Diesel Fuel System Failures

Frequent reports of fuel pump failures, DPF issues, and DEF injector problems leading to engine shutdown and power loss. Estimated repair cost: $500 - $2,500.

Unexpected engine shutdowns and loss of power, often linked to fuel system faults. Estimated repair cost: $1,000 - $5,000+.

Electrical System Faults

Widespread issues including wiring harness corrosion and module failures, leading to system unavailability and shutdowns. Estimated repair cost: $300 - $1,500.

"Death Wobble" Steering Instability

Severe steering wheel vibration and loss of control, particularly at higher speeds or over uneven surfaces. Estimated repair cost: $500 - $2,000.

Tailgate Latch Failure

Unintended tailgate opening, a recurring issue on some Ford truck models. Estimated repair cost: $200 - $500.

CARFOCALvehicle research

2021 Ford F-350 Maintenance guide

Name: Maintenance dataset for 2021 Ford F-350
Creator: Carfocal

v1.0Updated May 30, 2026Ryan Davis4 Sources Analyzed

MAINTENANCE SUMMARY

The 2021 Ford F-350 demands diligent maintenance, particularly concerning its diesel fuel system and engine. Owners report frequent issues with the fuel system, including pump failures and diesel particulate filter (DPF) and DEF injector problems, often manifesting as engine shutdown or power loss.

View Critical Issue: Engine Issues

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Reliability Score

Est. Annual Maintenance Cost

$500 - $1,000

TSBs & Recalls

1 TSBs | 0 Recalls

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Key Takeaways

Prioritize inspection and maintenance of the diesel fuel system due to frequent reports of pump failures and DPF/DEF issues.
Regularly check engine performance and be alert for signs of unexpected shutdowns, often linked to fuel system faults.

4 more takeaways unlock below

Critical service intervals

Common failure analysis

Symptoms and prevention guidance