2023 Hyundai Sonata Fuel System

The contact owns a 2023 Hyundai Sonata. The contact stated that after depressing the START/STOP button, the vehicle failed to start immediately. Additionally, there was smoke coming from the exhaust pipe. There was no warning light illuminated; however, an undisclosed message was displayed. The vehicle was towed to the dealer, who replaced the fuel injector; however, the failure persisted. The vehicle was not repaired. The contact related the failure to NHTSA Campaign Number: 25V796000 (Fuel System, Gasoline); however, the VIN was not included in the recall. The manufacturer was made aware of the failure. The failure mileage was approximately 56,000.

The contact owns a 2023 Hyundai Sonata. The contact received notification of NHTSA Campaign Number: 25V796000 (Fuel System, Gasoline); however, the part to do the recall repair was not yet available. The local dealer was not contacted. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue and informed the contact that parts were still not yet available. The manufacturer referred the contact to the NHTSA Hotline to report the issue. The contact had not experienced a failure.

The contact owns a 2023 Hyundai Sonata. The contact stated that while driving at an undisclosed speed, the check engine warning light illuminated. The vehicle was taken to the dealer several times, and the dealer reset the check engine warning light. In addition, the vehicle remained with the dealer for 32 days but was not repaired. The vehicle was not repaired, and the failure reoccurred. The contact received notification of NHTSA Campaign Number: 25V796000 (Fuel System, Gasoline); however, the parts were not available for the recall repair. The manufacturer was made aware of the failure. The contact was informed that parts were not yet available. The failure mileage was approximately 28,000.

The contact owns a 2023 Hyundai Sonata. The contact stated while driving at various speeds, there was a loud sound coming from the rear end underneath the floorboard like a part slamming on the undercarriage of the vehicle. The contact stated that the fuel gauge suddenly indicated that the fuel tank was EMPTY. The vehicle was taken to the dealer who diagnosed that the gas valve and electronic control unit (ECU) had failed. The contact stated that the gas valve was replaced, and the electronic control unit (ECU) was updated. After receiving the repair, the contact noticed that while attempting to accelerate, the vehicle downshifted before shifting to the desired gear and accelerating. The failure was most persistent while driving uphill. The check engine warning light was illuminated. The vehicle was taken to another dealer, All Star Hyundai (3950 Century Ct, Pittsburg, CA 94565) who was unable to diagnose the vehicle due to not having the tool necessary to detach the fuel tank. The vehicle was then taken to another dealer, San Leandro Hyundai a Carnamic Car Center (1066 Marina Blvd, San Leandro, CA 94577) who diagnosed that the pressure valve was swollen and the entire fuel tank and pressure valve needed to be replaced. The vehicle was not repaired. Due to the inconsistency of diagnostic results, the contact decided to take the vehicle to another dealer, Fremont Hyundai (43690 Auto Mall Cir, Fremont, CA 94538) who diagnosed that the pressure valve was swollen but had not diagnosed that the fuel tank needed to be replaced due to not finding a failure with the fuel tank. The manufacturer was not made aware of the failure. The failure mileage was approximately failure mileage was 75,000.

The contact owns a 2023 Hyundai Sonata. The contact stated that while driving at 35 MPH, the fuel mileage abnormally increased from 320 to approximately 431. An unknown message was displayed, and the contact received a notification on the Mobile App about a diagnostic trouble code for the EVAP sensor. The vehicle was taken to the dealer, where it was diagnosed, and determined that the EVAP system valve was stuck open. The dealer replaced the EVAP system, and the dealer then determined that the fuel tank was swollen due to the failure. The contact stated that the rear seat sensor was malfunctioning and was causing a warning light to illuminate erroneously, which the dealer related to the fuel tank swelling and lifting the metal underneath the seat. The dealer also replaced the fuel tank. The vehicle was repaired. The manufacturer was notified of the failure and covered the repairs. The failure mileage was approximately 73,245.