I was driving to work Friday 12-6 at approx. 7:24am and the check engine light comes on and flashing. I then pulled over to see what was wrong and I turned the car off and back on the car will then only accelerate to 10 mph then slowly accelerate but will not go past 63. I was able to drive it back to a mechanic who then diagnosed it and stated it was a P3126 obd-II diagnostic powertrain (P) trouble code description P3126 engine trouble code is about exhaust gas recirculation sensor B circuit high. Reason for P3126 code the reason of P3126 obd-II engine trouble code is engine oil temperature sensor malfunction. P3126 code on vehicles with electronically controlled automatic transmissions, the 3-4 shift solenoid is responsible for actuating the hydraulic circuits to activate clutches or bands that change gears inside the automatic transmission.contacted Hyundai and justin asked me was the check engine flashing I advised him yes. He said it was more than likely a recall. He made me an appt for Tuesday 12-10 @ 7:15am. I proceeded to drive my vehicle to Hyundai and I was told it's not a recall and they are going to charge me $175 just to diagnose the problem. I drove it back to my job in flowery branch ga and contacted geico to tow it back to my house.

- Clarkesville, GA, USA

Engine knocking, checked the oil and it was fine. Drove it straight home which was about three miles. The next day I was driving it to work and the knocking was getting louder and louder, pulled over, checked the oil and it was sludge. Took it to grease monkey, which was directly across the street from where I was. They changed the oil and put an engine cleaner through it. Still the same. They took a look at it and said that the engine is seizing. I always maintained the car and no warning lights ever came on until after the oil change, then the check engine light came on. Mileage around 113,000 when this happened.

- Phoenix, AZ, USA

The engine consumes extraordinary amounts of engine oil. At 72,000 miles, over 70% of engine oil is lost between an oil change range of 7500 miles. Radiator fluid levels drop as well. I believe the engine has internal problems that lead to engine oil and radiator fluid to enter the combustion chamber. This has been the case since very early days and was also reported to us by other service centers. It has gotten worse over time.

- League City, TX, USA

The contact owns a 2015 Hyundai Sonata. While driving 80 mph, the vehicle seized without warning, lost power, and jerked. The contact managed to veer to the shoulder of the road where the vehicle lost complete power. When the vehicle was turned off and restarted, it resumed normal operation. The vehicle was taken to lithia Hyundai of odessa (5000 john ben shepperd pkwy, odessa, tx 79762, (432) 614-0345) to be diagnosed, but the results were unknown. The dealer stated that they did not have parts to repair the engine. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 96,000. The VIN was unknown.

- Danvers, TX, USA

Engine has to many recalls did all of them. Engine staring shaking and burning oil and consuming fuel. This vehicle could be a hazard or can stop in middle of highway and provoking accident or death.

- Burke, VA, USA

Car, hybrid, died at a light. Warning light and buzzer alarm !charging system error do not drive. Was able to restart car. Stopped at a store, let it sit. Restarted again engine light stayed in got home where I was temporarily staying, waited a few hours restarted no warning lights.was a Friday, messaged service mgr, he was off called Monday car brought in Tuesday. Error code off on board diagnostics was P1B70. They loaded software update 19 hc 002H service bulletin. Car 2015 this problem was a issue with earlier years..still around unfortunately. Should have been a safety recall..cars are dying while driving. Dealer expressed opinion that this should resolve issue if not call immediately.

- Sunrise, FL, USA

The car suddenly lost power during the city drive, by the same time, engine light was on. The acceleration pedal does not work properly, (envn with the pedal all the way to the floor, it is around 30K RPM with ~30 mph, and the car didn't running smoothly (hesitate to move). Shut down and start again. Everything is back to normal, just the engine light is still on. This is recurring problem, it is been the fifth or sixth time start from the second of the ownership (~8000 miles). Everytime take the car to dealership, they told me did not find anything wrong and car computer was updated (I guess they mean the engine light code was cleared)

- Glendora, CA, USA

My vehicle rattles and knocks all the time. It has a little over 65000 miles and has done this for years. I have taken it to the dealership and told it supposed to sound like that. The car has no power what so ever climbing hills and my gas mileage keeps going down. I have heard this is a common problem but I want it fixed as I dont fee this car is reliable as it has quit running one time before because of this problem. Something needs to be done before someones car cuts off and causes an accident and someone get killed. It does this anytime you give the car throttle. The second thing is the poor stitching in the leather seats. My seats started coming apart at the seams and the dealer says its not covered under warranty but I purchased a full 10 year 100000 mile warranty. This is poor materials and workmashipl I drive the car about 14 days a month and it shouldn't already have a coming apart.

- Spanish Fort, AL, USA

Engine tapping, knocking noise by the pistons Hyundai recall for software upgrade then two months later engine went into protection mode max speed only 57 mph so they change knock sensor then 5 days later back to Hyundai with same problem engine running in protection mode with the blinking engine light again this is the third time. Knock sensor worked find the first time because something happen with the knew one. The car was in motion on every case engine is no good.

- Cave Creek, AZ, USA

The contact owns a 2015 Hyundai Sonata. While driving, the vehicle lost power and made a knocking and ticking noise. The noise occurred from the engine during acceleration and the check engine warning indicator illuminated. The contact was able to drive the vehicle home. The following day, the vehicle was towed to napleton Hyundai of carmel (4200 E 96th St, indianapolis, in 46240, (844) 729-4217) where it was diagnosed that code: P1326 (knock sensor activation) failed and needed to be replaced. The technician replaced the knock and torque sensors. After the vehicle was repaired, the check engine indicator illuminated again. The vehicle was taken back to the same dealer and the engine was replaced; however, the check engine indicator continued to illuminate. The vehicle was taken back to the dealer where unknown parts were ordered and replaced on the vehicle. The manufacturer was made aware of the failure and provided case number: 16277030. The failure mileage was approximately 51,000.

