2010 Hyundai Sonata: check engine light

Filed Sep 11, 2025 · Engine, Steering · CO

Car has had check engine light on for 3 + years. Have taken it to several mechanics including a Hyundai dealership and none of them can figure out what is wrong. Have replaced water pump, belts x2 in a year (same belt) and thermostat x 3 again (all within 2 years). Dash fuel gage and Dash heating/cooling gage are completely erratic. Cruise control does not work. Due to chronic check engine light and mechanics unable to pin point the problem, car has become hazardous to drive. With that in mind, today (9/10/2025) while exiting the high way, car stalled and behaved like it was in neutral. Steering wheel also locked up at this time. Luckily was able to stop. Had to restart car and then it occurred again while driving on a side street at 35mph. The codes that are still popping up are ones that I have spent thousands trying to fix and find the root cause of the problem. What could the issue be if no mechanic can seem to diagnose and fix the issue?

Filed Nov 30, 2023 · Electrical, Lights · TX

The plastic housing of the brake lights have turned black. I'm on my second set that I got at wrecking yard. The plastic doesn't hold up to the heat of the tail/brake light. I saw other cars like mine with same problem at the wrecking yard. And my ground wire to my radiator fan burned out as well during COVID. I think Hyundai used cheap plastic that can't hold up to the heat. My dash cracked really bad as well. All over. I saw the same cracked dashes of other car in wrecking yards. They know they had a plastic defect and they changed body styles the next year. My door handles brake off in my hands and the a/c vent broke twice. They have hazzard car because all of this happened early when I purchased the car. And my car has Hyundai and Kia parts old body style 2010 bought end of 2009. Theta 2 engine. All of the recalls but they leave my car out. And that stop brake switch light has broken so many times. Replaced free only 1 time by dealership. Other times I had to pay for. Cheap plastic. If I need repair by dealership , I have to leave car on their lot for 6weeks for them to look at. Not appointment. Leave my car on lot until it's my cars turn. And my car just quit running once while driving in my apartment complex. It also quit running driving down the highway.. everything shutting off and lights turned on dash. The battery light was on first, then the check engine , abs, and all lights coming on. I tried to turn on my hazards but everything was failing. I was lucky I wasn't hit by other highway traffic. My headlights went off or really dim. I was allowed to drive really slow to a roach hotel just there on interstate. I was told it was my alternator. But I think it was something else that caused failure. I did have my car professionally washed, that day. (Hardly do that). And the week before it was at Hyundai shop for retinting of windows which my battery was dead in their dusty lot when pickup. That brake light switch lamp stopper was broken and laying in floor l

Filed Aug 24, 2023 · Engine · NY

I purchased a 2010 Hyundai Sonata in February 2022 from the original owner. In July of this year, my engine failed due to the oil consumption defect found in many of Hyundai's engines produced at the Alabama factory. My oil and check engine light came on before it was time for my following oil change, despite making on-time synthetic oil changes during ownership. The vehicle hesitated and jerked on my commute to work, potentially causing harm to myself and other motorists. I went to take my vehicle to the mechanic on my lunch break. The car failed to turn over and has been inoperable ever since. I need my engine replaced at no charge. It's unconscionable that corporate would turn me away because the engine has 146k miles, which is nowhere near the industry standard 200k. Hyundai has inspected the vehicle and confirmed that an engine replacement is needed.

Filed Oct 16, 2021 · OH

My car check engine light is on for a while.it’s yellow solid light seen on my car dashboard.I went repair center and he advice and changed my car vent valve and light goes out for some days and again appear. I change my car gas cap too but it didn’t work. I spent a lot of money to fix that.

Filed Jul 25, 2020 · Engine · 126,454 miles · WA

As I was driving on the freeway my car which was on cruise control. The car went from 60-50-40-30 within 30 seconds while it still said cruise control was on and the gas and brakes didnt work. I had to pull over to the side of the road. The electronics still work but the car no longer work and did not turn on. It seized while I was driving. No warning lights, no check engine light, no gas light, absolutely no warning before the car seized.

