Recall 12V574 covers 727 2011-2013 Thor Motor Coach Tuscany, Ultrasport, Montecito, Palazzo, and Astoria RVs for loose diode jumpers. Repair is free.
Thor Motor Coach is recalling 727 2011-2013 Tuscany, Ultrasport, Montecito, Palazzo, and Astoria recreational vehicles because loose diode jumpers can open circuits for cruise control shutoff and brake lights. If the brake pedal does not cancel cruise control or light the brake lamps, crash risk increases; the dealer repair will be free once available.
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What's wrong?
On the 2011-2013 Thor Motor Coach Tuscany, Ultrasport, Montecito, Palazzo, and Astoria recreational vehicles, the affected electrical parts are diode jumpers in connectors on Freightliner XB and XC custom chassis. A diode jumper is a small electrical bridge that routes current in one direction inside a circuit. In this recall, those circuits help cancel cruise control when the brake pedal is pressed and turn on the brake lights.
The problem is that a diode jumper can loosen inside its connector. When that happens, the circuit opens instead of carrying the brake pedal signal. The brake pedal input then fails to reach one or both connected functions, so cruise control does not receive the cancel signal, the brake lights do not receive the light signal, or both.
There is no warning sign before failure. The first clue can be cruise control staying engaged after braking, brake lights failing to illuminate, or another driver reacting to missing brake-light communication.
Who's affected?
Spans 5 motorhome lines across the 2011-2013 model years, with cruise control, brake light, and electrical-system components listed.
| 2013 Thor Motor Coach Tuscany | Cruise control |
|---|---|
| 2013 Thor Motor Coach Tuscany | Brake lights |
| 2013 Thor Motor Coach Tuscany | electrical system |
| 2011 Thor Motor Coach Ultrasport | Cruise control |
| 2011 Thor Motor Coach Ultrasport | Brake lights |
| 2011 Thor Motor Coach Ultrasport | electrical system |
| 2011 Thor Motor Coach Tuscany | Cruise control |
| 2011 Thor Motor Coach Tuscany | Brake lights |
| 2011 Thor Motor Coach Tuscany | electrical system |
| 2011 Thor Motor Coach Montecito | Cruise control |
| 2011 Thor Motor Coach Montecito | Brake lights |
| 2011 Thor Motor Coach Montecito | electrical system |
| 2013 Thor Motor Coach Palazzo | Cruise control |
| 2013 Thor Motor Coach Palazzo | Brake lights |
| 2013 Thor Motor Coach Palazzo | electrical system |
| 2011 Thor Motor Coach Astoria | Cruise control |
| 2011 Thor Motor Coach Astoria | Brake lights |
| 2011 Thor Motor Coach Astoria | electrical system |
| 2012 Thor Motor Coach Tuscany | Cruise control |
| 2012 Thor Motor Coach Tuscany | Brake lights |
| 2012 Thor Motor Coach Tuscany | electrical system |
| Units affected | 727 |
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?
The cruise control can stay engaged when you press the brakes, and the brake lights can fail to show drivers behind you that you are slowing. That raises crash risk. Drive cautiously, leave extra room, and schedule the inspection soon. Repair will be free at any franchised Thor Motor Coach dealer once available.
What should I do?
- Check your VIN to confirm your 2011-2013 Thor Motor Coach Tuscany, Ultrasport, Montecito, Palazzo, or Astoria is included in this recall.
- Watch for the owner notice from Thor Motor Coach or Daimler Trucks before scheduling recall service.
- Contact a franchised Thor Motor Coach dealer and ask about the free diode-jumper inspection that fixes the loose connector issue affecting cruise-control disengagement and brake-light operation.
- Bring the recall notice if you have it. If not, reference recall number 12V574 when you call.
- Avoid using cruise control until the repair is complete, and confirm the brake lights work before each trip.
What happens at the repair
Daimler Trucks will notify owners on behalf of Thor Motor Coach. Once the dealer repair is available, the inspection and correction are free under the recall. At the dealer, technicians inspect the diode jumpers to confirm they are fully locked into their connectors. If a jumper is loose or the circuit is open, the dealer corrects the connection as needed so the brake pedal can disengage cruise control and turn on the brake lights. Thor Motor Coach lists DTNA Warranty Campaigns and the Customer Assistance Center as owner contact paths for this campaign.
Timeline
| December 11, 2012 | NHTSA published the recall |
|---|---|
| December 26, 2012 | Owner notification mailed |
Frequently asked questions
What is recall 12V574?
Recall 12V574 covers 727 2011-2013 Thor Motor Coach Tuscany, Astoria, Ultrasport, Montecito, and Palazzo RVs built on Freightliner XB and XC chassis. Loose diode jumpers can affect brake-light operation and cruise-control disengagement when the brake pedal is used.
What should I do if my 2011-2013 Thor Motor Coach Tuscany, Ultrasport, Montecito, Palazzo, or Astoria is on this recall?
Check your VIN to confirm your specific RV is included in recall 12V574. If it is, contact a franchised Thor Motor Coach dealer or DTNA Warranty Campaigns at (800) 547-0712 and ask for the diode-jumper inspection and correction.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to correct the defect at no cost to the owner. For recall 12V574, the dealer inspects the diode jumpers to confirm they are fully locked in place and corrects the vehicle as needed.
What is the safety risk?
The safety risk is loss of normal brake-related signaling and cruise-control shutoff. If cruise control does not disengage when the brakes are applied, crash risk increases. If the brake lights do not illuminate, drivers behind the RV do not receive the driver's braking signal.
When were owners notified about recall 12V574?
Owner notification for recall 12V574 began January 28, 2013. DTNA notified owners on behalf of Thor Motor Coach and provided the DTNA Warranty Campaigns phone number, (800) 547-0712, for service questions during Pacific Time business hours.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/12V574000 |
|---|---|
| Thor Motor Coach customer service | (800) 547-0712 |
| NHTSA recall # | 12V574 |
| NHTSA recall # (full) | 12V574000 |
Source documents
-
Download Owner Notification Letter (PDF) - Download Defect / Noncompliance Notice (PDF) (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on June 2, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →