Hyundai Sonata Hybrid knocking problems

Filed Oct 21, 2026 · Engine, Transmission · IN

1. It spun a main rod bearing. It is at the Hyundai Dealership in Evansville, In. 2. Loss or power in roadway. 3.Yes it has, by the dealership. 4.Yes, by the manufacturer & the Hyundai Dealership. 5. Yes, as I backed out onto the street all the dashboard lights came on and buzzers and alarms started going off. When I finally got the car in gear then I was able to drive it about 25 feet back into the driveway and I turned it off. I had to have it towed to the dealership and they would not stand behind the warranty for the engine & transmission.

Filed Oct 16, 2026 · Engine · CA

My 2017 Hyundai Sonata Hybrid suffered a sudden and dangerous engine failure matching the exact conditions of the federal safety agency Safety Recall 209 (Hyundai Campaign 209) for premature connecting rod bearing wear. The vehicle entered Limp Mode due to diagnostic trouble code P1326. The mandatory Knock Sensor Detection System (KSDS) software update was successfully completed on this vehicle prior to the failure. The vehicle is currently located at Hyundai of [XXX], where dealership technicians confirmed that the engine is completely failed and requires replacement. However, the dealership and manufacturer are actively refusing to perform the mandatory safety recall remedy, instructing me to pick up the un-repaired, hazardous vehicle. They are citing the vehicle's salvage title as the sole reason for denial. Under federal the federal safety agency regulations, a manufacturer cannot deny a safety recall remedy based on a salvage or branded title status unless the vehicle cannot be physically or safely repaired. This engine defect poses a documented fire and stalling hazard. I am filing this immediate complaint because Hyundai is violating federal recall mandates by attempting to discharge a vehicle with an open, dangerous safety hazard without completing the legally required remedy. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Oct 7, 2026 · Brakes, Electrical · CA

• the engine Hybrid electrical network & anti lock braking system (ABS) failed. The independent scan confirmed codes P136 (engine knock signal) U2093/U1004 ( hybrid control module communication loss) and C1614 (ABS CAN TIMEOUT). The vehicle is fully available upon request. • while driving at highway speeds on the freeway every single light on the dashboard suddenly lit up all at once & the vehicle immediately starting loading acceleration & propulsion power. This sudden loss of speed on a active freeway created a immediate severe hazard of a of a high speed for myself & other motorists. • Yes, the electronic faults components have been confirmed & documented by an independent service center (oreilly auto parts veriscan diagnostic report. 05621260920003155). • No the vehicle hasn’t been inspected by the manufacturer, police , or the insurance representatives. • there were no symptoms or warning lamps prior to the failure everything happened instantly while driving on the freeway when the entire dashboard illuminated at once & the power was lost the physical odometer reads exactly 138,764( (note the third party scanner printout manually estimated 152,000 due to a tool discrepancy but the true mileage is 138,764.

Filed Sep 25, 2026 · Electrical, Engine · CA

am writing regarding 43099808 Number with Hyundai My 2019 Sonata hybird se in limp mode with an active flashing P1326 knock sensor code. The dealership is using an automated system denial to try and charge me $2,110 for an EGR valve and air filter.I am officially challenging this diagnostic path. Mathematically and mechanically, an EGR valve or MAF sensor cannot generate the structural rod-bearing acoustic frequency required to trip a manufacturer-specific P1326 engine protection code.Furthermore, the tracy Hyundai certified my vehicle's warranty compliance and replaced my knock sensors under the KSDS campaign only two weeks ago. The fact that the P1326 code flashed again 14 days later proves the new sensor is successfully detecting an internal structural engine failure. I am requesting an immediate manual override and a field review by the District Parts and Service Manager (DPSM) for a full engine replacement under the terms of the lifetime class-action warranty.

