Recall 21V506 affects 1,737 2017-2021 Newmar motorhomes for a fuel-rail leak. Cummins service centers complete the repair for free.
Newmar is recalling 1,737 2017-2021 Ventana, Dutch Star, New Aire, and Mountain Aire vehicles equipped with certain Cummins diesel engines because the high-pressure fuel rail assembly can leak when a sealing washer does not seat correctly. A fuel leak near an ignition source increases the risk of fire, and Newmar dealers will complete the recall repair free of charge.
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What's wrong?
The high-pressure fuel rail assembly on these 2017-2021 Newmar Ventana, Dutch Star, New Aire, and Mountain Aire motorhomes is part of the Cummins diesel fuel injection system. It holds diesel fuel under high pressure and sends it to the injectors at the right moment. The accumulator is the fuel rail section that helps keep that pressure steady while the engine is running.
In NHTSA campaign 21V506, the problem is the sealing washer in the fuel rail assembly. The washer is supposed to sit squarely in the pilot boreholes, which are the machined openings that guide and seal the connection. If the washer does not seat correctly, the rail assembly can leak and create a prolonged diesel fuel spray. Spraying or misting fuel near an ignition source increases the risk of fire.
There is no warning sign before failure. Diesel odor, visible fuel, or engine-bay smoke should be treated as a serious sign to stop and contact a Newmar dealer.
Who's affected?
Spans the Ventana, Dutch Star, New Aire, and Mountain Aire lines across 2017-2021, all tied to the same high-pressure fuel rail assembly.
| 2021 Newmar Ventana | fuel system |
|---|---|
| 2021 Newmar Dutch Star | fuel system |
| 2021 Newmar New Aire | fuel system |
| 2020 Newmar Ventana | fuel system |
| 2020 Newmar New Aire | fuel system |
| 2020 Newmar Dutch Star | fuel system |
| 2019 Newmar Dutch Star | fuel system |
| 2019 Newmar Ventana | fuel system |
| 2018 Newmar Dutch Star | fuel system |
| 2018 Newmar Ventana | fuel system |
| 2017 Newmar Ventana | fuel system |
| 2017 Newmar Dutch Star | fuel system |
| 2019 Newmar Mountain Aire | fuel system |
| 2017 Newmar Mountain Aire | fuel system |
| 2018 Newmar Mountain Aire | fuel system |
| Units affected | 1,737 |
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 fuel leak near an ignition source increases the risk of a fire. If your VIN is included, schedule the inspection and repair promptly, and keep ignition sources away from any suspected fuel leak until the work is complete. Repair is free at any franchised Newmar dealer.
What should I do?
- Check your VIN to confirm your 2017-2021 Newmar Ventana, Dutch Star, New Aire, or Mountain Aire is included in this recall.
- Contact Newmar customer service at 1-800-731-8300 to schedule the free Cummins service-center fuel-rail inspection and repair.
- Ask whether the high-pressure fuel rail needs replacement, since the sealing washer problem allows a fuel leak near an ignition source.
- Bring the owner notice if you have it. If not, reference recall number 21V506 and Newmar recall Cummins 21E-32 when you call.
- Keep the motorhome away from ignition sources and stop driving if you see or smell diesel fuel before the repair is complete.
What happens at the repair
At the service center, the rail threads and fuel lines are inspected for the high-pressure fuel rail leak issue. If the rail needs replacement, it is replaced at no charge under the recall. Parts and labor are covered. Newmar has a reimbursement plan on file for owners who already paid for this repair before the recall work. If you have prior repair paperwork, contact Newmar customer service and ask how to submit documentation under that plan.
| Reimbursement | Reimbursement available |
|---|
Timeline
| July 2, 2021 | NHTSA published the recall |
|---|---|
| August 24, 2021 | Owner notification mailed |
| August 31, 2021 | Dealer notification began |
| August 31, 2021 | Dealer notification ended |
| August 31, 2021 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| August 31, 2021 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 21V506?
Recall 21V506 covers 1,737 2017-2021 Newmar Ventana, Dutch Star, New Aire, and Mountain Aire vehicles with certain Cummins diesel engines. A sealing washer in the high-pressure fuel rail assembly can fail to seat correctly, letting fuel leak from the rail assembly.
What should I do if my 2017-2021 Newmar Ventana, Dutch Star, New Aire, or Mountain Aire is on this recall?
Check your VIN to confirm your specific motorhome is included in recall 21V506. If it is, contact Newmar customer service at 1-800-731-8300 or a Newmar dealer to arrange the Cummins service-center inspection and any needed fuel-rail replacement.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to provide the recall remedy at no cost. For recall 21V506, Cummins service centers will inspect the rail threads and fuel lines, then replace the rail as needed, free of charge.
What is the safety risk in recall 21V506?
The safety risk is fire. If the high-pressure fuel rail assembly leaks, fuel near an ignition source increases the risk of a fire. Confirm your VIN first, then arrange the free inspection and repair if your motorhome is included.
When were owners notified about recall 21V506?
Newmar mailed owner notification letters on August 24, 2021. If you bought the motorhome used or never received a letter, check your VIN to confirm whether your specific vehicle is included, then reference recall 21V506 when you call Newmar or the dealer.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/21V506000 |
|---|---|
| Newmar customer service | 1-800-731-8300 |
| NHTSA recall # | 21V506 |
| NHTSA recall # (full) | 21V506000 |
Source documents
-
Download Recall Document (PDF) (PDF) - Download Quarterly Report (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 20, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →