NHTSA (USA)Critical
At a glance
What can fail
Biodiesel deposits can build up on the fuel pump's internal roller parts, potentially causing the high-pressure fuel pump to fail.
This page covers 9 recalls and 11 owner complaints for the 2021 Ford F-550 Sd.
The dominant pattern in 2021 Ford F-550 SD complaints centers heavily on the diesel fuel system, which accounts for the large majority of reports filed. Owners describe low fuel pressure warnings appearing on the message center, often accompanied by the check engine light, and in at least one case smoke was reported coming from the engine compartment during the event. Several owners note they were notified of a fuel system concern and contacted their dealer, with some finding that a remedy was not yet available at the time. One report mentions no active failure had occurred, suggesting some owners filed in response to the notification itself rather than a vehicle symptom. Steering and powertrain each account for a single complaint, with no recurring pattern across those systems.
11
Total Complaints
2
Fire-Related
By System
The 2021 Ford F-550 SD has 9 recalls, the most serious involving fuel system failures and a wheel separation risk that can cause sudden loss of drive power or a wheel detaching while driving.
Three recalls cover fuel delivery. The high-pressure diesel fuel pump can fail due to deposit buildup, cutting engine power, and a prior repair attempt did not fully resolve this for some vehicles. A separate low-pressure fuel pump defect can stall the engine, and on 6.7L diesel models a pinhole leak can develop in the secondary fuel filter cap, allowing fuel to escape near ignition sources and raising the risk of fire. On the chassis side, front wheel hub extenders on dual-rear-wheel models may be improperly attached and can separate from the vehicle entirely.
Visibility issues account for several more recalls: the windshield may not be properly bonded and can separate in a crash, wiper arms can break and leave the driver without wipers in wet conditions, and the rearview camera can display a blank or distorted image when reversing. The final recall affects SuperCab models, where the owner's manual lacks instructions for adjusting certain head restraints, leaving occupants at greater risk of neck injury in a crash.
At a glance
What can fail
Biodiesel deposits can build up on the fuel pump's internal roller parts, potentially causing the high-pressure fuel pump to fail.
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Complaints are owner-reported and reflect individual experiences, not confirmed defects. They are distinct from recalls. Data sourced from the national vehicle safety complaint database. See trending complaints →
What the fix does
Dealers will update your engine control computer software at no cost to prevent deposit buildup.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The low-pressure fuel pump may fail, causing the engine to stall while driving.
What the fix does
Ford is developing a fix. A second letter with repair instructions will be mailed when available, expected in Q2 2026.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The rearview camera may show a blank or distorted image instead of a clear view of the area behind the vehicle.
What the fix does
The dealer will replace the rearview camera at no cost to you.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
Biodiesel deposits can build up on the high-pressure fuel pump's internal roller parts, potentially causing the pump to fail.
What the fix does
Dealers will update your powertrain and transmission control software at no cost to prevent deposit buildup.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The owner's manual lacks instructions for adjusting or removing head restraints in certain seating positions, making these vehicles non-compliant with federal head restraint safety standards.
What the fix does
Ford will mail free owner's manual addendums with instructions for adjusting and removing center-position head restraints.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The windshield wiper arms can break, causing the windshield wipers to stop working.
What the fix does
Dealers will replace both front windshield wiper arms at no cost to you.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
A small void in the secondary fuel filter cap may grow into a pinhole leak over time, causing fuel to leak from the top of the secondary fuel filter.
What the fix does
Dealers will replace both the primary and secondary fuel filters at no cost to you.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The front wheel hub extenders may not be properly secured to the front rotor hub assemblies, potentially causing the wheels and extenders to separate from the vehicle.
What the fix does
Dealers will inspect and tighten the front wheel hub extender nuts at no cost to you.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The windshield may not be properly bonded to the vehicle during manufacturing, which could cause it to detach in a crash.
What the fix does
Dealers will remove and reinstall the windshield at no cost to you.
Summarized — see the official notice for exact wording, dates, and contacts.