- Indianapolis, IN, USA

On October 8, 2019, I was driving on hwy 285 in Georgia, when my Hyundai Sonata began to reduce its speed despite me pressing the gas. As I attempted to get to safety, a warning light flashed 'transmission hot..stop'. there was no warning other than that light that popped on at that moment. While driving through an intersection my car completely turned off. I made several attempts to restart with no luck. There was no prior warning and I maintain regularly oil changes. I had to have the vehicle towed to a local Hyundai dealership, where I was told that my motor/engine needed to be completely repaired. When I asked what the cause was, I was informed that my 3rd piston had exploded and damaged the motor to the point of needing replacement. The mechanic stated that it was not know why this occurred. I was also instructed that the manufacturer was no longer making the motor that I have in my car and I would not to purchase a used one. This would cost me approximately $5000 at the least. I have only had this car for less than two years and requiring a new motor is unbelievable. The mechanic shared that I was lucky that the car did not catch on fire while I was driving it.

- Douglasville, GA, USA

At 45,800 miles my Sonata could not reach 60 mph and the RPM could not reach 2000. I also noticed the gas mileage drops the Sonata had 35,000 miles on it. I took the car to the dealer and was told it needs new engine.

- Alhambra, CA, USA

While driving 30-40 mph the car turn off.. for no reason.. I have always done maintenance on the car from dealership. Just put in a new battery.. and car turn off.. this has happened 2 times

- Milpitas, CA, USA

I've been having an oil consumption issue on my vehicle. I've been getting my oil changed on time regularly & the oil seems to burn off extremely faster than it should. Every time I get my oil changed I've been told that there aren't any leaks. Now my check engine light is on & my engine is shaking. Ive only had my car for 3 years & my air bag light came on out of no where. Also my gear shift seems to lock up & wont release from park to drive

- Glenwood, IL, USA

We purchased our 2015 Sonata limited in June of 2018 with just shy of 59K miles. In August of 2019; and at 66K miles; our vehicle started producing a knocking noise; with a flashing "check engine" light; and would not accelerate. Since August of 2019, our Sonata has been in the dealership service department 3 times; and for a consecutive 30 days. We were told with the first time in the shop that the vehicle needed a new sensor; which was repaired within a day. When my husband returned to the dealership to take the car home; he barely made it a mile from the dealership before the car started repeating the same issues. The vehicle was immediately returned to the dealership for repairs. The second time we picked up the vehicle; we made in nearly 20 miles back toward home before the car died again. The third time into the dealership; and they finally determined that the engine had failed and required replacement. During this whole mess, we learned that we were experiencing the catastrophic engine failure that is associated with Hyundai's defective 2.4L theta II engines. We have brought this to the attention of Hyundai motor America. They originally offered to buy it back for $4K less than we owe on it; and continued to move us from one representative to the next. As of today, Hyundai has suddenly changed their mind and refuse to buy the car back. Hyundai has produced an unsafe & defective vehicle; prone to potential engine fires; engine failure; transmission issues; seatbelts that don't function properly; and power steering issues. Hyundai refuses to take full responsibility for their unsafe & defective product. We no longer feel safe driving the vehicle (which is still in the shop, btw); and no longer trust it to be reliable.

- Chandler, AZ, USA

Takata recall. My 2015 Hyundai Sonata lost power while I was driving. I took to mechanic and they say my motor locked up. My car only has 76000 miles

- Cartersville, GA, USA

I must start by saying that english is not my first language, Korean is and I would like a translator when I am called for reference. On 07/16/2019 I purchased a 2015 Hyundai Sonata from carvana and have run into the following problems: The battery was not the correct size for that model car, the engine air intake was completely missing, and the supercharger blew up 4 days after I bought the car. I have sent an email to carvana but never received a response. I have more documents pertaining to this matter that are too large to attached and will be able to send them via email.

- Gainesville, FL, USA

Driving my car on the hwy and totally lose all power and im driving 70 mph....lucky no one was behind me at the time but this isn't safe at all...this is my second Sonata that this has happened to and im really afraid to drive these cars... also the car started smoking under the hood.

- Lexington, KY, USA

I purchased my 2015 Hyundai Sonata recently with only 46K miles on it. After 3 weeks, the engine started clicking loudly and it literally sounded like a roller coaster being pulled uphill when under load. A week later the ticking was constant. My husband changed my oil and strained it, finding small metal fragments in the oil. These fragments are from an engine defect that Hyundai even admits having. Now as the second owner, I have no service records prior to ownership and my warranty claim was denied because of it. How can this be happening" Hyundai admits defect but are still allowed to rip off consumers with bad engines" the gdi Hyundai engines are defective and it cost me $3,000!

- Euharlee, GA, USA

Hi NHTSA, I drive a 2015 Hyundai Sonata and followed all the recommended maintenance. I started to notice my oil level was below low after 2000 miles at 47000 on the vehicle. I thought it was not filled correctly and had my mechanic check it. Also, I told my Hyundai dealership in laurel, md about the finding. I decided to top off my oil and closely monitor the status. On my next oil change, after 2000 miles my oil was low again. I add roughly 1.5 qts to top it off. I brought my car until Hyundai for an oil consumption test. The mechanic did not note how much oil he started as the baseline; however, the dip stick was over the full mark. After 3000 miles, my oil was at the low level. Per Hyundai owner manual, I can drive 7500 miles between oil changes with non - extreme driving. Hyundai stated my car was not consuming oil, and this is normal.

- Laurel, MD, USA