Most common 2018 Hyundai Sonata problems
Share of the 374 complaints; one complaint can involve more than one system. "~" is the median mileage when the problem started.
Hyundai Sonata complaints by model year
Best Sonata years: 2025, 2019, 2020. Years to avoid: 2011, 2013, 2012, 2015, 2017. Compare all years →
2018 Hyundai Sonata recalls (1)
Latches/locks/linkages › Trunk lid › Latch
Hyundai Motor America (Hyundai) is recalling certain 2017-2018 Sonata, 2016-2018 Sonata Hybrid, 2018-2020 Accent, and 2016-2017 Azera vehicles. The trunk latch may become damaged, preventing the opening of the trunk from the inside.
Remedy: Dealers will replace the trunk latch base, free of charge. Owner notification letters were mailed December 4, 2021. Owners may contact Hyundai customer service at 1-855-371-9460. Hyundai's number for this recall is 208.
NHTSA defect investigations
Federal safety investigators have looked into 2 possible defects involving the 2018 Hyundai Sonata:
Electrical overstress
The Office of Defects Investigation (ODI) opened this investigation to determine if the failure of airbags to deploy during severe crashes, in certain vehicles, was the result of a safety related defect. During the investigation a complex failure was studied that can result in non-deployment of subject vehicle air bags and other restraint system devices in severe crash events.
Loss of Motive Power
The National Highway Traffic Safety Administration (NHTSA) received a letter dated July 13, 2022, petitioning the Agency to initiate a safety defect investigation into loss of motive power allegations attributed to oil drain pan assembly failures on certain Hyundai Motor America, Inc. and Kia America, Inc. vehicles spanning Model Years (MY) 2005-2021.
What 2018 Hyundai Sonata owners say
Engine & cooling all 224 →
The contact owns a 2018 Hyundai Sonata. The contact stated that while receiving an oil change, the technician advised that the oil level was very low. The contact stated that the low oil warning was intermittently illuminated. The contact was advised to take the vehicle to a dealer to be diagnosed. The contact had taken the vehicle to a local dealer, where an oil consumption test was performed. The contact was advised that the vehicle was operating normally. The contact stated that the low oil warning light was illuminated again. The vehicle was taken back to the same dealer, and the oil level was topped off; another oil consumption test was suggested. The contact researched online and related the failure to a known issue of oil consumption that could lead to engine failure. …
The contact owns a 2018 Hyundai Sonata. The contact stated that while driving at 55 MPH, the vehicle suddenly lost motive power and was unable to accelerate above 60 MPH. The check engine warning light was illuminated. The vehicle was taken to the dealer, who diagnosed a failure with the knock sensor. The vehicle was repaired, but the failure reoccurred. The contact stated that later while driving at an undisclosed speed, the vehicle inadvertently lost all motive power. The contact was able to coast to the shoulder of the roadway, where the vehicle failed to restart. The check engine warning light was illuminated. The vehicle was towed back to the dealer, who diagnosed a failure with the connecting rod bearings. The contact was informed that metal was observed within the engine and that the engine would need to be replaced. The vehicle was not repaired. …
Electrical system all 60 →
The contact owns a 2018 Hyundai Sonata. The contact stated that while driving approximately 60 MPH the vehicle suddenly began sputtering and then completely stalled. The contact had to coast to the side of the road and noticed the check engine light illuminated. After approximately 10 minutes, the vehicle was able to restart. When starting the vehicle there would be a sputtering followed by the vehicle shutting off. The failure began to occur while idle as well. The contact stated that while attempting to reverse out of a parking spot the vehicle suddenly accelerated forward instead. As a result, the vehicle ended up crashing into a concrete light post. The air bags did not deploy. There were no injuries or medical attention needed. The vehicle was able to be driven after. No police report was filed. …
The contact owned a 2018 Hyundai Sonata. The contact stated that upon her daughter reaching her destination, she observed brown smoke emanating from the engine compartment. Within a short while, the vehicle became completely engulfed in flames, prompting a bystander to attempt to extinguish the fire with a fire extinguisher, but was unsuccessful. Local emergency services arrived and were able to extinguish the flames. A fire report was filed, and it was indicated that the fire may have been electrical, but an exact cause had not been determined. A police report was filed, and no injuries were reported. The vehicle was towed to a tow yard and deemed a total loss by the contact's insurance provider. The manufacturer was not notified of the failure. The failure mileage was 125,000.
