Table 1 shows one common other fuel system related problems of the 2019 Hyundai Sonata.
| Problem Category | Number of Problems |
|---|---|
| Other Fuel System problems |
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.
Is anything being done about the known oil consumption issues with the 2019 Sonatas? my daughter bought the car used -- it currently has 70,000 -- but Hyundai won't do anything because she is the second owner and those cars don't get 100,000 protection, they only get 60,000. It just doesn't seem right.
Car has 39,495 miles. First owner of vehicle. Have advised dealership since 2024 that there was a oil issue as I have only went to them for oil changes. I advised that as they can see the car is barely driven and the oil is disappearing. They claimed nothing was wrong and made me pay for a oil change again. Come this year, I advise again there is a issue, they tried to have me pay for a oil change again and I advised something else needs done. They argued I was not the first owner and the car was not in warranty however I bought the car from their lot and I am the original owner. Then they stated I had to pay for another oil change for the oil consumption. Then they claimed they would just do the oil consumption and then to drive 1,000 miles and bring it back. After the oil consumption engine light is on. I drove 1,000 miles, brought it back and the engine failed the test. The dealership changed the engine. 5 days later engine light is on, car is stalling and brake locked up, then car would not start and was smoking under the hood. Car was then towed to the dealership. They claimed nothing is wrong and they reset the code for the engine light to go away. They stated evap code was on but was not persistent so it's fine. Few days later engine light comes on again and once the car has been running, you shut it off go to start it again it won't start unless you have it sit for a while. I take it back to the dealership they point next to the engine saying a purge valve, but the wants money for a diagnostic. They do the diagnostic and still provide maybes, as they claim the filler neck is rusted and corrosion. I take the car to another place who states the filler neck is fine.
Fuel pump went out.
What component or system failed or malfunctioned, and is it available for inspection upon request? since April 2025 I’ve been having low oil readings in my vehicle despite regular oil changes I took it into the dealer since my vehicle was still under warranty, which they stated only one part was under warranty. I had to pay $800 after this was replaced. I started having engine light come on. This engine light when I paid a diagnostic fee I learned that the cylinder three was misfiring. It was suggested that I have an oil change and get the oil level checked again within a week. This was done and it was determined that it was burning too much oil. I submitted this to the insurance and was told that this was not covered that there must be another reason why this was not working the way it should. 3 weeks ago then I was asked to replace the spark plugs and coils. These were replaced for an additional cost of approximately $300. After replacing this, the check engine light gave the same condition of third cylinder damage. . And the oil level continue to decrease the vehicle was left with the dealer for approximately 10 days. They stated that the engine needed to be cleaned due to possible carbon buildup for about $800 then they stated that the spark plugs and coils needed to be replaced with a specific brand and not the type that was previously used. Then my vehicle was returned to me, performing sluggishly with the check engine light returning with the same condition of third cylinder misfire. An inspection is available. How was your safety put at risk? the possibility engine failure away from hom has the problem been reproduced or confirmed by a dealer or independent service center? yes twice has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? no were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? yes frequently over the last 2 months.
While driving the car it suddenly decelerated and multiple warning errors on electronics, driver assist, braking started going off then the error message of check hybrid turn engine off came on. I was able to coast into a parking lot as the car could only go around 5 miles an hour. I turned the care off and on and the check hybrid turn engine off remained for the 2 hours it took to have a tow truck come to take the car to a dealer. The car has 16,383 miles and prior to this there was no warning or error messages. The dealer hasn't reviewed the car yet, but the fact that it immediately, with no warning, decelerated and would go only 5 miles an hour is very risky and unsafe.
Car has issues with fuel pump with only 64k miles. I was told by Hyundai that I need a new fuel pump. With such low mileage this appears most likely to be a manufacturing defect. Hyundai Sonata has had recall issues regarding this part in the past.
I have had issues with oil consumption in this vehicle for about 4 years. I started getting a "knock sensor" code. I replaced the knock sensor and still had problems. Hyundai had a recall and they reprogrammed my computer board. A year later I was having the same issues. My car started stalling out. Took back to the dealership they said my engine had sludge and now they're saying that there is a hole in my engine. Hyundai is saying that I don't qualify for assistance.
The message "hybrid system failure" suddenly displayed and the vehicle lost power and stalled. This occured on hyw (65mph) and nearly caused wreck from behind.
2019 Sonata 2. 0t with just over 11k miles on it began to suddenly studder and want to stall at low rpm or at the stop. Obdii error code p0302. Dealership said cylinder 2 had little to no compression and needed repair. Could barely limp vehicle to dealership and smell the unburned fuel being ported out of the exhaust.