2021 Ford F-250 SD problems & reliability
161 owner complaints filed with NHTSA for the 2021 Ford F-250 SD, alongside 12 safety recall campaigns. Last verified Aug 7, 2026. Complaints are unverified reports submitted by owners to the federal Office of Defects Investigation.
Each complaint is counted once (by NHTSA case number), even when it names several vehicles.
Most reported problems
| Component | Complaints | Share |
|---|---|---|
| Fuel System, Diesel | 25 | 16% |
| Power Train | 23 | 14% |
| Electrical System | 18 | 11% |
| Suspension | 18 | 11% |
| Steering | 15 | 9% |
| Unknown OR Other | 14 | 9% |
| Fuel/propulsion System | 12 | 7% |
| Visibility | 12 | 7% |
| Engine | 11 | 7% |
| Back Over Prevention | 10 | 6% |
Component groups as classified by NHTSA. A complaint can name more than one component, so shares may sum to more than 100%.
Common symptoms owners describe
Keyword analysis of complaint narratives; one complaint can describe several symptoms.
Mileage when problems occurred
Half of the failures with a reported odometer reading occurred by 49,000 miles (middle 50% between 30,000 and 89,000 miles), based on 45 complaints that included mileage.
Complaints by incident year
What owners report
“While driving the vehicle, the steering column released all of the bearings, allowing for the steering column to move up and down and in and out freely, making it unknown if the steering would follow which way the steering wheel was turned. I reached out to our personal mechanic in regards to this, and had to pay out…”
Steering · filed Aug 3, 2026
“The contact owns a 2021 Ford F-250. The contact stated that while driving 55 MPH, the engine warning light illuminated and the message "LIMP Mode in 34 Miles" was displayed. The dealer was contacted. The vehicle was diagnosed with a diesel emission fuel injector failure. The contact associated the failure with NHTSA…”
Fuel System, Diesel · filed Jul 21, 2026
“This is a follow-up to my original complaint #XXX, filed XXX, regarding the failure of the 10R140 10-speed automatic transmission in my 2021 Ford F-250 Super Duty (VIN: [XXX]). The transmission began exhibiting symptoms of gear slipping, jerking, delayed and harsh shifting, and pinging from the torque converter around…”
Power Train · filed Jul 15, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Federal defect investigations
- Sogefi Secondary Diesel Fuel Filter Leak
Preliminary Evaluation PE24014 · opened May 9, 2024 · open
Technical service bulletins
240 manufacturer communications (TSBs, service campaigns, warranty extensions) are on file with NHTSA for the 2021 Ford F-250 SD. The 10 most recent:
Customer Satisfaction Program 25M01 Certain 2021 Model Year F-150 3.0L Diesel Engine and 2020-2022 Model Year Super Duty with 6.7L Diesel Engine Nitrogen Oxide (NOx) Sensor Replacement, If Required After Dealer…
25M01 · Other · issued Jul 28, 2026
This article supersedes TSB 25-2572 to update the Parts List to correct the part number LC3Z-6006-L to LC3Z-6781-A, remove the flex plate bolts AL3Z-6379-BA from the parts list as these bolts are in kit LC3Z-6781-A…
TSB 26-2256 · Service Bulletin/Repair Instructions · issued Jun 19, 2026
This bulletin supersedes 25-2549. Reason for update: To add 2020 model year chassis cab vehicles. Some of the vehicles listed in the Model statement above may exhibit an incorrectly illuminated malfunction indicator…
TSB 26-2216 · Service Bulletin/Repair Instructions · issued May 6, 2026
Various 2020-2026 Ford and Lincoln vehicles equipped with blind spot information system (BLIS) may experience an inoperative blind spot monitoring with a "Blind Spot System Fault" message displayed in the instrument…
SSM 54720 · Service Bulletin/Repair Instructions · issued Apr 2, 2026
Advance Notice – Customer Satisfaction Program 25N17 Certain 2015-2025 Model Year Multiple Vehicle Lines Rear View Camera Replacement If Required After Dealer Evaluation
25N17 · Other · issued Mar 25, 2026
Some 2021-2026 F-150 vehicles equipped with a 5.0L/5.2L engine, 2021-2025 F-Super Duty/F-53 Motorhome/F59 Commercial Stripped Chassis vehicles equipped with a 6.8L/7.3L engine and 2021-2025 E-Series/F-650/F-750 vehicles…
SSM 54678 · Service Bulletin/Repair Instructions · issued Mar 20, 2026
This article supersedes TSB 24-2249 to update the claim quantity of the torque converter nuts, part number and claim quantity of the front support assembly bolt washers, and part number change of the fluid pan from the…
TSB 26-2088 · Service Bulletin/Repair Instructions · issued Mar 5, 2026
Ford and Lincoln vehicles equipped with wired keyless entry keypad systems and accessory wireless keyless entry keypad systems may or may not come with a wallet card containing the master code. Unlike the integrated…
SSM 54601 · Service Bulletin/Repair Instructions · issued Feb 24, 2026
Some 2019-2024 Ford and Lincoln vehicles equipped with SYNC3 may experience various connectivity concerns with The Ford App Lincoln App including but not limited to: missing activation prompt pop-upon the vehicle's…
SSM 54589 · Other · issued Feb 17, 2026
For 2017 2026 vehicles equipped with a 10R transmission, a revision to the Road Testing Vehicle procedure has been made in the WSM, located in Section 307-01 > Diagnosis and Testing. This updated procedure improves the…
SSM 54592 · Service Bulletin/Repair Instructions · issued Feb 17, 2026
TSBs are repair guidance manufacturers send to dealers — they are not recalls and repairs are not automatically free. Full documents are available on NHTSA’s site.
Safety recalls
The 2021 Ford F-250 SD has 12 NHTSA recall campaigns — recall repairs are free at franchised dealers regardless of the vehicle’s age.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →Buying a used 2021 Ford F-250 SD?
- · Decode the seller’s VIN with our free VIN decoder to confirm the exact year, engine and trim.
- · Check for unrepaired recalls by VIN on NHTSA’s official lookup — recall repairs are free.
- · Owners most often reported problems around 49,000 miles — budget accordingly if the car is approaching that mileage.