Transmission & drivetrain all 40 →
The contact owns a 2018 Hyundai Sonata. The contact stated that while driving approximately 60 MPH the vehicle suddenly began sputtering and then completely stalled. The contact had to coast to the side of the road and noticed the check engine light illuminated. After approximately 10 minutes, the vehicle was able to restart. When starting the vehicle there would be a sputtering followed by the vehicle shutting off. The failure began to occur while idle as well. The contact stated that while attempting to reverse out of a parking spot the vehicle suddenly accelerated forward instead. As a result, the vehicle ended up crashing into a concrete light post. The air bags did not deploy. There were no injuries or medical attention needed. The vehicle was able to be driven after. No police report was filed. …
Unknown what system failed. The vehicle is at an impound lot and can be inspected on request. Police and fire department were on the scene. Police did provide a report # , and fire department provided a fire rescue case number. Safety of driver was put at risk due to the fire and potential for burning or even death. Other drivers could have been at risk if traffic had not allowed for quick movement to side of the road. No warning lamps had been on prior to the drive and none prior to fire. First indication was a burning smell while driving. As pulling over, another driver honked to alert to fire he could see from rear of ca,. before I noticed the flames. Upon getting out of car first flames I saw appeared to be coming from under passenger side of car. The fire department arrived about 15 minutes after pulling to side of the road. The car was fully engulfed in flames. …
2018 Hyundai Sonata engines & fuel economy
| Engine | Transmission | Drive | MPG city / hwy / combined |
|---|---|---|---|
| 2.0L 4-cyl hybrid | 6-speed dual-clutch | FWD | 40 / 46 / 42 |
| 2.0L 4-cyl plug-in hybrid | 6-speed dual-clutch | FWD | 37 / 42 / 39 |
| 1.6L 4-cyl turbo | 7-speed dual-clutch | FWD | 28 / 37 / 31 |
| 2.4L 4-cyl | 6-speed automatic | FWD | 25 / 36 / 29 |
| 2.0L 4-cyl turbo | 8-speed automatic | FWD | 23 / 32 / 26 |
EPA ratings. Class: Midsize car.
Frequently asked questions
Is the 2018 Hyundai Sonata a good car?
Based on 374 owner complaints filed with NHTSA, the 2018 Sonata rates average: 1.3× as many complaints as a typical year of the Sonata at the same age. Complaint counts don't account for sales volume or individual maintenance, so have any used car inspected before buying.
What is the most common problem with the 2018 Hyundai Sonata?
The engine & cooling — 224 complaints, 60% of all complaints for this model year, most often about engine › oil/lubrication › sump/tank. Next are the electrical system (60) and transmission & drivetrain (40).
How many recalls does the 2018 Hyundai Sonata have?
There is 1 recall for the 2018 Hyundai Sonata, the most recent from August 6, 2021 (latch). Recall repairs are free at any authorized dealer — check whether yours has been done with the VIN recall check.
What are the best and worst years of the Hyundai Sonata?
The best years by complaints, compared at the same age, are 2025, 2019 and 2020. Years to avoid or approach with caution: 2011, 2013, 2012, 2015 and 2017. See the full Hyundai Sonata years comparison.
At what mileage do 2018 Hyundai Sonata problems happen?
The median mileage reported in complaints is about 22,000 miles; 71% of problems with a recorded mileage started before 50,000 miles.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.