*Median odometer reading when the problem happened, where owners gave one. One complaint can name several problem areas.
Engine
A franchise dealership performed a federally mandated safety recall service (ECM Software Update) and a knock sensor replacement on this 2015 Hyundai Sonata 2.0L Turbo. To perform these specific repairs, the technician had to work directly around the intake and turbocharger assembly workspace. Immediately after picking up the vehicle, it suffered a sudden and dangerous loss of power and refused to accelerate normally on the highway, creating a severe traffic hazard. Upon an immediate emergency inspection by the same service center 5 days later, the dealership documented in writing that the turbocharger intercooler hose clamps were completely off/unfastened. Because the technician left the…
Sep 9, 2026Visibility/wiper
The contact owns a 2015 Hyundai Sonata. The contact stated that while driving at 20 MPH, the driver-side windshield wiper failed to function properly. The vehicle was taken to an independent mechanic, who determined that the wiper blade was not making proper contact with the windshield due to a bent driver-side windshield wiper arm. The dealer was contacted and confirmed that no recall coverage applied to the failure. The contact associated the failure with NHTSA Campaign Number: 23V180000 (Visibility/Wiper). The contact notified the Hyundai manufacturer of the issue by phone. The failure mileage was approximately 26,400.
Oct 12, 2026 · 26,400 milesEngine
Hyundai Motor America is explicitly refusing to honor the mandatory safety recall and lifetime warranty extension for a catastrophic rod bearing failure on my 2015 Hyundai Sonata (VIN [XXX]). The engine suffered a sudden internal connecting rod bearing seizure while operating, causing a complete loss of motive power and creating an immediate hazard. Hyundai Corporate Escalations issued a blanket denial solely because the vehicle carries a rebuilt title. However, the vehicle's official Hyundai portal confirms that Service Campaign 953 (the Knock Sensor Detection System software update) was successfully completed on XXX. The engine failure matches the exact factory manufacturing defect…
Jun 20, 2026Unknown or other
I received a notice from Hyundai that there was a Service Campaign 9C2 for my car. My car was running fine but I took it to Jones Hyundai in Belair MD for oil change and the Service Campaign. After this work was done my car lost driveability, poor throttle response and transmission searching for correct gear. I notified Hyundai about my concerns and they replied they opened a case number. Corporate advice so far has been to let the car warm before driving, which has been marginaly helpful. It is hard to merge with high speed traffic because of poor throttle response and transmission searching for correct gear, I have had some close calls. I think cold weather will increase this problem.
May 21, 2026Power train
I am filing this complaint regarding transmission and drivability problems with my 2015 Hyundai Sonata 2.4L following Hyundai Campaign 9C-2. My vehicle was running and driving perfectly before this update. I have always maintained it on time, followed proper maintenance schedules, and have records documenting its maintenance history. I never experienced these transmission issues before the update. The problems began immediately after the campaign was performed. In fact, I noticed the abnormal shifting before I even left the dealership after picking up my vehicle. Since the update, the vehicle has experienced poor and abnormal shifting behavior. I contacted the dealership to report the…
Jul 16, 2026Engine
Ever since the 9C2 software update was completed on 94/26, the car is experiencing hesitations not only in the first few minutes of driving but after the engine is hot. It was driving perfectly before this update.
Sep 4, 2026Unknown or other
On May 28, 2026, the panoramic sunroof on my 2015 Hyundai Sonata became off track while I was driving. I could not get the sunroof back into its proper position because it was off track. I continued driving, and while I was traveling on the highway, the sunroof panel detached from the vehicle and flew down the highway. This created a serious safety hazard to me and other motorists. I was not the original owner and did not know the vehicle was subject to a recall. After the incident, I researched the vehicle and discovered Hyundai's Sonata Panoramic Sunroof Recall, Campaign 152. Hyundai's official website states that my vehicle is affected by the recall. Hyundai's recall description states…
May 28, 2026Engine
am seeking assistance regarding a sudden and unexpected engine failure with my vehicle. The Sonata only had approximately 80,000 miles on it when the engine failed. Prior to this happening, I had never experienced any problems with the vehicle. There were no warning lights or other indications that there was an issue with the engine, and the vehicle had passed inspection. The engine failure happened completely out of the blue. I have also kept up with the vehicleâs maintenance, including regular oil changes. I recently replaced the battery and tires as well. Hyundai previously denied my claim, stating that the vehicleâs salvage title was the reason for the denial. However, I would like…
Sep 28, 2026
Owner complaints are submitted to NHTSA by the public and are not verified. Shown as filed (NHTSA removes personal details); long reports are shortened.
