While driving on the highway I noticed a knocking sound radiating from my engine at speeds of 60 mph it the noise increased and then the engine appeared to be failing. My gages where the rmp's reflect where not functioning either. Amongst the engine issue my power steering column is also rattling as if it is loose and steering is become difficult. It is frightening to not feel safe in your own vehicle.

- Camden, NJ, USA

My certified pre-owned Sonata hybrid was not under the class action recall but has twice now had the same engine failure as the sonatas that have been recalled. First engine failure- car was at dealer from Nov 2015 to Jan 2016 and engine was rebuilt. Second engine failure, related engine issue- Dec 2017 to current time. It is very dangerous, car stalled while driving on a major state road and entire system seized up, could not even go into neutral. Second time, oil spattered all over engine and oil light came on while on state highway- major leak on engine mount. First repair indicated the same particles in engine that caused engine to seize as the recalled sonatas though my VIN was/is not included in class action settlement nor under that official recall. Car still not repaired after 2 months at dealer this second time. Have gone back and forth with Hyundai motor regional customer complaint, local dealer and warranty company for last 2 months with no resolution and still no car.

- Jupiter, FL, USA

Check charging system warning comes on. Have brought to dealership twice but they do not know what is wrong.

- Selden, NY, USA

Had to replace engine due to serious engine malfunction.

- Kennesaw, GA, USA

This vehicle Hyundai Sonata hybrid has all the issues that the regular Hyundai sonata recalls have engine was rebuilt due to metal shavings in the oil pan, also this hybrid accelerates at times when it doesnt run on battery (engine kicks in) too many issues with this Hyundai Sonata hybrid!!! in motion on highway/ city streets

- Somerville, NJ, USA

I had engine failure on my 2011 sonata the car was sold to me at 119K miles on 02/2016 in 03/2016 the engine light came on the dealership would not trade the car in because it was as is they knew about the recall on the engines at the time that I returned the car to the dealership but did not advise me. Now the engine is gone and they will not cover the parts or labor becasue I am over 120K miles the repairs are 7800 I am unable to drive the car

- Chesapeake, VA, USA

Check charging system and check brake light came on at 76000 miles driveing 65 mph in the highway after 3 hours. Collant did not read hot, battery read dead. Vehichle quickly decellerated and I pulled over. Radiator blew neck off and several components of the cooloing system and hoses were melted there is a strong smell of fludge/fule based residue/combustion in cooling system that blew off neck. Battery so week I could not use the key to open a door or the trunk, or move seats. Coolant had just been topped of and system was flushed within 10,000 miles. Mechanic at Kia dealership diagnosed tgat tge gead gasket/cylinder head leaded into the cooling system causing the neck to blow off the radiator and melting several sensors and components of the cooling system that would not have melted or blown from fumes of low coolant alone. Oil levels and quality was good. I photographed the dash lights at breakdown and the coolant levels did not read hot. Check charging system and check brake lights came on. Check brake lights check engine lights had been a problem before. Dealership for Hyundai (coggins Hyundai in deland) says they think a lack of coolant caused issue, but I know I had coolant in the car - they just want to not be responsible for warranty repair, as I am the first owner and have done proper maintainance. I have seen many other people complain of similar issues from when the car is new (check chargins system less than 3000 miles) and the car blowing up/catching fire, etc. Perhaps the reason mine did not catch fire was all the coolant that was released. One car owner insists that all Hyundai will do this between 70,000 and 100,000 miles. Something big is going on with these cars - mine has had continual problems and it should be replaced at huyndai's cost. This should be studied further! safty hazard! read Hyundai forum and the other complaints!

- Miami Beach, FL, USA

Charging system malfunctioned, sensors melted in valve trane, radiator elbow and fill neck blew off, complete engine failure and battery failure. I have had a problem with the "check brake" light and an alarm going off. However, when I stopped driving and had it towed to the dealership they could find nothing. Prior to this incident, I took a photo of my dash, I had 76,499 miles and the coolant meter did not read hot. I had had the coolant system flushed at 65,000 miles, and I had all oil and fluids checked again after this incident. The breakdown: Three hours into a roadtrip, the A/C began blowing warm, simultaneously - the "the check brake" light and alarm came on, and the "check charging system" light came on. I lost power to accelerate (or brake well) and immediately pulled over and took a photo of my dash warnings (76919 miles). The heat sensor was in the "cool" half, the battery gage showed no power. Battery so low key would not start car. I had the car towed. "tech found that elbow and radiator have holes in them vehicle overheated causing engine to blow." Tiffany richardson said "tech believe vehicle was driven with low coolant level causing vehicle to run hot melting sensors in the valve train and the pipes to fail." The tech is wrong, the coolant system was inspected and flushed at 65,000 miles, and was not due for another inspection. I had had coolant levels checked less than 1000 miles ago, and the heating sensor on dash did not read hot, at the point of breakdown or after a road trip 500 miles ago. Others had the problem at 3000 miles! it's the hpcu. The power for both electric motors is routed through hpcu. The inverters allow the A/C motors to be driven by D/C batteries. This caused "check charging system" error. This is $15,000 and I owe $4000 on the car - 100,000 warranty has denied it & I am original owner. Airbag

