The contact owns a 2015 Hyundai Sonata. The contact stated while driving approximately 55 MPH, the vehicle inadvertently stalled. The contact stated that several unknown warning lights were illuminated. The vehicle was towed to a local mechanic where it was diagnosed with needing the engine replaced however, the vehicle was not repaired. The vehicle was then towed to the local dealer. The manufacturer was not informed of the failure. The failure mileage was unavailable.

- Denver, CO, USA

Sonata started having problems with less than 50,000 total miles. The accelerator is flawed and the vehicle cannot keep speed when traveling uphill or get to speed efficiently. The vehicle jerks for a few seconds when pressing the gas and the engine revs but the vehicle does not accelerate like it should. This has almost caused me to have accidents multiple times when pulling out into traffic. The check engine light came on when this started occurring and has been on ever since. I'm having the hyundai dealership take a look at the vehicle and see if there is anything that can be done.

- Youngstown, OH, USA

The contact owns a 2015 Hyundai Sonata. The contact stated that the vehicle was consuming an excessive amount of oil. The contact stated that the vehicle consumed two quarts of oil per week. Additionally, the vehicle made abnormal sounds and had lost motive power while driving. The check engine warning illuminated. The vehicle was taken to the dealer. The dealer replaced the oil pan gasket and made other unknown repairs; however, the failure recurred. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 80,000.

- Columbia, SC, USA

The contact owns a 2015 Hyundai Sonata. The contact stated that while driving at 20 MPH, the vehicle inadvertently stalled. The check engine warning light illuminated. The contact was able to veer to the side of the road. The contact stated that the vehicle restarted independently after a few minutes and she continued to drive. The dealer was notified of the failure and informed the contact that the vehicle was not included in any open recalls. The vehicle was taken to a local Pep Boys who diagnosed that the fuel system and fuel pump had failed. The contact stated that the failure reoccurred while driving on the highway at an undisclosed speed. The contact was able to push the vehicle to the side of the road with assistance. The vehicle was towed to the contact's residence. The manufacturer was not notified of the failure. The vehicle was not repaired. The failure mileage was approximately 137,438.

- Upper Marlboro, MD, USA

The contact owns a 2015 Hyundai Sonata. The contact stated that while driving at a moderate rate of speed, the check engine warning light started flashing on the instrument panel. The vehicle then began to stall as the vehicle would not shift above the first gear. The contact was able to coast the vehicle to the nearest independent mechanic where he diagnosed the vehicle with engine failure. Despite the failure, the contact was able to drive the vehicle home. The contact then called several dealers in her area and each one informed her that there were no recalls on her vehicle. The contact then notified the manufacturer but received no assistance. The vehicle had yet to be repaired. The failure mileage was approximately 100,000.

- Rialto, CA, USA

The engine is burning over 5 quarts of oil between 600 and 1000 miles. The engine is the 2.4 litre and it is doing the same as the 2014 and previous model. It is also known that the 2016 has the same issue. Hyundai refuses to replace the motor or cover any cost. They are saying that the car is out of warranty when it has been in the shop for oil consumption pre-mileage but they said it was normal to be a quart or 2 low. Now the motor will be empty by 600 to 1000 miles. The dealers wants to put chemicals in the motor at a cost of 200 plus with now promise of resolving the issue. In addition it has been proven that these quick fixes are catastrophic and will cost more than an engine maybe a life in traffic.

- Missouri City, TX, USA

During weekend road trip, on the way back, engine has developed knocking noise, unusual vibrations, and loss of power. Car was able to make it home at low speeds with minimal acceleration. Oil check revealed that all of oil was burned up over a few days, as the oil check before the weekend trip showed full levels. Dealer would not even accept looking at the car for over a month, before their first available appointment. Independent mechanic confirmed engine knocking, burned up oil. They recommended engine replacement, but were not able to complete the job as the company would not make replacement parts available to them. Dealer has finally accepted car, also confirmed knocking noise and burned up oil. It would take another month for dealer to produce a repair quote -- $14,000 for engine replacement and additional 2 months of wait time for some parts to arrive -- much higher than what I understand it typically costs for a full engine replacement, but the dealer is left as the only option to charge however much they want, as independent services are blocked from acquiring needed parts. 87,000 mi in just over 6 years of use. No warning lights on the dash. No OBD status codes. All together this would add up to at least 5 months of inoperable car, and what looks to be a very inflated repair bill. Dealer is recommending a purchase of a new car from them instead.

- Kirkland, WA, USA

Hyundai reprogramed their Theta engines to prevent an ongoing problem related to Theta engines not receiving oil to the crankshaft and connecting rod bearings. The software modification was done by an unknown software house. When I got the first notice, I asked both the local dealer, and the official Hyundai site if this software would cut power, potentially at the wrong time, like going up an entrance ramp. I got no response and I found out why. I tried entering a highway where traffic was at 75 mph. When I got onto the ramp the car was running fine. Suddenly the power just went away. I had the gas pedal all the way to the floor and watched the tachometer and speedometer go down rather than up. I pulled off at the next exit and switched the programming on my transmission to normal from econ mode. Up the ramp I went, and car started slowing down. Tried one more time using the sport mode and the power went away. I'm afraid to try and run on a freeway at rush our because of the lack of power. I think the needs to be a review of the software and see if changes can be made.

- Madison, WI, USA

Car engine light turns on indicating connecting rod bearing failure. Vehicle has stopped running properly while driving at high speeds & caused safety concerns. Issue has shown to be consistent across many other Hyundai vehicles. Issue has not yet been checked by manufacturer but is available for future inspection.

- Atlanta, GA, USA

The Camshaft Seals are defective and cause the engine light to come on and also I experience power loss while driving on the highway.

- Wilkes Barre, PA, USA

Vehicle info: 2015 Sonata Se. 97450 Mileage. As with most all complaints with this engine, it is deteriorating slowly as the knock sensor code P1326 has sensed a knock. A private mechanic has verified that a rod bearing is either bent or broken and knocking against the engine. This is after two Hyundai dealers have denied even inspecting my vehicle. Due to the title status of my vehicle (rebuilt title) Hyundai dealers (King Hyundai in Deerfield Beach, FL and Coconut Creek Hyundai in Coconut Creek, FL) are denying repairs because the engine has no active campaigns or recalls on the engine even though Hyundai Motors of America has extended the warranty to a lifetime duration for this exact issue. This is a huge liability situation as these engines are known to catch fire for this very issue and Hyundai/Kia has been fined $140 Million for not acting sooner on this matter. These vehicles have been known to catch fire inside the dealership service center while going through diagnostic testing by certified mechanics. I have had the Campaign 953 serviced in 2018, which was a software update to alert owners when the engine is already failing (sensing a bearing rod broken). This campaign did not address the faulty engine but only alert you. Hyundai Motor America has told me that a Hyundai dealership should not deny me warranty coverage however every dealership in Palm Beach and Broward counties are denying my service order approval. Service managers refuse to send in a pre-authorization to Hyundai Motor America despite corporates approval of this warranty coverage therefore nobody wants to take responsibility nor liability for a known safety defect in Hyundai engines.

- Delray Beach, FL, USA

The contact owns a 2015 Hyundai Sonata. The contact stated the vehicle was hard to start. After the vehicle was started, the started shaking abnormally. The check engine and ABS warning lights were illuminated. The vehicle was taken to an independent mechanic who informed the contact about the engine combustion. The vehicle was towed to the local dealer where it was diagnosed that oil was leaking onto the spark plugs. The vehicle was not repaired. The manufacturer was notified of the failure however, no further assistance was provided. The approximate failure mileage was 124,000.

- Hinesville, GA, USA

The contact owns a 2015 Hyundai Sonata. The contact stated that the vehicle was consuming an excessive amount of engine oil. Upon inspection, the contact noticed there was no oil on the dipstick. The vehicle was taken to the independent mechanic and diagnosed that there was no oil in the oil reservoir. The mechanic added four quarts of oil to the oil reservoir and referred the contact to the dealer. The dealer was made aware of the failure and scheduled an upcoming appointment for an oil consumption test. The vehicle was not repaired. The manufacturer was made aware of the failure and a case was opened. The failure mileage was approximately 113,000.

- Graham, NC, USA

Driving my sonata in town 40 miles per hour got to a light and check engine light started flashing I pulled over and parked it in an advanced auto parking lot parts man come out put scanner in car and read code p00137 knock sensor so I had it towed to home due to I called hyundai and mechanic said it would be around the 16th before he could look at it. I tried to start cat again and would not crank I went on line and jumped car from relay and motor is seized up. Have about 135,000 miles roughly and now looking into problem car drinks oil like fierce and now motor is bad

- Havelock, NC, USA

Out of the blue, I heard a very loud knocking noise coming from my engine. I was driving my children to school and as I hit the gas pedal the less power my car had. Not only would it not accelerate much but even the lights would dim. I am now paying over $400 a month for a car that I can not drive and walking where I need to go. My vin number does not qualify me for the engine recall Hyundai has, even though my car is the right year, make and model, engine size and problem that the recall is for. Awesome right?

- Urbana , OH, USA

The car caught fire. I only had the car for 3 weeks. I had just started the car for work. There were no warning lights on. If some unknown guy have not told me to get out my car i would had died.

- Not Hispanic, OH, USA

While traveling on the interstate, the car started shuddering. Pulled off and went to auto part store and they read the code #4 misfire. Took car to my mechanic and he said #4 cylinder was dead. Proceeded to take car to dealership and they said #4 cylinder had burn valve with hole in valve. We hey gave a quote for engine replacement. Took car back to my mechanic and he replaced engine at a cost of $5466.28. The replacement engine was a 2014 with 13k miles. The car only had 107186 miles at time of incident.

- Hazel Green , AL, USA

Check engine light on. Taken to hyundai dealership for recall repairs. At the time, 3 recalls on vehicle. Informed that check engine light was on due to recalls. Dealership kept car for 1? weeks and notified me that 1 recall (filter) was not completed because parts are on back order. Dealership had me pick up vehicle and said that it is okay to drive car; however, after calling another Dealership, the Service rep informed me that cars should not be driven while engine filter recalls are open because it could potentially further damage vehicle. Vehicle has now been sitting in my garage for over 2 months and I'm making payments for a car I cannot drive.

- Bakersfield, CA, USA

The connecting-rod bearings in the engine damaged. I've read that it was a recall problem in hyundai's engines. i have abnormal knocking noises from the engine, reduced power or hesitation, illumination of the "check engine" light.

- Detroit, Mi, Usa, MI, USA

The contact owns a 2015 Hyundai Sonata. The contact stated while driving approximately 75 MPH, the vehicle began to vibrate violently. The contact pulled over and had the vehicle towed to a local dealer where it was diagnosed with needing a new transmission. The contact stated that the check engine warning light was illuminated. The manufacturer was not informed of the failure. The failure mileage was approximately 124,000.

- Greenacres, FL, USA