2019 Hyundai Tucson: misfire or rough idle

Filed Sep 10, 2026 · Engine, Transmission · TN

I had bought my car in May of 2025 and within 12 hours of owning it. The check engine light came on. They replaced the sensor well. A couple days later, the check engine light came on again, and they had to rebuild my whole engine had the car for a month at this time. When they rebuilt the engine, they had the car for over a month. And ever since I got it back, it's always something the same thing has to get repaired. Well, I took it to the shop. Yesterday because it was misfiring, and I needed to have some spark plugs replaced, and they said that the Ignition coil needed to be replaced, but there was a recall on that not too long ago. And they fixed that on the recall. There's no reason that should have already went a few months later. Well, the problem is when I bought my car, I bought it from tar. Hyundai, it's now rusty, while it's Hyundai. They charged me $200 just to get my car out of their lot. Because I refused service because they were trying to charge me. $2500 to fix my car. Now mind you, I've already put over $4000 extra into this car. After purchasing it for over 21000 now they're not wanting to honor any work that Tara. Hyundai done because they don't be responsible. They don't want to honor the tar. Hyundai warranty or anything I've had it with this Hyundai company. I've been driving this lemon. It is yet again in the shop. Being fixed, although the engine was rebuilt a year ago, there is no reason. This car should keep having engine failure. They don't want to honor it. They don't want to give me a new car, they don't want to, they're acting like they don't care like, 00 well, it's your fault, but I did not buy the car, as is it came with a warranty. When they reserved my engine and had to rebuild it. They extended my warranty 2 hundred and fifty thousand miles

Filed May 29, 2026 · Engine, Transmission · IA

While driving, the check engine light began flashing and the vehicle shook severely due to engine misfiring. The vehicle has had a recurring cylinder 3 misfire throughout ownership. Spark plugs and ignition coils were first replaced around 40,000 miles and replaced again in December 2025 for the same recurring issue. A Hyundai dealership inspected the vehicle and found codes P0300 random misfire and P0303 cylinder 3 misfire. The dealership technician documented that the piston rings did not look good and confirmed the catalytic converter was damaged as a result of the misfires. The vehicle has had an engine rattle at idle, oil consumption, and blow-by since early in ownership. The engine defect is progressive and predates the current mileage. The flashing check engine light and severe shaking while driving at highway speeds created an unsafe condition with other vehicles on the road. The problem has been confirmed by a Hyundai dealership. Hyundai Motor America was contacted and denied goodwill warranty assistance. The vehicle is available for inspection upon request.

Filed Oct 10, 2024 · Engine · IN

My car lost power and was shaking while driving, the dealership service department told me that that my car was producing a code for a misfire in my exhaust valve chamber #3 and I could replace this for $4400 but in a few months I would need a new engine so they recommended I replace the engine for $8000. I am 1000 miles over my warranty so Hyundai is refusing to pay for this. I currently finance my car and owe $22000 on it still and can not afford to fix my car out of pocket. My car has been at the service department since 9/6/2024, I’ve researched this problem with this make and model and thousands of Hyundai owners are being denied for new engines because the engine failure was not caused by the rod bearings, ultimately both of these concerns and problems are cause from oil consumption and these vehicles burning oil. After multiple exhausting attempts to clear this up with Hyundai USA corporate and my local dealership. I’m am now working on other options. Driving down a 70mph highway losing acceleration is dangerously unacceptable

Filed Sep 4, 2024 · Engine, Fuel system · AL

formance exhaust. I bought catalytic conVerter that they told me to buy for 600+ dollars and took it to child's shop they told me that the catalytic converter isnt clogged nor is it affecting my car and provided me with these codes about the camshaft and crankshaft (P0017,P000B, P000A) which they stated hyundai should have fixed under the engine warranty because it was a recall on these engines on this year car. They stated that even if fixed the converter my car would still perform the same and 3 other mechanics have said the same and stated hyundai would have to fix it. After oil changes the oil consumption in my car is constantly getting oil before its even due for another oil change. I have already paid so much just by having people look at it, buying oil, parts, and etc. i am furious to know that i was sold a car that was recalled with engine problems and been having problems since i got it. I have 2 kids i have to get to and from school and this my only transportation. My car has been misfiring and not going over 40 miles. This is my only vehicle and hyundai has put me in a messed up situation. The recalled was may 2022 and hyundai sold me this car june 9 2022. I contacted the june 15, 2022 about the engine light they kept turning off. Car is stalling, making noise, not holding oil. Have to top oil weeks after getting oil changed

Filed Jun 27, 2024 · Engine · 100,000 miles · NH

The contact owns a 2019 Hyundai Tucson. The contact stated that upon starting the vehicle, he observed unusual RPM fluctuations and vibrations during idle, after which the check engine warning light illuminated. The vehicle was taken to the dealer, who diagnosed a failure with the catalytic converter. The vehicle was not repaired, and the contact continued to drive the vehicle. The vehicle was later taken to an independent mechanic, who determined that there was a misfire in cylinder #4. The independent mechanic informed the contact that the failure was previously misdiagnosed, resulting in damages to the engine and that the engine needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure but provided no assistance. The failure mileage was 100,000.

Filed May 18, 2023 · Engine, Fuel system · FL

Replaced catalytic converter been to the shop twice. It keeps having reoccurring issue of not wanting to accelerate, won’t go over 54, wont go over 2000 rpm, stalls and misfires. My neighbor has same model and year and just had to replace catalytic converter as well.