Recall 20V308 covers 566 2020 Thor Motor Coach motorhomes with incorrect Auto-P manual instructions. Dealers update the manual for free.
Thor Motor Coach is recalling 566 2020 motorhomes, including the Synergy, Gemini, and Delano, because the owner's manual gives incorrect conditions for the automatic parking function on Mercedes-Benz Sprinter chassis with automatic transmissions. If an owner relies on that Auto-P description, the motorhome has rollaway or unintended movement risk; the Thor Motor Coach dealer remedy is free.
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What's wrong?
The automatic parking function, called Auto-P in the Sprinter manual, is tied to the automatic transmission on these 2020 Thor Motor Coach motorhomes. When the programmed conditions are met, it is designed to place the transmission in Park so the vehicle does not roll after the driver leaves the seat. Owners depend on the manual to explain exactly when that feature engages.
In recall 20V308, the problem is not a broken transmission part. The owner's manual gave the wrong description of the conditions that trigger Auto-P. A driver who follows that description can think the transmission shifted into Park when it has not, especially after unbuckling and leaving the driver's seat without exiting through the driver-side door.
There is no warning sign before failure. The risk comes from relying on an incorrect manual description, so owners need the corrected Auto-P explanation added to the manual by an authorized Mercedes-Benz or Freightliner Sprinter dealer.
Who's affected?
Covers several Thor Motor Coach motorhome lines, each tied to vehicle equipment and automatic transmission components.
| 2020 Thor Motor Coach Synergy | vehicle equipment |
|---|---|
| 2020 Thor Motor Coach Synergy | automatic transmission |
| 2020 Thor Motor Coach Gemini | vehicle equipment |
| 2020 Thor Motor Coach Gemini | automatic transmission |
| 2020 Thor Motor Coach Delano | vehicle equipment |
| 2020 Thor Motor Coach Delano | automatic transmission |
| 2020 Thor Motor Coach Tiburon | vehicle equipment |
| 2020 Thor Motor Coach Tiburon | automatic transmission |
| 2020 Thor Motor Coach Compass | vehicle equipment |
| 2020 Thor Motor Coach Compass | automatic transmission |
| 2020 Thor Motor Coach Chateau Citation | vehicle equipment |
| 2020 Thor Motor Coach Chateau Citation | automatic transmission |
| 2020 Thor Motor Coach Siesta | vehicle equipment |
| 2020 Thor Motor Coach Siesta | automatic transmission |
| 2020 Thor Motor Coach Four Winds Siesta | vehicle equipment |
| 2020 Thor Motor Coach Four Winds Siesta | automatic transmission |
| 2020 Thor Daybreak | vehicle equipment |
| 2020 Thor Daybreak | automatic transmission |
| 2020 Thor Motor Coach Chateau | vehicle equipment |
| 2020 Thor Motor Coach Chateau | automatic transmission |
| 2020 Thor Motor Coach Four Winds | vehicle equipment |
| 2020 Thor Motor Coach Four Winds | automatic transmission |
| 2020 Thor Motor Coach Freedom Elite | vehicle equipment |
| 2020 Thor Motor Coach Freedom Elite | automatic transmission |
| 2020 Thor Motor Coach Quantum | vehicle equipment |
| 2020 Thor Motor Coach Quantum | automatic transmission |
| 2020 Thor Motor Coach Daybreak | vehicle equipment |
| 2020 Thor Motor Coach Daybreak | automatic transmission |
| Units affected | 566 |
| Field incidents | NHTSA has logged no field incidents to date. |
A matching year and model does not guarantee inclusion. Check your VIN to confirm whether this recall applies to your specific motorhome.
What's the safety risk?
The risk is rollaway or unintended vehicle movement if an owner relies on the incorrect Auto-P description in the Operator's Manual. Confirm the parking procedure with the dealer and follow the corrected Auto-P instructions after the supplement is added. Repair is free at any franchised Thor Motor Coach dealer.
What should I do?
- Check your VIN to confirm your 2020 Thor Motor Coach motorhome is included in this recall.
- Contact Thor Motor Coach customer service at 1-877-855-2867 to confirm the Mercedes-Benz dealer visit for the free Operator's Manual supplement.
- Reference recall number 20V308 and Thor Motor Coach recall RC000190 when you call.
- Bring the recall notice if Thor Motor Coach mailed one, or bring your VIN and the recall number to the dealer.
- Set the parking brake and follow the corrected Auto-P instructions until the manual supplement is complete.
What happens at the repair
At the dealer, a Thor Motor Coach technician supplements the Operator's Manual with the correct description of how the Auto-P automatic parking function works. The recall repair is free, and the work is a manual correction rather than a parts replacement. Repairs already paid are handled through the vehicle's New Vehicle Limited Warranty, not through a separate reimbursement program, since all involved vehicles remain under that warranty. Ask the service desk how warranty coverage applies if you have prior repair paperwork related to this issue.
| Reimbursement | Warranty coverage applies |
|---|
Timeline
| May 27, 2020 | NHTSA published the recall |
|---|---|
| June 25, 2020 | Owner notification mailed |
| July 26, 2020 | Dealer notification began |
| July 26, 2020 | Dealer notification ended |
| July 26, 2020 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| July 26, 2020 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 20V308?
Recall 20V308 covers 566 2020 Thor Motor Coach motorhomes built on Mercedes-Benz Sprinter chassis with automatic transmissions. The owner's manual gives an incorrect description of when the Auto-P parking function operates, creating rollaway or unintended movement risk. A Mercedes-Benz dealer will add the corrected Auto-P instructions for free.
What should I do if my 2020 Thor Motor Coach motorhome is on this recall?
Check your VIN to confirm your specific motorhome is included in recall 20V308. If it is, contact Thor Motor Coach customer service at 1-877-855-2867 or a Mercedes-Benz dealer to arrange the free owner's manual supplement. Reference recall number 20V308 when you call.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to provide the recall remedy at no cost. For recall 20V308, a Mercedes-Benz dealer will supplement the owner's manual with the correct Auto-P function description free of charge.
What is the safety risk?
The safety risk is rollaway or unintended vehicle movement. If an owner relies on the incorrect Auto-P description in the operator's manual, the vehicle can move when the owner expects it to stay parked, creating crash risk. Confirm your VIN and get the free manual correction.
What if I bought my Thor Motor Coach motorhome used?
The free recall remedy still applies. Federal recall law follows the vehicle, not the first owner. If you never received Thor Motor Coach's notice, check your VIN to confirm whether your specific motorhome is included, then reference recall number 20V308 when you call for service.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/20V308000 |
|---|---|
| Thor Motor Coach customer service | 1-877-855-2867 |
| NHTSA recall # | 20V308 |
| NHTSA recall # (full) | 20V308000 |
Source documents
-
Download Misc. Document (PDF) - Download Owner Notification Letter (PDF)
- Download Owner Notice (PDF)
- Download Recall Report (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 24, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →