Engine Stalling or Loss of Power

Complaints indicate engines stalling or losing power, often at low mileages. This is a significant concern affecting core vehicle operation. Potential causes range from fuel delivery issues to sensor malfunctions. Estimated repair cost: $500 - $2,500.

Electrical System Malfunctions

A notable number of complaints involve the electrical system, affecting various functions from infotainment to critical safety systems. Issues can be intermittent and difficult to diagnose. Estimated repair cost: $200 - $1,000.

Fuel System Leaks or Odors

Critical recalls address fuel system components, including potential leaks and fuel tank issues. Owners should be aware of fuel odors or visible leaks as serious indicators. Estimated repair cost: $300 - $1,500.

CARFOCALvehicle research

2021 Hyundai Sonata Maintenance guide

Name: Maintenance dataset for 2021 Hyundai Sonata
Creator: Carfocal

v1.0Updated May 30, 2026Ryan Davis4 Sources Analyzed3 Critical Recalls

MAINTENANCE SUMMARY

The 2021 Hyundai Sonata, with a 'Below Average' reliability verdict, requires diligent maintenance. Focus on potential engine and powertrain issues, which are top complaint areas.

View Critical Issue: Powertrain/Transmission Issues

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Reliability Score

Est. Annual Maintenance Cost

$400 - $700

TSBs & Recalls

12 TSBs | 7 Recalls

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Key Takeaways

Prioritize inspections of the engine, powertrain, and fuel system due to frequent complaints and recalls.
Regular oil changes and filter replacements are essential for engine longevity.

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Critical service intervals

Common failure analysis

Symptoms and prevention guidance