2018 Hyundai Sonata Engine cooling Problems
- Complaints
- 14about this part
- Share
- 4%of 375 total for the year
- Median mileage
- 99,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 14 complaints about the engine cooling of the 2018 Hyundai Sonata, 4% of the 375 complaints for this model year. Where a mileage was given, the median is 99,000 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“My car started leaking oil from the oil drain bolt area. I took it to the dealer and they said the oil pan had a defect, they called it a “weld crack”. A quick internet search shows that this is a very widespread issue.”
NHTSA complaint #11496158, filed 2022-12“The contact owned a 2018 Hyundai Sonata. The contact stated that while driving at an undisclosed speed, the vehicle sputtered, jerked, and lost motive power. The check engine warning light was illuminated. The vehicle was able to restart but made an abnormal ticking sound. The vehicle was taken to the dealer but was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 72,000.”
NHTSA complaint #11678701, filed 2025-08, 72,000 miles“The contact owns a 2018 Hyundai Sonata. The contact stated engine oil constantly needed to be added between 1,200 and 1,800 miles. An independent mechanic was contacted. The vehicle was taken to an independent mechanic, and the contact was informed that there were no leaks found, and that the engine was in good operational order. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 118,000.”
NHTSA complaint #11689150, filed 2025-09, 118,000 miles“The contact owns a 2018 Hyundai Sonata. The contact stated while driving at approximately 70 MPH, the check engine warning illuminated. The contact stated that the vehicle was losing forward momentum. The contact depressed the accelerator pedal but the vehicle was still losing forward momentum and then stalled. The contact stated that he was able to coast to the side of the road. The contact attempted to restart the vehicle but was unable after several attempts. …”
NHTSA complaint #11584666, filed 2024-04, 120,000 miles“The contact owns a 2018 Hyundai Sonata. The contact stated that while driving approximately 60 MPH, the vehicle started to vibrate roughly. The contact felt the vibration in the steering wheel. The check engine warning light was illuminated. The contact slowed down and pulled off the roadway. The contact turned off and restarted the vehicle and was able to shift to drive(D); however, the vehicle was hesitating and failed to accelerate as needed. The contact drove the vehicle to an independent mechanic at speeds no greater than 40 MPH. …”
NHTSA complaint #11709976, filed 2026-01, 138,000 milesRelated service bulletins
- 10247189Oct 13, 2023This bulletin provides important checkpoint guidelines when performing engine oil and filter change services.
- 10238402Jun 29, 2023Certain 2015-2019MY Sonata (LFA) vehicles may intermittently exhibit reduced engine power, a âCrank/No Startâ condition, and/or have DTC P1233 stored in the ECM due to an…
- 10238401Jun 29, 2023Certain 2015-2019MY Sonata (LFA) vehicles may intermittently exhibit reduced engine power, a âCrank/No Startâ condition, and/or have DTC P1233 stored in the ECM due to an…
- 10235340Apr 6, 2023If you are servicing an 8-speed vehicle with a âCheck Engineâ light on and one or more of the DTC listed, follow the service procedure and replace the related solenoid and…
- 10233483Mar 6, 2023Certain 2015-19MY Sonata (LFA) vehicles equipped with 2.0L Turbo GDI engines need the Electronic Control Module (ECM) software updated to revise the fuel injection control logic…
- 10233481Mar 6, 2023This bulletin provides information related to an Electronic Control Module (ECM) software update to revise the fuel injection control logic to compensate for O2 sensor aging and…
- 10217251Jul 28, 2022Follow the guidelines outlined in this bulletin to inspect and clean or replace certain components of the engine intake system accordingly during engine short block or…
- 10213720May 19, 2022If you are servicing an applicable vehicle with a âCheck Engineâ light on and one or more of the DTC listed below, follow the repair procedure and replace the related…
- 10211674Apr 15, 2022The warranty coverage for engine long block repair or replacement regarding engine damage or malfunction from connecting rod bearing wear has been extended to 10 years or 120,000…
- 10211673Apr 15, 2022The warranty coverage for engine long block repair or replacement regarding engine damage or malfunction from connecting rod bearing wear has been extended to a Limited Lifetime…
Engine cooling: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2023 | 2 | 2% |
| 2021 | 1 | 1% |
| 2019 | 8 | 5% |
| 2018 | 14 | 4% |
| 2017 | 19 | 2% |
| 2016 | 17 | 2% |
| 2015 | 21 | 2% |
| 2014 | 21 | 3% |
| 2013 | 40 | 2% |
| 2012 | 11 | 1% |
| 2011 | 45 | 1% |
| 2009 | 6 | 1% |
| 2008 | 2 | 0% |
| 2007 | 8 | 1% |
| 2006 | 30 | 3% |
| 2005 | 5 | 3% |
| 2004 | 5 | 2% |
| 2003 | 14 | 7% |
| 2002 | 16 | 5% |
| 2001 | 23 | 11% |
| 2000 | 31 | 11% |
| 1999 | 23 | 19% |
| 1998 | 4 | 8% |
| 1997 | 7 | 14% |
| 1996 | 6 | 26% |
| 1995 | 9 | 14% |
| 1993 | 9 | 35% |
| 1992 | 4 | 18% |
| 1991 | 6 | 21% |
| 1989 | 5 | 45% |
Other parts of the 2018 Hyundai Sonata
212 complaintsElectrical system
60 complaintsOther or unknown
59 complaintsTransmission and drivetrain
40 complaintsFuel system
34 complaintsExterior lighting
22 complaintsVehicle speed control
19 complaintsBrakes
17 complaintsBody and structure
17 complaintsSteering
9 complaintsLatches, locks and linkages
8 complaintsSeat belts
8 complaints
← All problems reported for the 2018 Hyundai Sonata
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology