2015 Hyundai Sonata Engine cooling Problems
- Complaints
- 21about this part
- Share
- 2%of 1,153 total for the year
- Median mileage
- 97,000miles
- Trend
- RisingComplaints filed in the last 3 full calendar years are at least 25% higher than in the 3 years before.
NHTSA recorded 21 complaints about the engine cooling of the 2015 Hyundai Sonata, 2% of the 1,153 complaints for this model year. Where a mileage was given, the median is 97,000 miles. 2 a fire, according to the filers.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“The contact owns a 2015 Hyundai Sonata. The contact stated that while operating the vehicle, the check engine warning light illuminated, and the vehicle was shaking and vibrating abnormally. Additionally, the vehicle failed to accelerate above 40 MPH. The cause of the failure was not yet determined, and the vehicle was not yet repaired. The manufacturer and local dealer were not yet notified of the failure. The failure mileage was 136,000.”
NHTSA complaint #11655751, filed 2025-04, 136,000 miles“The contact owns a 2015 Hyundai Sonata. The contact stated while driving at various speeds, the vehicle backfired and sputtered. Additionally, the vehicle failed to accelerate as needed while depressing the accelerator pedal. The contact stated that the vehicle failed to exceed 20 MPH while driving uphill. Additionally, the contact noticed the presence of strong fumes inside the cabin, which caused her clothes and hair to smell like fumes. …”
NHTSA complaint #11639185, filed 2025-01, 77,000 miles“The contact's son owns a 2015 Hyundai Sonata. The contact stated that while the vehicle was being driven at 40-50 MPH, the vehicle began to jerk. The check engine light was illuminated. The vehicle was taken to an independent mechanic who determined the failure was related to the engine. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 102,198.”
NHTSA complaint #11736934, filed 2026-05, 102,198 miles“The contact owns a 2015 Hyundai Sonata. The contact stated that while decelerating and approaching a stop light, the vehicle suddenly experienced a loss of motive power and stalled. The vehicle could not be restarted and was later towed to the local dealer who diagnosed that the engine had seized and needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 104,000.”
NHTSA complaint #11574847, filed 2024-03, 104,000 miles“The contact owns a 2015 Hyundai Sonata. The contact stated while driving at various speeds, the vehicle skipped and failed to exceed 35 MPH. The contact received notification of Hyundai Service Campaign Number: 9C2 (ECU SOFTWARE UPDATE FOR THETA II EMISSIONS IMPROVEMENT), and the vehicle was towed to the dealer, where it was diagnosed and determined that the catalytic converter was clogged and needed to be replaced at the owner's expense. The vehicle was not yet repaired. …”
NHTSA complaint #11740388, filed 2026-05, 140,000 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…
- 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…
- 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…
- 10211669Apr 15, 2022Applicable vehicles with 2.0L T-GDI and 2.4L GDI engines may experience the Check Engine warning lamp illuminated with DTC P1326 and/or engine may exhibit Abnormal Noise or No…
- 10211665Apr 15, 2022Certain vehicles with 2.0L T-GDI and 2.4L GDI engines may experience the Check Engine warning lamp illuminated with DTC P1326 and/or engine may exhibit abnormal noise or no…
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 2015 Hyundai Sonata
629 complaintsOther or unknown
169 complaintsElectrical system
167 complaintsTransmission and drivetrain
135 complaintsFuel system
86 complaintsBrakes
79 complaintsSteering
74 complaintsVehicle speed control
61 complaintsBody and structure
52 complaintsExterior lighting
38 complaintsVisibility (wipers, defrost, mirrors)
30 complaintsAir bags
25 complaints
← All problems reported for the 2015 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