Filed Apr 9, 2020 · Driver assistance, Transmission · 120,000 miles · TX

Esc off light comes on, and check engine light comes on sometimes when driving. Sometimes, the car loses its power when that happens in the middle of driving. Acting as if the car was turned off. It has happened multiple times.

Filed Aug 1, 2019 · Engine · 163,500 miles · MD

I have been having a problem with the engine light coming on for a while now and I have taken it to have it checked out, it has been put on the diagnostic machine to see what came up on the report. This has been done a number of times and whatever report shows up I have had it fixed but the engine light still would come on and it was suppose to be fixed, I would like some help in finding out why this problem continues this becoming costly and still not fixed could I please get some help with this. Would appreciate a response. Thanking you in advance [xxx] 2010 hyundai sonata. This problem has been going on for 1 year and 3 months without any kind of solution to the problem. Information redacted pursuant to the freedom of information act (foia), 5 u.s.c. 552(b)(6).

Filed Jun 1, 2019 · Engine · MD

Engine light was coming on took car to shop the engine light was on code po449 evap system fault failure in vapor canister housing performed diagnostic and pinpoint testing found said it needed canister close valve and canister easy the work was done but the engine light still comes on.

Filed Apr 25, 2019 · Steering · 65,000 miles · TX

Tl* the contact owns a 2010 hyundai sonata. While driving various speeds, the steering wheel seized and the check engine warning indicator illuminated. The contact stated that the steering wheel was difficult to turn and made a squeaking noise. The failure recurred numerous times. The contact called sterling mccall hyundai (located at 10505 southwest fwy, houston, tx 77074, (713) 981-4400) and was informed that the VIN was not included in a recall. The vehicle was not taken to a dealer or an independent mechanic for diagnostic testing or repairs. The manufacturer was not notified of the failure. The approximate failure mileage was 65,000.

Filed Dec 9, 2017 · 40,000 miles · OR

While driving the car died. I restarted and the check engine light and ESC light came on. The car jerked a bit and the check engine light went off but the ESC light off stayed on. After shutting off I started it the next day and the lights were off then after a while came back on. It is expensive to take to dealer to try something to see if it will fix the problem. Brakes jerky when applied.

Filed May 20, 2017 · Fuel system · 50,000 miles · LA

The gas pump nozzle always switches off when I try to get gasoline, making it impossible sometimes to get the number of gallons I need, requiring a guess when the tank will be full because the trigger won't stay in place. Our 2010 hyundai sonata was purchased in 2012 and has had this problem since day one, and I see it is a common complaint on the internet among sonata owners. We brought it into the hyundai dealership in two different states: neither was able to locate the problem! This is unacceptable. At one point, we could not put any gas in and had to drive it immediately to the dealership. They replaced a carbine cylinder in the gas tank that cost $700. Just so we can put gas in the car, an requirement of its function. There was one pump at a gas station halfway across town that I found to work flawlessly. So I would drive there weekly on the outskirts of town. Twice, I was approached by strange men looking for money or a ride to the casino. Then on this last time it took 15 or so small pumps to raise the needle just a third of a tank. It is a safety issue as an overfull tank could spill toxic petrol on us while we are pumping gas, or leave us with too little gas and no way for the pump to work, and get stranded in a bad part of town or a highways. The check engine light has been going on and off for months, sometimes seeming to be related to the gas cap. Yet the dealerships can't help us and there is nowhere to buy gas that isn't a frustrating ordeal. Unacceptable. What are you going to do about this? Https://www.hyundaiforum.com/forum/hyundai-elantra-17/problem-filling-gas-tank-3298/ "if the federal safety agency receives similar complaints, it may open an investigation, and if it finds that a safety defect exisst in a group of vehicles, it may order a recall and remedy campaign." -- 2010 sonata owners manual, ch. 8, p. 16

Filed Jun 13, 2016 · Engine · 98,000 miles · FL

Tl* the contact owns a 2010 hyundai sonata. While driving at various speeds, the check engine warning indicator illuminated and the vehicle lost power. The vehicle was towed to the dealer where it was diagnosed that the motor seized due to lack of oil. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 98,000.