2015 Hyundai Sonata problems & reliability
1,132 owner complaints filed with NHTSA for the 2015 Hyundai Sonata, alongside 9 safety recall campaigns. Last verified Aug 7, 2026. Complaints are unverified reports submitted by owners to the federal Office of Defects Investigation.
Each complaint is counted once (by NHTSA case number), even when it names several vehicles.
24 complaints report injuries (32 injured, 2 deaths reported).
Federal crash records (FARS 2020–2023): 2015 Hyundai Sonata vehicles were involved in 163 fatal crashes with 80 occupant deaths. Involvement counts are not adjusted for how many are on the road and do not imply fault or a vehicle defect.
Most reported problems
| Component | Complaints | Share |
|---|---|---|
| Engine | 614 | 54% |
| Electrical System | 166 | 15% |
| Unknown OR Other | 163 | 14% |
| Power Train | 133 | 12% |
| Steering | 74 | 7% |
| Fuel/propulsion System | 72 | 6% |
| Service Brakes | 72 | 6% |
| Vehicle Speed Control | 61 | 5% |
| Structure | 52 | 5% |
| Exterior Lighting | 38 | 3% |
Component groups as classified by NHTSA. A complaint can name more than one component, so shares may sum to more than 100%.
Common symptoms owners describe
Keyword analysis of complaint narratives; one complaint can describe several symptoms.
Mileage when problems occurred
Half of the failures with a reported odometer reading occurred by 58,076 miles (middle 50% between 25,000 and 88,500 miles), based on 573 complaints that included mileage.
Complaints by incident year
What owners report
“Engine / Short block assembly / Connecting rod bearing seizure. The engine suffered a sudden, catastrophic seizure while I was actively driving on a steep incline mountain road with a cliff on one side and forest on other. The vehicle experienced an immediate, total loss of motive power, forcing an emergency maneuver…”
Engine · filed Aug 5, 2026
“Driving vehicle at slow speed crossing an intersection and engine completely shut down. The engine has completely seized and needs replaced due to a known recall. I have only owned the vehicle for 7 months. Hyundai is refusing to pay for engine replacement claiming a previous recall prior to me owning the vehicle…”
Engine · filed Jul 31, 2026
“I was driving my 2015 Hyundai Sonata approximately 35 mph after leaving the Hyundai dealership following an engine replacement when the hood unexpectedly flew completely open without warning. The hood struck the windshield, completely obstructing my forward visibility and creating an extremely dangerous situation. I…”
Visibility/wiper · filed Jul 29, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Federal defect investigations
- Loss of Motive Power
Defect Petition DP22003 · opened Sep 12, 2022 · closed Dec 12, 2023
- Engine Fires
Engineering Analysis EA21003 · opened Dec 22, 2021 · closed Feb 5, 2024 · led to recall 23V877
- Throttle control system vulnerabilities
Defect Petition DP21003 · opened Nov 12, 2021 · closed Jun 20, 2023
- Electrical overstress
Engineering Analysis EA19001 · opened Apr 19, 2019 · closed Sep 19, 2024 · led to recall 20V024
Technical service bulletins
250 manufacturer communications (TSBs, service campaigns, warranty extensions) are on file with NHTSA for the 2015 Hyundai Sonata. The 10 most recent:
Certain Santa Fe (TMA), Santa Fe Sport (AN), Sonata (LFA), and Tucson (TL) vehicles equipped with Theta II engines may exhibit elevated engine-out emissions. The California Air Resources Board has determined that these…
26-01-013H-2 DN · Service Campaign · issued May 21, 2026
Certain Santa Fe (TMA), Santa Fe Sport (AN), Sonata (LFA), and Tucson (TL) vehicles equipped with Theta II engines may exhibit elevated engine-out emissions. This bulletin provides instructions for updating the Engine…
26-01-013H-2 TSB · Service Campaign · issued May 21, 2026
Following completion of Service Campaign 9C2 (Theta II Emissions Improvement), certain vehicles may exhibit a brief hesitation or rough shifting condition during cold start operation. If present, this condition is…
9C2 060518 · Service Campaign · issued May 19, 2026
Following completion of Service Campaign 9C2 (Theta II Emissions Improvement), certain vehicles may exhibit a brief hesitation or rough shifting condition during cold start operation. If present, this condition is…
9C2 DCS 260518 · Service Campaign · issued May 19, 2026
Certain Hyundai vehicles with exterior white paint may exhibit peeling or bubbling on metal body panels: hood, fender(s), roof, door(s), quarter panel(s), and tailgate/trunk. The paint warranty coverage for affected…
26-BD-002H TSB · Warranty Program/Extension · issued Apr 28, 2026
Some Hyundai vehicles with exterior white paint may exhibit peeling or bubbling on metal body panels: hood, fender(s), roof, door(s), quarter panel(s), and tailgate/trunk. The paint warranty coverage for affected…
26-BD-002H DN · Warranty Program/Extension · issued Apr 28, 2026
Some vehicles may exhibit difficulty starting in cold weather. This bulletin provides the procedure to perform an inspection on the starter magnetic switch for potential freezing and, if necessary, replace the starter…
26-EE-003H TSB · Service Bulletin/Repair Instructions · issued Apr 18, 2026
Certain 2019 – 2020 model year Santa Fe, 2017 – 2018 model year Santa Fe Sport, 2015 – 2019 model year Sonata, and 2018 – 2021 model year Tucson vehicles may exhibit elevated engine-out emissions. Hyundai is conducting…
9C2 OL · Service Campaign · issued Apr 14, 2026
The National Highway Traffic Safety Administration (NHTSA) has identified the presence of substandard and dangerous driver’s-side airbag inflators manufactured by Jilin Province Detiannuo Automobile Safety System Co.…
DTN DL · Other · issued Apr 10, 2026
The National Highway Traffic Safety Administration (NHTSA) has issued an urgent safety advisory regarding dangerous, counterfeit driver‑side airbag inflators manufactured by Jilin Province Detiannuo Automobile Safety…
DTN DCS · Other · issued Apr 10, 2026
TSBs are repair guidance manufacturers send to dealers — they are not recalls and repairs are not automatically free. Full documents are available on NHTSA’s site.
Safety recalls
The 2015 Hyundai Sonata has 9 NHTSA recall campaigns — recall repairs are free at franchised dealers regardless of the vehicle’s age.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →Buying a used 2015 Hyundai Sonata?
- · Decode the seller’s VIN with our free VIN decoder to confirm the exact year, engine and trim.
- · Check for unrepaired recalls by VIN on NHTSA’s official lookup — recall repairs are free.
- · Owners most often reported problems around 58,076 miles — budget accordingly if the car is approaching that mileage.