Recall 21V390 affects 17,616 2021 Ford Super Duty trucks with dual rear wheels for loose wheel hub extenders. Do not drive. Free dealer inspection.
A detached wheel and wheel extender can increase the risk of a crash. Do not drive the vehicle, even for short trips, until the wheel extender nut torque is verified. If vibration or noise starts while driving, stop in a safe place and call the dealer about towing. Repair is free at any franchised Ford dealer.
Ford is recalling 17,616 2021 F-350 Sd, F-450 Sd, F-550 Sd, and F-600 Sd trucks under recall 21V390 because front wheel hub extenders can be improperly attached to the rotor hub assemblies. Do not drive affected trucks until a Ford dealer completes the free repair; a detached wheel and wheel extender can increase the risk of a crash.
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What's wrong?
The front wheel hub extender on these 2021 Ford F-350 Sd, F-450 Sd, F-550 Sd, and F-600 Sd trucks is part of the front axle and wheel mounting hardware. On dual-rear-wheel trucks with wide front axles, the extender helps position the front wheel assembly correctly on the rotor hub. Its nuts need the right torque so the wheel, extender, and rotor hub stay clamped together.
On affected trucks, a supplier process error let certain front axle assemblies pass around the automated station that tightens and verifies those nuts. That left the nuts connecting the front wheel hub extender to the rotor below specification. As the truck is driven, loose nuts can let the extender move, and the front wheel and extender can separate from the vehicle.
The warning signs are vibration and noise while driving as the extender nuts loosen. If you notice those symptoms, treat them as a sign that the wheel mounting hardware is no longer staying tight.
Who's affected?
Covers the F-350 Sd, F-450 Sd, F-550 Sd, and F-600 Sd for the 2021 model year, all tied to the drive axle.
| 2021 Ford F-550 Sd | drive axle |
|---|---|
| 2021 Ford F-450 Sd | drive axle |
| 2021 Ford F-350 Sd | drive axle |
| 2021 Ford F-600 Sd | drive axle |
| Units affected | 17,616 |
| 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 your specific truck is included.
What's the safety risk?
A detached wheel and wheel extender can increase the risk of a crash. Do not drive the vehicle, even for short trips, until the wheel extender nut torque is verified. If vibration or noise starts while driving, stop in a safe place and call the dealer about towing. Repair is free at any franchised Ford dealer.
What should I do?
- Check your VIN to confirm your 2021 Ford F-550 Sd, F-450 Sd, F-350 Sd, or F-600 Sd is included in this recall.
- Do not drive the truck until a Ford dealer verifies and tightens the front wheel hub extender nuts.
- Arrange a tow if the truck has to be moved to the dealer; do not drive it there yourself.
- Contact a franchised Ford dealer to schedule the free inspection and hub-extender nut tightening that secures the front wheel hub extenders.
- Bring the recall notice if Ford mailed one. If not, reference recall number 21V390 and Ford recall 21S26 when you call.
What happens at the repair
Do not drive the vehicle until the front wheel hub extender nut torque is verified. At the dealer, a Ford technician inspects the front wheel hub extender nuts and tightens them to the correct torque. Parts and labor are free under the recall. Out-of-pocket repairs already paid are handled through Ford's original warranty program, not through a separate reimbursement program, because the warranty provides a free repair for this concern. Ask the service desk how warranty coverage applies if you have prior repair paperwork.
| Reimbursement | Warranty coverage applies |
|---|
Timeline
| May 25, 2021 | NHTSA published the recall |
|---|---|
| May 26, 2021 | Dealer notification began |
| May 26, 2021 | Dealer notification ended |
| June 14, 2021 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| June 14, 2021 | Interim owner notification (was planned for this date) |
| June 18, 2021 | Owner notification mailed |
Frequently asked questions
What is recall 21V390?
Recall 21V390 covers 17,616 2021 Ford F-350 Sd, F-450 Sd, F-550 Sd, and F-600 Sd vehicles with dual rear wheels and front wheel hub extenders. The hub extender nuts were not properly attached, so a wheel and extender can separate and increase crash risk.
What should I do if my 2021 Ford F-350 Sd, F-450 Sd, F-550 Sd, or F-600 Sd is on this recall?
Check your VIN to confirm your specific truck is included in recall 21V390. If it is, do not drive the vehicle until a Ford dealer verifies the wheel extender nut torque. Ask the dealer about towing if the truck has to move. The repair is free.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the defect at no cost. Ford dealers will inspect and tighten the front wheel hub extender nuts free of charge at any franchised Ford dealer.
What does do not drive mean for recall 21V390?
Do not drive the vehicle until the wheel extender nut torque is verified. The recall involves front wheel hub extenders that can separate with the wheels, increasing crash risk. Call a franchised Ford dealer, reference recall 21V390, and ask how they want the truck moved for inspection.
When were owners notified about recall 21V390?
Ford mailed owner notification letters on June 18, 2021. If you bought the truck used or never received a letter, the VIN still decides whether the recall applies. Check your VIN, then call a franchised Ford dealer with recall 21V390 if your truck is included.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/21V390000 |
|---|---|
| Ford customer service | 1-866-436-7332 |
| NHTSA recall # | 21V390 |
| NHTSA recall # (full) | 21V390000 |
Source documents
-
Download Recall Document (PDF) (PDF) - Download Quarterly Report (PDF)
- Download Recall Document (PDF) (PDF)
- Download Recall Report (PDF)
- Download Misc. Document (PDF)
- Download Owner Notification Letter (PDF)
- Download Owner Notice (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 →