people clear of the slide-out area until a Thor dealer completes the free software update.
When did Thor notify owners about recall 19V504?
Thor's recall remedy said owner notification was expected to begin August 28, 2019. That date has passed. If you own one of these motorhomes and never received a letter, check your VIN and call Thor customer service at 1-877-855-2867 or a franchised Thor dealer.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/19V504000 |
|---|---|
| Thor customer service | 1-877-855-2867 |
| NHTSA recall # | 19V504 |
| NHTSA recall # (full) | 19V504000 |
Source documents
-
Download Recall Investigation Document (PDF) (PDF) - Download Owner Notification Letter (PDF)
- Download Owner Notice (PDF)
- Download Recall Report (PDF)
- Download Quarterly Report (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 25, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →