NHTSA lists 1 safety recall and 375 owner complaints for the 2018 Hyundai Sonata. Most complaints involve engine (212) and electrical system (60). The EPA rates it 26–31 mpg combined, and NHTSA gives it 5 stars overall.
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. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 401, "Internal Trunk Release."
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.
Complaints for each Sonata model year we’ve synced.
| Model year | NHTSA complaints |
|---|---|
| 1996 | 24 |
| 1997 | 52 |
| 1998 | 50 |
| 1999 | 170 |
| 2000 | 278 |
| 2001 | 219 |
| 2002 | 326 |
| 2003 | 199 |
| 2004 | 202 |
| 2005 | 165 |
| 2006 | 1,047 |
| 2007 | 696 |
| 2008 | 425 |
| 2009 | 460 |
| 2010 | 345 |
| 2011 | 3,380 |
| 2012 | 1,559 |
| 2013 | 1,917 |
| 2014 | 751 |
| 2015 | 1,156 |
| 2016 | 728 |
| 2017 | 766 |
| 2018 | 375 |
| 2019 | 162 |
| 2020 | 183 |
| 2021 | 134 |
| 2022 | 96 |
| 2023 | 88 |
| 2024 | 48 |
| 2025 | 17 |
| 2026 | 3 |
“What component or system failed or malfunctioned, and is it available for inspection upon request? The paint is peeling off the car, when I went to the dealership they said this is a known problem for 2015-2018, but they can't fix it there is no recall. It is causing rust. The valve cover gasket leaks oil and caused spark plugs to blow twice. How was your safety or the safety of others put at risk? The valve cover has caused my wife to be stuck on the side of the road early morning and my child to break down in another state. Has the problem been reproduced or confirmed by a dealer or independent service center? The dealer stated both of these are known issues for these years, 2015-2018. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? We took the car into the dealership for inspection. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? There was no warnings for either item.”
“We think there’s an issue with the abs module and wheel speed sensor because we started having a problem where the brakes wouldn’t work or would stutter. The car would shake real bad it would make an awful grinding sound but normally only when trying to stop at higher speeds or long braking. The only thing that made it stop was to unplug the abs but then other parts of the car stopped working like the speedometer and the sensors around the car. So we got the abs replaced but the new one started doing the same thing. We did some research and it sounds like the same issue Hyundai is having with the palisade. The incident that made us get it replaced to begin with was were driving down the road and we got to a traffic light but when we tried to brake they just didn’t work so we drove through the red light luckily the one person who was supposed to be going saw us and didn’t pull out in front of us so we didn’t get hit. We haven’t taken it to the dealership yet but my sister who teaches automotive repair at the community college is the one who diagnosed it so she said we should report it here so maybe it won’t happen to anyone else. Before we had the brake issue we…”
“I recently had the 9C2 Emissions recall update performed on my car, and since the update my car drives like total garbage after a cold start. It hesitates to accelerate, it bucks when trying to accelerate, and it’s to the point the engine is about to stall. I took it back to the Hyundai dealership and they said they are aware of the issue, but there is no fix from Hyundai at this time. This is a major safety concern, as the car barely wants to accelerate after a cold start. Please have Hyundai fix this safety issue.”
Towing, payload and dimensions aren’t in the EPA or NHTSA data, so we don’t list them.
| Version | City | Hwy | Comb. | Fuel / yr | CO₂ g/mi |
|---|---|---|---|---|---|
| Sonata Auto (AM7), 4 cyl, 1.6 L, Turbo · Front-Wheel Drive | 28 | 37 | 31 | $2,000 | 284 |
| Sonata SE Auto (S6), 4 cyl, 2.4 L · Front-Wheel Drive | 25 | 36 | 29 | $2,150 | 308 |
| Sonata Auto (S6), 4 cyl, 2.4 L · Front-Wheel Drive | 25 | 35 | 28 | $2,200 | 316 |
| Sonata Auto (S8), 4 cyl, 2.0 L, Turbo · Front-Wheel Drive | 23 | 32 | 26 | $2,400 | 342 |
| Item | Miles | Time | Note |
|---|---|---|---|
| Engine oil & filter | 5,000–10,000 mi | 6–12 months | Follow the oil-life monitor if fitted |
| Tire rotation | 5,000–7,500 mi | Every oil change | Check pressure monthly |
| Engine air filter | 15,000–30,000 mi | 1–2 years | Sooner in dusty areas |
| Cabin air filter | 15,000–25,000 mi | 1–2 years | |
| Brake fluid | — | 2–3 years | Absorbs moisture over time |
| Coolant | 60,000–100,000 mi | 5–10 years | Long-life coolants last longer |
| Spark plugs | 60,000–100,000 mi | — | Iridium/platinum plugs at the long end |
| 12V battery | — | 3–5 years | Heat shortens battery life |
1 safety recall as of Nov 9, 2026, according to NHTSA. Recall repairs are free at a dealer. Check your VIN to see whether your car is included and whether the repair was done.
Owners filed 375 complaints with NHTSA. The most-cited components are engine (212), electrical system (60), power train (40). Complaints are unverified owner reports and aren't adjusted for how many cars were sold.
The EPA rates the 2018 Hyundai Sonata at 26–31 mpg combined, depending on engine and drivetrain (4 versions rated).
NHTSA's New Car Assessment Program gives the 2018 Hyundai Sonata 5 out of 5 stars overall.