2021 Ford F-350 Super Duty: Problems & Reliability
CAUTION2021 Ford F-350 Super Duty: CAUTION — 7 owner complaints, rated on its recalls: 15 campaigns, 7 for fire or crash risk; top issue: fuel / propulsion system (3 complaints).
CarWhere's verdict score for the 2021 is 1.51, where 1.00 is a typical F-350 Super Duty year once complaints are weighted for severity and spread over time on the road; caution starts at 1.25 and avoid at 1.60. Severity drives it: 63% of those complaints report a crash, fire or injury or involve a safety-critical system (engine, powertrain, steering, brakes or fuel). Its raw count is below the median year, but it has been on the road only about 5 years, so complaints are arriving faster than for older F-350 Super Duty years.
Sources: NHTSA owner complaints (ODI), recall campaigns and manufacturer service bulletins, CarWhere verified buyer prices · Model years 2015–2026 compared · Updated 2026-11-12 · By CarWhere Research · Methodology
7
NHTSA complaints
1.51
Verdict score (1.00 = typical F-350 Super Duty year)
236
Service bulletins
15
Recall campaigns
Most-reported 2021 Ford F-350 Super Duty problems
Fuel / propulsion system is the clear leader, named in 43% of complaints.
| Component | Complaints | Share of 2021 complaints |
|---|---|---|
| Fuel / propulsion system | 3 | 43% |
| Fuel system | 3 | 43% |
| Diesel | 3 | 43% |
| Engine | 1 | 14% |
| Electrical system | 1 | 14% |
A complaint can name more than one component, so shares can add up to more than 100%.
2021 Ford F-350 Super Duty recalls
15 recall campaigns on federal record for the 2021, reported between Dec 10, 2020 and Mar 17, 2026.
| NHTSA campaign | Reported | Component |
|---|---|---|
| 26V158000 | Mar 17, 2026 | Fuel system, diesel › Delivery › Fuel pump |
| 25V686000 | Oct 10, 2025 | Backup camera / back-over prevention › Software |
| 25V626000 | Sep 19, 2025 | Steering › Column |
| 25V455000 | Jul 7, 2025 | Fuel system, gasoline › Delivery › Fuel pump |
| 25V048000 | Jan 31, 2025 | Backup camera / back-over prevention › Sensing system › Camera |
| 24V957000 | Dec 20, 2024 | Fuel system, diesel › Delivery › Fuel pump |
| 23V420000 | Jun 9, 2023 | Equipment › Other › Owners/service/other manual |
| 22V250000 | Apr 14, 2022 | Visibility › Windshield wiper/washer › Linkages |
| 22V087000 | Feb 16, 2022 | Structure › Frame and members › Underbody shields |
| 22V013000 | Jan 14, 2022 | Fuel system, diesel |
| 21V536000 | Jul 15, 2021 | Powertrain / transmission › Axle assembly |
| 21V390000 | May 25, 2021 | Powertrain / transmission › Axle hubs |
+3 more campaigns on the NHTSA record.
2021 Ford F-350 Super Duty service bulletins
The manufacturer has filed 236 technical service bulletins with NHTSA for the 2021 — close to the 234 of the median F-350 Super Duty year from 2015 to 2026. Coded bulletins most often cover powertrain / transmission (70), electrical system (63), engine & cooling (33). Bulletins are repair instructions for dealer technicians, not recalls.
The 2021 vs. the year before and after
From the 2020 to the 2021, owner complaints fell 30% (10 → 7) — an improvement. The 2022 that followed jumped 16.4× (7 → 115), so the 2021 is the cleaner of the two by count.
| Model year | Verdict | Complaints | Bulletins | Recalls | Avg. buyer-paid |
|---|---|---|---|---|---|
| 2020 F-350 Super Duty | AVOID | 10 | 299 | 16 | — |
| 2021 (this page) | CAUTION | 7 | 236 | 15 | — |
| 2022 F-350 Super Duty | AVOID | 115 | 231 | 17 | — |
Prices are averages of CarWhere verified buyer transactions (shown when 3+ deals exist for the year). Full year-by-year table: Ford F-350 Super Duty years to avoid.
What to check on a used 2021 Ford F-350 Super Duty
Fuel / propulsion system (3 complaints on the 2021): smell for fuel around the car, watch for hesitation or stalling, and check for a lit check-engine light.
Engine (1 complaint on the 2021): cold-start it yourself and listen for ticking or knocking; check for oil leaks, low coolant and a lit check-engine light, and ask for oil-change records.
Electrical system (1 complaint on the 2021): test every light, window, lock, the infotainment screen and the charging system, and have the car scanned for stored fault codes.
Recalls: confirm all 15 campaigns above were completed on this VIN.
Know what to pay for the right 2021 Ford F-350 Super Duty — then negotiate it
Years-to-avoid tells you which year. Search live listings to see the target price and what verified buyers actually paid for it.
- Verified buyer-paid target price for your exact make, model & trim
- DealDrive AI negotiator reads any dealer quote and writes your counteroffer
- Comparable real deals near you, from verified transactions
Found a 2021 Ford F-350 Super Duty for sale? See what the seller isn't telling you.
The CarWhere Used Car Report checks salvage records, salvage-auction listings, stolen-vehicle records, the odometer trail, and full market history for one VIN — $12.99, one time.
FAQ
Is the 2021 Ford F-350 Super Duty reliable?
2021 Ford F-350 Super Duty: CAUTION — 7 owner complaints, rated on its recalls: 15 campaigns, 7 for fire or crash risk; top issue: fuel / propulsion system (3 complaints). CarWhere's verdict score for the 2021 is 1.51, where 1.00 is a typical F-350 Super Duty year once complaints are weighted for severity and spread over time on the road; caution starts at 1.25 and avoid at 1.60.
What are the most common 2021 Ford F-350 Super Duty problems?
By NHTSA owner complaints, the most-reported areas on the 2021 Ford F-350 Super Duty are fuel / propulsion system (3, 43%), fuel system (3, 43%), diesel (3, 43%). The manufacturer has 236 service bulletins on file for this model year.
How many recalls does the 2021 Ford F-350 Super Duty have?
15 recall campaigns on federal record for the 2021 Ford F-350 Super Duty, most recently 26V158000 (Mar 17, 2026, fuel system, diesel); 25V686000 (Oct 10, 2025, backup camera / back-over prevention); 25V626000 (Sep 19, 2025, steering). Recall completion is VIN-specific, so check the exact car.
How do I check a specific 2021 Ford F-350 Super Duty before buying?
Decode the VIN free at carwhere.com/tools/vin-decoder to confirm the build, then run the $9.99 CarWhere Full VIN Report for the exact VIN — recall, complaint, and service-bulletin record for this model year, the original window sticker where the manufacturer publishes one, and a market price check from verified buyers. One-time purchase, no subscription.
Sources & method
Complaint, recall and service-bulletin counts for the 2021 Ford F-350 Super Duty come from NHTSA's Office of Defects Investigation; the verdict is CarWhere’s severity-weighted, time-on-road-adjusted score compared with the model’s own median year. Complaints are owner allegations, not verified defects. Full methodology.