2019 Hyundai Sonata Hybrid Owner Complaints

The primary failure is in the Engine/Powertrain system and Knock Sensor Detection System (KSDS), causing 6 identical sudden engine stalls (OBD-II code P1326) from 09/2000 to 06/2026. Additionally, severe excessive oil consumption was documented during 2 of these diagnostic visits, showing deep-seated engine issues. The vehicle and all records are available for inspection at the Hyundai dealer. Safety was severely threatened on 6 occasions. The vehicle abruptly stalled at 60+ mph in active highway traffic, forcing an immediate engine shutdown. This left me with highly impaired steering and braking control in fast-moving traffic, creating an imminent risk of high-speed rear-end collisions and jeopardizing my life and others. The primary stalling defect and P1326 code were confirmed 6 separate times by the authorized Hyundai dealership. The secondary excessive oil consumption issue was also formally confirmed by the dealer during 2 of those visits. Despite multiple dealership-confirmed diagnoses, no permanent repair has been achieved. The vehicle has been inspected during all 6 visits by dealership technicians. For the current (6th) visit, the dealer could not resolve the recurring defect and formally contacted Hyundai Corporate Technical Support for expert analysis, which is currently ongoing. Except for the first visit, the pattern is identical: the car stalls, the dealer clears codes/replaces KSDS, and it stalls again within 3 weeks. Notably, during the 4th visit, they replaced the Intake Manifold. Now, on this 6th visit, they demand I pay to replace that same part again. This proves they cannot diagnose the root engine failure and are only applying useless, temporary fixes. Prior to all 6 stalls, the flashing Check Engine / Hybrid Warning light triggered on the dashboard. This critical KSDS alert was followed within seconds by a total loss of motive power. Also, a history of rapid engine oil depletion and low-oil alerts was documented in 2 of the diagnostics.

NHTSA ID

11750679

Incident

Jun 22, 2026

Purchased 2019 after 44,000 miles engine was replaced metal in engine and inverter coolant issue July 2025 117,000 my inverter coolant light came in and off several times then car through all warning lights hev check engine warning shut it down went into limp mode Towed to dealership they checked and cleared codes said it threw 13 codes but after clearing they stated nothing wrong with it As they went to pull car around it happened again this time code was knock sensor which they relaxed at no charge extended warranty They next day after picking up while at idle hev warning went in shut car off and it was gone kept driving nonissues The next day again it happened and this time the engine light stayed on Spoke with dealership they said they would charge me diagnosis charge of 208 and if it was related to what they did. It would be covered also stated if the engine light was flashing it would be covered or it isn’t the engine isn’t covered The inverter coolant is not bubbling or moving when car is on it is an inverter coolant issue that was a problem back when my first engine was repaired and should be covered I love my vehicle but I have had so many issues since getting it major things and the lighting system showing a black spot in my view as well that could not be fixed I will attach pictures of earning lights and video of coolant not circulating and the dealership filled the coolant way over the top I have to now take it back again to have it looked at

NHTSA ID

11674772

Incident

Jul 13, 2025

When accelerating, the vehicle automatically hesitates and loses power. This happens when pulling out from complete stops as well as moving slowly to passing other vehicles. The tachometer still shows power but the brakes depress and there is no power to the vehicle and it hesitates feeling as if the ABS are kicking in. In order for it to resolve itself you have to let it run its course. The service departments at the dealer have felt it but can’t pinpoint an answer.

NHTSA ID

11451450

Incident

Oct 1, 2021

TL* THE CONTACT OWNED A 2019 HYUNDAI SONATA. WHILE THE CONTACT WAS PULLING INTO AN INTERSECTION, A SECOND VEHICLE CRASHED INTO THE FRONT DRIVER SIDE OF HIS VEHICLE. THE FRONT END OF THE VEHICLE WAS SEVERELY DAMAGED; HOWEVER, THE AIR BAGS DID NOT DEPLOY. THE DRIVER SUSTAINED BROKEN RIBS, AND INJURIES TO THE LEG, HEAD, AND ARM. MEDICAL ATTENTION WAS RECEIVED AND POLICE REPORT NUMBER: [XXX] WAS FILED. THE VEHICLE WAS DESTROYED AND TOWED FROM THE SCENE. BROADWAY AUTOMOTIVE (1010 S. MILITARY AVE, GREEN BAY, WI) AND THE MANUFACTURER WERE NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS 3,500. *DT ('PARTS OF THIS DOCUMENT HAVE BEEN REDACTED TO PROTECT PERSONALLY IDENTIFIABLE INFORMATION PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6).')*JB

NHTSA ID

11290285

Incident

Oct 10, 2019

Mileage

3,500 mi