Filed Sep 1, 2026 · Engine · 110,000 miles · CA

The contact owns a 2017 Hyundai Sonata. The contact stated that the vehicle experienced excessive oil consumption with an abnormal burning odor. The vehicle was taken to a dealer, and an oil consumption test was performed. The contact was informed that the vehicle passed the inspection. While driving later, the vehicle stalled and was taken back to the dealer, where it was determined that the vehicle was consuming an excessive amount of engine oil, and several DTC including the Knock Sensor Detection System (KSDS) were found. The contact stated that while driving or reversing at various speeds, the vehicle shuddered, made abnormal rattling sounds, entered HEV Lock Mode, and the vehicle stalled. The vehicle occasionally came to a complete stop in the middle of the road and had to be pushed out of the roadway. On other occasions, the driver was able to pull over to the side of the road. The vehicle failed to restart and was towed after stalling. The contact stated that the check engine warning light was illuminated before the vehicle entered HEV Lock Mode, with several unknown warning lights illuminated. The vehicle was towed to the dealer, where several tests, including bearing clearance tests and unknown repairs, were performed; however, the failure persisted. During the final service visit, the dealer diagnosed the vehicle with engine wear and tear and fractured pistons. The dealer determined that the engine needed to be replaced; however, the service manager informed the contact that there was no guarantee that replacing the engine or catalytic converter would resolve the failure due to severe engine damage. The vehicle was not repaired. The manufacturer was notified of the failure and offered loaner vehicle assistance on several occasions; however, coverage for the engine replacement was denied. The failure mileage was approximately 110,000.

Filed Aug 11, 2026 · Brakes, Engine · 147,000 miles · CA

The contact owns a 2013 Hyundai Sonata. The contact stated that while driving 40 MPH, the malfunction indicator and coolant temperature warning lights illuminated, and the engine overheated and shuddered abnormally. There was smoke and an abnormal ticking sound coming from underneath the hood of the vehicle. The contact was able to pull into a parking lot, and the vehicle was turned off. The contact became aware that the VIN was included in the federal safety agency Campaign Number: 23V651000 (Service Brakes, Hydraulic). The vehicle was not diagnosed or repaired by a dealer or an independent mechanic. The manufacturer was not notified of the failure. The failure mileage was approximately 147,000.

Filed Jul 15, 2026 · Engine, Fuel system · WA

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.

Filed Jul 19, 2025 · Electrical, Engine · WI

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

Filed Jun 10, 2025 · Engine · 183,000 miles · VA

The contact owns a 2017 Hyundai Sonata Hybrid. The contact stated while driving at various speeds, the contact noticed an abnormal ticking sound coming from the engine. There was no warning light illuminated. The vehicle was taken to the dealer, where it was diagnosed with engine failure due to the rod bearings failure. The dealer determined that the engine needed to be replaced and informed the contact that the repair was not covered under an unknown recall due to the mileage. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 183,000.

Filed Apr 10, 2025 · Brakes, Engine · 115,395 miles · NV · fire

The contact owns a 2015 Hyundai Sonata Hybrid. The contact stated that while driving 5 MPH and making a left turn, the vehicle made an abnormal knocking sound. The contact stated that upon pulling into an apartment complex parking lot, the contact noticed that there was smoke coming out from underneath the hood. There was no warning light illuminated. The contact immediately parked and exited the vehicle. The contact stated that upon opening the hood, the contact noticed a small fire and was able to extinguish the fire with a water bottle. The contact was able to push the vehicle into a parking space with the assistance of her son. There was no injury sustained. No police report was filed. The vehicle was towed to an independent mechanic, where it was diagnosed that a fluid leak from an unknown hose had caused the fire, and there was a hole in the engine block. The contact also stated that there was a puddle of fluid on the ground. The vehicle was not repaired. The contact became aware that the VIN was included in the federal safety agency Campaign Number: 23V651000(Service Brakes, Hydraulic), which the contact related to the failure. The dealer and the manufacturer were not notified of the failure. The failure mileage was approximately 115,395.