Hyundai Sonata Complaints (2021)

190 consumer complaints on file.

#11609725August 20, 2024
ENGINE
Coolant leak acting like blown head gasket. Coolant was leaking into the exhaust system. Defective EHRS system
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11608129August 12, 2024
UNKNOWN OR OTHER
The car randomly loses power and stalls on the expressway and it states that something is wrong with the hybrid system
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11607660August 9, 2024
POWER TRAIN
Issue with DCT transmission. Unknown remedy
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11606204August 2, 2024
UNKNOWN OR OTHER
UNKNOWN Wednesday 7-3-24 I was driving on an interstate at night, going approximately 74mph and my car totally powered down and powered back on with no warnings. Everything on the dashboard and display screen went black. This was totally random and has never happened before. I’m a second owner, previously owned by a rental car corporation. I have no idea if there has been previous recalls that have not been repaired or not.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11603500July 19, 2024
ELECTRICAL SYSTEM, VISIBILITY/WIPER, STRUCTURE:BODY
The vehicle, after parking, is nonresponsive to the key fob, nor will it start. This can happen at anytime and anywhere. Dealer said "It is possible the integrated 12v battery into the hybrid battery may be faulty. No codes or tests can confirm the issue. The dealer said the key fobs tested ok." My wife works late at night in a dark area, this has happened 2 times at her place of work and we are concerned for her safety as she has to wait outside for a tow truck to tow it to the dealer. The first 3 times it occured, this issue started around march of 2024, and repeated every 30-45 days. Now it has happened 2 more times in the last week. No warning lamps or indications of problems. The windshield has distortion within the glass and is not a clear view. It is as though you are looking through the heat of a jet engine trying to focus on what is on the other side. This is a major distraction while driving, reading the heads up display in the car, reading street signs and general navigation of pedestrian and other vehicle traffic. There is no aftermarket film or materials on the windshield. The door handle on the drivers side has a cover plate over the hole where a manual key could be inserted. As a construction worker I have very strong hands and I have a difficult time removing the cover plate. The last time I removed the plate I cut my hand on the interior part of the handle as the cover plate popped off. That is how hard the plate is to remove. My wife cannot remove the cover plate on her own. This system is in place for the manual use of the hidden key inside the key fob to be able to open the door in the event of a power failure of the vehicle. which has now happened randomly 5 times.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11603481July 19, 2024
FUEL/PROPULSION SYSTEM, ENGINE, POWER TRAIN
I have been to the dealership on three separate occasions due to the engine misfiring. Two ignition coils have been replaced so far and I recently returned to the dealership for the same issue. This time however, not only did the engine light come on but I went from a full tank to less than a quarter of a tank and the engine is making backfiring sounds. At that time the dealership said that they could not recreate the issue, I got my oil changed and went home. That was a week ago, I am back at the dealership today for the same thing; fuel dumping and backfiring sounds. While at the dealership today it turns out those backfiring noises were the fuel tank expanding so much so that it kept popping the seat up. They deemed the car unsafe to drive and it is currently at the dealership.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11600577July 9, 2024
ELECTRICAL SYSTEM
My battery has died twice, so dead that I can’t even unlock to car with the remote. The first time I had it jumped and took it to the dealership where they were unable to find anything wrong with it and they told me if it happened again to have it towed in so they could diagnose it while the battery was dead. So that happened again and I had it towed in to the dealership in early April. It’s now July and they still have my car and don’t have a diagnosis yet. They have had their field engineers out to run all sorts of tests, but nothing yet. Today they told me they have 3 Sonata hybrids there with the same issue as mine.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11597708June 29, 2024
ELECTRICAL SYSTEM
Randomly the car will get a message when driving starting “ Check Hybrid system. Turn engine Off” and the car isn’t able to accelerate when this happens. When you cut the engine off the car is unable to start again until it is jumped. I’ve confirmed the battery isn’t the issue however something with the vehicle is wrong. There are many accounts of people online dealing with the same issue.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11596837June 26, 2024
TIRES:MARKINGS, TIRES
215/55R17 94V BSW. . Contacted Michelin about two (2) of the four (4) tires DO Not have the date of manufacture on side wall. These tires are direction specific. They should known that. Maybe the date of manufacture is on the inside wall but they should known the the tire is DIRECTIONAL and be on Both sides. I am not going to jack up my vehicle and remove the tire to check the code (IF it is only on one sidewall). Will Return tires to Costco where purchased. Michelin has not responded to my emails...
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11595049June 18, 2024
ENGINE
Driving 70 mph, warning lights and alarms "Hybrid System Failure" "Vehicle shutting down" and then it does. No lights, no hazards, no power. Push button battery restart starts it again with no visible issues. Driving 30 mph, warning lights and alarms "Hybrid System Failure" "Vehicle shutting down" and then it does. No lights, no hazards, no power. Push button battery restart starts it again with no visible issues. Driving 58 mph warning lights and alarms "Hybrid System Failure" "Vehicle shutting down" and then it does. No lights, no hazards, no power. Push button battery restart starts it again with no visible issues. ^This is an ongoing issue. It's also been powerless several times while parked.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11593821June 12, 2024
ELECTRICAL SYSTEM
Driving on the freeway when we got a notice on the dash that we needed to pull over and the vehicle shut down due to a fuse,/battery issue.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11592346June 4, 2024
ELECTRICAL SYSTEM, ENGINE
My car will power off randomly, or will seem as though there is no power. I have to revert back to the manual key to enter the vehicle and hit the 12vlt reset to power it back on. This happened at least 3 times. Once while operating the vehicle, and twice while the vehicle was left parked. This is not a low battery issue as, the car will only do this occasionally, and not every time I enter and turn on the vehicle. There is no error code to follow this mishap as all power goes out and the dealer maintenance has nothing to work with.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11590388May 23, 2024
ENGINE AND ENGINE COOLING
The contact owns a 2021 Hyundai Sonata. The contact stated while driving 15 MPH, the contact noticed that the passenger’s side rear seat level had become elevated. The contact stated that his daughter who was seated in the child seat head had started touching the top of the sunroof. The contact became aware of a gasoline odor coming from the engine. The contact also became aware that the vehicle was consuming an abnormal amount of gasoline. There was no warning light illuminated. The vehicle was taken to the dealer however, the diagnostic test result was undisclosed. The dealer was unsure of how to service the vehicle. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 87,000. The VIN was not included.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11589918May 21, 2024
ELECTRICAL SYSTEM
Integrated 12v battery in hybrid system keep draining out. I have to manually open the car and reset it every time in order to be able to drive.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11588633May 14, 2024
ELECTRICAL SYSTEM, ELECTRICAL SYSTEM:12V/24V/48V BATTERY
The Battery dies randomly and requires the physical key to unlock the door. It is a hybrid, so it has a 12 volt battery button that jumpstarts the car. While driving the vehicle, the battery meter on the dashboard will show a near-full battery and then a near-empty battery within a few minutes. This vehicle was bought brand new from a Hyundai dealership and for the first 2 years, there wasn't an issue. The past few months, the battery issue started.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11585188April 25, 2024
POWER TRAIN, VEHICLE SPEED CONTROL
Vehicle began to lose power while on highway. The loss of power occurred for a few seconds, then came back. Shortly after, the RPM began changing uncontrollably. Tried shifting to manual control using paddle shifters and was able to maintain steady RPM until vehicle software switched back to automatic and RPM swung crazy again. Endangered other vehicles on road due to loss of power and fluctuations of transmission. Once parked, vehicle did not change to neutral, drive, reverse. Both manufacturer and insurance are/have reviewed vehicle and are working on a fix. No warning lights. Only indication was minor loss of power prior to incident. Loss of power was not considerable nor for a prolonged period of time.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11583054April 15, 2024
ELECTRICAL SYSTEM
Infotainment center won't switch to Radio. No signal for AM/FM or Satellite. Then HVAC system stopped blowing. No defrost, won't blow heat or AC. Blower motors been tested and works, blower motor resister replaced. Everyone I talk to is saying it's an electrical, connection issue.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11582461April 11, 2024
ELECTRICAL SYSTEM
the car keeps randomly dying (not during driving "yet") it happens at least once or twice a week of where i go to ride my car and it is completely dead, i have to unlock the door using the key fob manually and push the "Reset 12v battery button" inside the car. i have tried to have Hyundai service repair the issue or at least tell me what's wrong but no hope as they can never replicate the problem. I am seeing alot of users posting online on numerous web forms (reddit,facebook..etc) that they are having the same exact issue as me for the same exact model of my car, With also no help from the dealer on the matter. This must be a defect at some point and would greatly appreciate if NHTSA can help push this issue to the dealer
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11579000March 22, 2024
ENGINE
faulty engine thermostat
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11576439March 10, 2024
FUEL/PROPULSION SYSTEM, UNKNOWN OR OTHER
WAS PARKED IN BANK PARKING LOT. STARTED ENGINE, PLACED CAR IN REVERSE AND CAR ACCELERATED AT A VERY HIGH RATE OF SPEED. (LIKE I WAS IN A DRAG RACE!!) APPLIED BRAKES, WHICH DID NOT SLOW THE VEHICLE DOWN. DID NOT STOP UNTIL I RAN INTO A PARKED CAR. WHOLE INCIDENT TOOK JUST SECONDS. CAR HAD BEEN IN FOR REGULAR SERVICE AT THE DEALERS ON [XXX]. NOW HAS 16,597 MILES ON VEHICLE. CAR TO BE SERVICED AT RACHELS COLLISION, 720 S NOVA ROAD, DAYTONA BEACH, FL ON MONDAY [XXX]. IF I HAD NOT RAN INTO A PARKED CAR, I WOULD HAVE ENTERED [XXX] IN DAYTONA BEACH SHORES, FL WHICH WAS CROWDED WITH MOTORCYCLES.... FRIDAY NOON DURING BIKE WEEK. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Crash:
Yes
Fire:
No
Injuries:
0
Deaths:
0

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