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Ford Heavy-Duty Trucks: Front Wheel Extender Can Detach

NHTSA campaign 21V390000 · Reported May 25, 2021 · Ford Motor Company

critical How serious is it? About this label

This is serious: Ford says owners should not drive their trucks until the wheel extender nuts are checked, because a detached wheel increases the risk of a crash.

⚠ NHTSA advises not driving this vehicle until it is repaired. See all such recalls.

Key facts

NHTSA campaign number	21V390000
Reported to NHTSA	May 25, 2021
Manufacturer	Ford Motor Company
Part affected	Power Train:axle Hubs
Vehicles covered	4 model/year combinations, model years 2021
Do-not-drive advisory	Yes
Park-outside advisory	No
Repair	Free at any franchised dealer

What's wrong, in plain English

Ford is recalling certain Super Duty trucks with dual rear wheels and front wheel hub extenders installed on the front wheels. On these trucks, the wheel hub extenders may not be properly attached to the front rotor hub assemblies. Because of this, a wheel along with its hub extender could become loose and separate from the truck while it is being driven, which could lead to a crash.

What you should do

1. Check your VIN at nhtsa.gov/recalls to see if your truck is included.
2. Do not drive the truck; contact a Ford dealer or Ford customer service at 1-866-436-7332 to arrange inspection.
3. The dealer will inspect and tighten the wheel hub extender nuts free of charge.

Where do I find my VIN, and what do I tell the dealer?

Your VIN is the 17-character code on the lower left of the windshield, on your registration and usually on your insurance card. Enter it at nhtsa.gov/recalls to see whether this recall is still open on your car. When you call the dealer, say you have an open safety recall and give them NHTSA campaign number 21V390000. More in how recalls work.

Affected vehicles (4)

2021 Ford F-350 SD
2021 Ford F-450 SD
2021 Ford F-550 SD
2021 Ford F-600 SD

Who to contact

Ford — official Ford recall lookup

Customer service: 1-866-436-7332

Any franchised dealer for the brand can do the repair. Phone numbers are taken from manufacturer sites and recent NHTSA notices; if one has changed, the number in your own recall letter is the one to use.

The bigger picture

Ford Powertrain Recalls Involving Fluid Leaks and Wheel Detachment · all 56 Ford recalls in this area

Other Ford F-450 SD recalls

Oct 20, 2026Ford F-350 SD and F-450 SD Tailgate Cable May Failhigh
Oct 6, 2026Ford Super Duty Trucks May Show Inaccurate Speedhigh
Sep 22, 2026Ford Expedition and Super Duty Trucks: Headlight Failuremedium
Mar 31, 2026Ford, Lincoln Windshield Wiper Arms May Breakmedium
Mar 17, 2026Ford Super Duty Fuel Pump May Fail Againhigh
Feb 20, 2026Ford and Lincoln Trailer Brake and Light Failurehigh

All 41 F-450 SD recalls

Official notice

Component: POWER TRAIN:AXLE HUBS
Summary: Ford Motor Company (Ford) is recalling certain 2021 F-350, F-450, F-550, and F-600 vehicles equipped with dual rear wheels and front wheel hub extenders. The front wheel hub extenders may be improperly attached to the front rotor hub assemblies, which could result in separation of the wheels and wheel extenders from the vehicle.
Safety risk: A detached wheel and wheel extender can increase the risk of a crash.
Remedy: Owners are instructed not to drive their vehicles until the torque of the wheel extender nuts can be verified. Dealers will inspect and tighten the front wheel hub extender nuts, free of charge. Owner notification letters were mailed on June 18, 2021. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 21S26.

Verify your specific vehicle by VIN at nhtsa.gov. Recall repairs are free of charge by law.