- Miami Beach, FL, USA

Charging system malfunctioned, sensors melted in valve trane, radiator elbow and fill neck blew off, complete engine failure and battery failure. I have had a problem with the "check brake" light and an alarm going off. However, when I stopped driving and had it towed to the dealership they could find nothing. Prior to this incident, I took a photo of my dash, I had 76,499 miles and the coolant meter did not read hot. I had had the coolant system flushed at 65,000 miles, and I had all oil and fluids checked again after this incident. The breakdown: Three hours into a roadtrip, the A/C began blowing warm, simultaneously - the "the check brake" light and alarm came on, and the "check charging system" light came on. I lost power to accelerate (or brake well) and immediately pulled over and took a photo of my dash warnings (76919 miles). The heat sensor was in the "cool" half, the battery gage showed no power. Battery so low key would not start car. I had the car towed. "tech found that elbow and radiator have holes in them vehicle overheated causing engine to blow." Tiffany richardson said "tech believe vehicle was driven with low coolant level causing vehicle to run hot melting sensors in the valve train and the pipes to fail." The tech is wrong, the coolant system was inspected and flushed at 65,000 miles, and was not due for another inspection. I had had coolant levels checked less than 1000 miles ago, and the heating sensor on dash did not read hot, at the point of breakdown or after a road trip 500 miles ago. Others had the problem at 3000 miles! it's the hpcu. The power for both electric motors is routed through hpcu. The inverters allow the A/C motors to be driven by D/C batteries. This caused the "check charging system" error. This is $15,000 and I owe $4000 on the car - 100,000 warranty has denied it & I am original owner.

- Miami Beach, FL, USA

Metal shavings in engine oil pan causing engine failure, knocking, lose of power while driving, manufacturing defect on small block engine but not on the small block hybrid... we were told by the dealer but the hybrid still has the same defect as the none hybrid same exact issues metal shaving in oil pan defects from manufacturer. The none hybrid was recalled but a recall was never issued for the hybrid stated by employees at global auto mall in New Jersey.

- Somerville, NJ, USA

The contact owns a 2011 Hyundai Sonata hybrid. While driving approximately 75 mph, the vehicle stalled without warning. The contact had to coast the vehicle to the side of the road. The vehicle was towed to the dealer where it was diagnosed that the engine needed to be replaced. The repair would not be covered under warranty or per a recall. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 75,000. Updated 07/27/16 the consumer stated metal shvings were found in the engine. Updated 08/01/16.

- Haughton, LA, USA

I was driving my 2011 Sonata hybrid down a interstate at 75 miles an hour when it stopped accelerating/working. I had my 3 year old daughter in the car with me at the time. I had to swerve to avoid an accident and was able to find a safe spot to park. I waited for 1/5 hours for a tow truck to come. After dropping my car off with the Hyundai dealership I was told my engine seized and I would need a new one for $9,000. This is completely ridiculous. My care has $75,000 and I am the second owner. The recall right now does not include hybrid/Korean made models of the 2011 sonata, so Hyundai states they will not pay for any repairs. I am perusing legal action in the hopes to have this problem identified. My daughter and I could have been killed, and many other owners are at risk.

- Haughton, LA, USA

Drove down the road to the store and turned off the car and when I came out to turn the car on and go home the car would not start, the issues that were happening were, the light would flicker on and off, the brake pedal was pumping in and out under my foot on its own, and the car would not start, after trying a few times the whole car and system shut down completely and the hazards started to come on automatically and there was no power to the automatic door locks and window and the only things working in the car was the anit-theft system

- San Diego, CA, USA

We were driving on I81N in Virginia when it sounded like we were driving over gravel.I thought it could have been a tire. Found tires were ok. Waited to pull out safely. Seconds after we entered I81N, we began to lose power, A/C and a warning light indicating to check hybrid system came on in message board. We pulled off at exit 277N and had enough power to find a safe place to pull over.I discovered that the serpentine belt was shredded. We were towed to a Hyundai dealer where the car sat overnight on 9/6/15 until service opened on 9/8/15. The serpentine belt was replaced as well as the water pump belt which was also damaged. The mechanic informed me the new belt was not running true on the tensioner and a ridge had formed on the outside surface of the tensioner. My opinion is that the part was defective because the belt was not running true.

- Gibsonia, PA, USA

The contact owns a 2011 Hyundai Sonata hybrid. While driving at 35 mph, the check engine warning indicator illuminated. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 10,500.

- Columbus , OH, USA

I was driving on the highway on my way to work when my sonata started making a strange noise. I pulled over to the side of the highway, turned off the car, and tried to restart it. It would not restart and the temperature gauge went up. There was no indication that there was an issue with the car (warning lights or other noises) prior to this incident. I was stuck on the side of a busy highway for 1.5 hours waiting for a tow to the dealer. The engine seized and needs to be replaced. Now Hyundai isn't honoring their warranty and saying its neglect, getting a second opinion.

- Ellicott City, MD, USA

I have had this 2011 Hyundai Sonata hybrid in the shop since I purchased it in 2011 new the car has serious car hesitation and gas mileage is 19 to 30 per gallon. I have had numerous problems with oil leaks and ended up with a blown motor at 60,000 miles. I also have numerous service issues with the blower ac/ heater not working as well. The car is a lemon after 30 visits to dealership for repeated problems. I have taken car to 4 different dealerships to have a new set of eyes fix the problems and stuck with a rebuilt motor in May 2015. Car is back in the shop for hesitate and ecs problems as of June 2015. Need help.

- Midlothian, IL, USA

The contact owns a 2011 Hyundai Sonata hybrid. The contact stated that while driving approximately 35 mph, he attempted to brake and all the warning lights illuminated. The contact also stated that the vehicle stalled and could be restarted. The failure recurred on fifty occasions. The vehicle was taken to a dealer where it was diagnosed that the transmission, the electric motor, and the oil pump needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 66,000.

- La Mirada, CA, USA

The car suddenly started chiming loudly, the check engine light lit up, a second light lit on the dash and a warning message that said to check the charging system appeared on the console. The car became near impossible to operate: Limited acceleration, jerked repeatedly trying to stop in a safe location, lost power to ac system....dangerous situation if other traffic had been nearby. The car is now inoperable as we wait for a tow to take it to the nearest dealer.

- S. Charleston, OH, USA