Hybrid Propulsion System Problems of Hyundai Sonata Hybrid

The contact owns a 2012 Hyundai Sonata Hybrid. The contact stated that while driving at an undisclosed speed, the vehicle lost motive power and the low battery warning light illuminated. In addition, the contact heard a rattling sound coming from the engine before the engine seized. The vehicle was towed to the dealer where it was diagnosed with a failed hybrid system and that the hybrid system needed to be replaced. The contact was also informed that the transmission was not the original transmission, and the cooler was damaged. The manufacturer was not made aware of the failure. The failure mileage was approximately 145,000.

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The contact owns a 2015 Hyundai Sonata Hybrid. The contact stated while stopped in traffic, the vehicle independently jolted with a message indicating a hybrid system safety failure. Additionally, there was a message to stop driving the vehicle with an alarm sounding. The contact veered to the side of the road. The contact was able to continue driving. The contact received notification of NHTSA campaign number: 23v651000 (service brakes, hydraulic) the following day; however, the part to do the recall repair was not yet available. The contact stated that the failure recurred while driving. The contact veered to the side of the road. The vehicle was then taken to an independent mechanic, where it was test-driven; however, the mechanic was unable to duplicate the failure. The local dealer was contacted and informed the contact that the earliest availability was on December 23, 2023. The vehicle was not diagnosed or repaired. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not made aware of the failure. The failure mileage was approximately 97,500. VIN tool confirms parts not available.

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The contact owns a 2016 Hyundai Sonata Hybrid. The contact stated while driving approximately 60 mph, the check engine warning light illuminated, and the message "check hybrid system, turn off the engine" was displayed, and the vehicle was shaking while decelerating. The vehicle was towed to the dealer where it was diagnosed with the technical service bulletin: 198. The technical service bulletin was completed; however, the failure recurred. The vehicle was towed to the same dealer where it was diagnosed with a drained battery and catalytic converter failure. The vehicle was repaired; however, the failure recurred. The vehicle was towed to the same dealer. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 147,000.

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The contact owns a 2016 Hyundai Sonata Hybrid. The contact stated while driving approximately 55 mph, the vehicle was shaking. The hybrid battery, phev system, and check engine warning lights were illuminated. The vehicle stalled. The vehicle was towed however, the independent mechanic was unable to determine the cause of the failure. The vehicle was then towed to the local dealer, who diagnosed a failure with the engine and catalytic converter. The engine was replaced. The failure reoccurred. The manufacturer was notified of the failure. The approximate failure mileage was 120,000.

The contact owns a 2012 Hyundai Sonata Hybrid. The contact stated while driving at various speeds, the vehicle hesitated and stalled while depressing the accelerator pedal. There was no warning light illuminated. The contact had taken the vehicle to multiple independent mechanics who were all unable to diagnose the failure due to no warning lights illuminating on the instrument panel. The contact then had the vehicle towed to the dealer where the mechanic was also unable to diagnose the failure. The mechanic informed her that the transmission needed to be replaced. The vehicle was not repaired. The failure mileage was approximately 130,000.

Tl the contact owns a 2014 Hyundai Sonata Hybrid. While driving approximately 25 mph, a warning chime sounded and "hybrid system warning" appeared on the instrument panel. The vehicle decelerated as if the brake pedal were depressed. The contact pulled the vehicle over to the side of the road and turned off the vehicle. After attempting to restart the vehicle a few times, the failure went away. The contact stated that the failure occurred sporadically for a month and was becoming worse. The vehicle was not taken to the dealer or an independent mechanic for diagnostic testing. The manufacturer was not notified of the failure. The vehicle was not repaired. The approximate failure mileage was 146,388.

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