2018 Hyundai Sonata Safety Report
2018 Hyundai Sonata: Excellent Crash Ratings Overshadowed by Widespread Engine Failure Complaints
AI Safety Analysis for the 2018 Hyundai Sonata
Reliability Score
The 2018 Hyundai Sonata receives a reliability score of 45 out of 100 based on analysis of NHTSA complaint data, recall history, crash reports, and safety ratings. This indicates average reliability — some notable concerns exist that prospective buyers should be aware of.
Known Issues for the 2018 Hyundai Sonata
The following issues have been identified from NHTSA complaint data and owner reports for the 2018 Hyundai Sonata:
| Issue | Severity | Frequency | Typical Mileage |
|---|---|---|---|
| Excessive Engine Oil Consumption/Failure Numerous complaints detail rapid oil consumption, requiring frequent top-offs, leading to low oil levels, misfires, knocking noises, and eventual engine seizure or failure. Often linked to the Theta II engine. |
High | Common | 80000-120000 miles |
| Engine Misfires/Loss Of Power Drivers report sudden loss of engine power, misfiring, and the vehicle entering 'limp mode' while driving, creating dangerous situations on highways. |
High | Common | 80000-120000 miles |
| Trunk Latch Malfunction The trunk latch may become damaged, preventing it from opening from the inside, posing a risk of entrapment. This was subject to a recall. |
Medium | Occasional | N/A miles |
| Airbag Unexpected Deployment/Malfunction One complaint describes airbags deploying unexpectedly at 50 MPH, and another details an airbag detaching and causing a fatality in a crash. |
High | Rare | N/A miles |
| Electrical System Issues (No-Crank/No-Start) Intermittent no-crank, no-start conditions reported, leaving drivers stranded without warning. |
Medium | Occasional | N/A miles |
Common Problems Reported by Owners
Based on NHTSA complaint data, the following components account for the majority of reported issues with the 2018 Hyundai Sonata:
The most significant issue, with 112 complaints, involves excessive oil consumption, knocking, misfires, and complete engine failure, often linked to the Theta II engine.
A notable number of complaints (32) are categorized as 'UNKNOWN OR OTHER,' suggesting various unspecified or complex issues.
15 complaints relate to combined electrical system and engine issues, indicating potential interlinked failures.
15 complaints specifically mention exterior lighting problems, including dangerously dim low beams.
11 complaints are related to the engine and its cooling system, further highlighting powertrain concerns.
10 complaints regarding the vehicle's structure, though specific details are not provided in the summary.
Frequently Asked Questions About the 2018 Hyundai Sonata
Is the 2018 Hyundai Sonata safe?
Based on NHTSA data, the 2018 Hyundai Sonata received excellent crash test ratings (5-star overall, frontal, and side, 4-star rollover). However, it has a high number of complaints (350 total), including 18 crashes, 12 fires, 20 injuries, and 1 death, primarily driven by severe engine-related issues that can lead to sudden power loss and dangerous driving conditions. The trunk latch recall is also a safety concern.
What are common problems with the 2018 Hyundai Sonata?
The most reported issues for the 2018 Hyundai Sonata are overwhelmingly related to the ENGINE, accounting for 112 complaints. These include excessive oil consumption, engine knocking, misfires, and complete engine failure. Other notable problems include 'UNKNOWN OR OTHER' issues (32 complaints), combined ELECTRICAL SYSTEM and ENGINE problems (15 complaints), and EXTERIOR LIGHTING concerns (15 complaints).
Does the 2018 Hyundai Sonata have engine problems?
Yes, the 2018 Hyundai Sonata has significant and widespread engine problems. With 112 complaints specifically for the ENGINE component, issues like excessive oil consumption, loud knocking noises, misfires, sudden loss of power, and complete engine failure are frequently reported. Several complaints reference the known 'Theta II engine defect'.
Are there any recalls for the 2018 Hyundai Sonata?
Yes, the 2018 Hyundai Sonata has one recall (NHTSA Campaign Number 20V746000) concerning the LATCHES/LOCKS/LINKAGES:TRUNK LID:LATCH. The recall states that the trunk latch may become damaged, preventing it from opening from the inside, which increases the risk of injury if someone is trapped.
How does the 2018 Hyundai Sonata perform in crash tests?
The 2018 Hyundai Sonata performed very well in NHTSA crash tests, receiving an Overall 5-star safety rating. It scored 5 stars for both Frontal Crash and Side Crash tests, and 4 stars for the Rollover test.
Buyer Advice
Our recommendation: Given the excellent crash test ratings but significant and frequent engine-related complaints, potential buyers should proceed with caution and thoroughly investigate the vehicle's service history, especially regarding engine maintenance and oil consumption tests. A pre-purchase inspection by a trusted mechanic, focusing on the engine, is highly recommended.
NHTSA Data Summary for 2018 Hyundai Sonata
This safety report is based on a comprehensive analysis of data from the National Highway Traffic Safety Administration (NHTSA) for the 2018 Hyundai Sonata. The data includes 350 consumer complaints filed by vehicle owners, 1 manufacturer-initiated safety recalls, 18 reported crashes, 12 fire incidents, 20 reported injuries, and 1 fatalities associated with this vehicle.
The NHTSA has assigned the 2018 Hyundai Sonata an overall safety rating of 5 out of 5 stars, with a frontal crash rating of 5 stars, a side crash rating of 5 stars, and a rollover rating of 4 stars. These ratings are determined through controlled crash testing conducted by the NHTSA.
All data presented in this report is sourced from public NHTSA databases. Our AI analysis identifies patterns across complaint narratives, correlates them with recall history, and produces the safety assessment above. This analysis is updated as new complaints and recalls are filed with the NHTSA.
Consumers are encouraged to report vehicle safety problems to the NHTSA at nhtsa.gov. If your vehicle is subject to a recall, contact your dealer to schedule the free repair.