Electrical System Problems

Complaints indicate issues with the electrical system, including starting problems in cold weather and potential wiring harness issues that can be linked to engine performance. These can affect overall vehicle operation and reliability. Estimated repair cost: $200 - $1,000.

Braking System Concerns

Some owners report issues with the braking system, including automatic emergency braking (AEB) malfunctions and pedal stiffness. These can impact stopping performance and safety. Estimated repair cost: $300 - $1,500.

Trunk Latch Mechanism

A recall (21V619000) addresses a potential failure of the trunk latch base, which could prevent the trunk from opening from the inside. This is a safety compliance issue. Estimated repair cost: $100 - $300.

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2018 Hyundai Sonata Maintenance guide

Name: Maintenance dataset for 2018 Hyundai Sonata
Creator: Carfocal

v1.0Updated May 30, 2026Daniel Wilson4 Sources Analyzed

MAINTENANCE SUMMARY

The 2018 Hyundai Sonata presents a 'Below Average' reliability verdict, largely due to significant engine issues reported by 37.4% of complaints. Owners should prioritize monitoring oil consumption and listening for unusual engine noises.

View Critical Issue: Engine Issues (Oil Consumption, Bearing Failure, Stalling)

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Reliability Score

Est. Annual Maintenance Cost

$400 - $700

TSBs & Recalls

57 TSBs | 1 Recalls

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Key Takeaways

Prioritize engine health due to high complaint volume.
Regular oil level checks are critical.

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Critical service intervals

Common failure analysis

Symptoms and prevention guidance