2011 Hyundai Sonata: check engine light

Filed Aug 29, 2026 · Electrical, Engine · IL

I had taken my Sonata to Mike Miller Hyndia in Peoria,I'll and they agreed to do the recall although they had my vehicle for two weeks. They did not service it and when I picked it up they said I had to drive it till the service engine light come on. I was driving it five days later and heard a loud noise and car started malfunctioning I was stuck in a middle of a intersection and I had to push vehicle off road. I broke my right hand in this process and I have also lost my job I am very concerned why they did not service it after they agreed too and sent me off in it in that condition ..The car is currently parked and unsure what to do with it ..

Filed Jul 22, 2026 · Acceleration, Engine · OK

I test drove the vehicle at an auction, watched several other people test drive the vehicle. Before the auction I test drove it one more time and put my obd scan tool on it to make sure there were no hidden codes or problems. I won the bid,and picked up the vehicle. I drove it approximately 6 miles from the auction and the falshing engine light popped on. I immediately pulled over in heavy freeway traffic. Put my scan tool on it and found out the knock sensor had triggered. The vehicle was shaking and making a terrible racket. It was inoperable in the worst possible spot on Highway 51 during rush hour traffic. I managed to slowing coast down the offramp and roll into a parking lot. I then called Purdy Hyundai and spoke with a service advisor and provided the VIN#. He (Vue Kue) informed me that the vehicle qualified for the recall and warranty work based on exactly that issue. I had the vehicle towed to the Purdy dealership on July 8th 2026. I was told today that it was unlikely that Hyundai would honor the recall because I did not have service records of a vehicle I had owned for 6 miles of driving. I filed a complaint with Hyundai corporate. Claim#43010067 and awaiting the reconciliation of this situation. Of which they appear to to be avoiding.

Filed Mar 31, 2026 · Engine · GA

On March 18, 2026 I brought my vehicle to AutoNation Hyundai for an oil change and full diagnostic. Your dealership’s own diagnostic report showed no knock sensor code, no engine issues, and no active warning lights. My car was fully drivable when I dropped it off. Within 30 minutes of picking my vehicle up, the check engine light began blinking and the car became completely undrivable. It has not moved since March 20, 2026 at the dealership. The dealership did an additional diagnostic and found a knock sensor that was not there during the first diagnostics and have stated that my engine has too many miles to be covered uder warranty.

Filed Oct 28, 2025 · Engine · 184,000 miles · TN

The contact owns a 2011 Hyundai Sonata. The contact stated that while driving at an undisclosed speed, the engine started to overheat, with the check engine and temperature warning lights illuminated. The dealer was contacted. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 184,000.

Filed Oct 13, 2025 · Engine · OR

My daughter was driving her 2011 Hyundai Sonata on the freeway at 65mph when the engine light came on and car simultaneously slowed to a stop on 8/21/25 creating significant danger to my daughter and other drivers on the road. There were no prior warnings or indications, and car just had an engine check performed in June 2025. Had it towed to Hyundai on 8/22/25 and Hyundai completed an engine check and it failed. Hyundai told us they'd cover it under the extended warranty if only we could provide complete maintenance records. We were unable to satisfy their record request threshold, as we are not the only owners of this 14-year-old vehicle, so they've requested $10,000 to replace the engine instead. The 2011 Hyundai Sonata is part of the Theta II engine family that has been subject to multiple recalls, class-action lawsuits, and federal investigations due to catastrophic engine failures.

Filed Aug 28, 2025 · Electrical, Engine · IL

2011 Hyundai Sonata had a Theta ii engine replaced in September 2024 after engine failure. Hyundai paid for the engine through the extended warranty on the theta engines. Check engine light is still illuminated after new engine and after multiple visits to the dealership, they say the wiring harness is bad. Contacted Hyundai Corporate who said they will not pay for anymore warranty repairs, even though the wiring harness was damaged from the bad engine or during the replacement. From my understanding, it is dangerous to drive a car with a bad wiring harness due to fire risk, loss of power, or loss of safety components.

Filed Aug 14, 2025 · Engine · TN

The contact owns a 2011 Hyundai Sonata. The contact stated that while driving at an undisclosed speed, the vehicle jerked, and the vehicle failed to accelerate as intended while depressing the accelerator pedal. The check engine warning light was illuminated. The contact stated that on a separate occasion, while driving 35 MPH, there was smoke coming from underneath the hood. The contact pulled over to the side of the road and turned off the vehicle. The contact opened the hood, and there was smoke coming from the valve cover and coolant reservoir. The contact waited for the engine to cool down and the vehicle was able to restart. The contact stated that on a separate occasion, after turning off the vehicle after arriving at work, there was an abnormal bubbling sound coming from underneath the hood. The contact opened the hood and there were bubbles coming from the radiator. Prior to the failure, the contact had replaced the radiator, due to the engine overheating. Two weeks later the radiator hose detached. The contact stated that the fluid leaking from the radiator was dark brown and seemed to be mixed with slush. The vehicle was taken to an independent mechanic who determined that there was foreign parts inside the radiator. The contact was informed that the radiator needed to be replaced. The vehicle was not repaired. A mobile mechanic arrived at the residence and confirmed that the radiator needed to be replaced and an unknown valve on top of the engine needed to be replaced. The vehicle was not repaired. The failure became progressively worse, and the vehicle was no longer driven. The manufacturer was not notified of the failure. The failure mileage was unknown.

Filed Apr 18, 2025 · Engine, Fuel system · MN

I had bought this car off Facebook marketplace after confirming with my dad that it was a good car, when I had finally saved enough. After I took it home the check engine light had come on not too long after, the engine stalls when turning the key, pressing on the brake helps start the engine. Turns out the car was a salvage title and my dad didn’t know that and I didn’t know what that was.

Filed Jan 12, 2025 · MA

While Driving sometimes car comes to a slow paste like it wants to stall I have to take my foot off gas paddle and put my foot back on again for car to accelerate and speed up again I am also noticing this when I turn my headlights on while car is driving. Recently had car engine light come on and car had to be towed to a mechanic. Car was fix where light was gone but I am still having the problem with the car wanting to stall while driving.Took it to dealer who said they saw nothing wrong because no check light was on but the problem for me still is there as of this morning 1/12/2024

Filed Dec 7, 2024 · Fuel system · WA

I tried pumping gas and the car would not let me pump the gas into the car. I had to hold the the gas pump hose and pull the trigger myself to pump the gas, which would still make the clicking stop noise that stops the pumping of the gas. Then when I started driving, the check engine light came on. Went O'Reilly to test the check engine light code and it popped up with a P0449 code for the evaporative emissions (EVAP) vent control valve.

Filed Dec 7, 2024 · Acceleration, Engine · WA

When my car is turned on there is a very noticeable shake coming from the engine area. It's not that bad once the car is driving. However, I was driving 40 miles an hour when my check engine light came on, then I was unable to accelerate and my car stalled (it's an automatic car).Once my car started up again, the check engine light was flashing, and I could only drive at like 15-20 miles per hour for my speed. Made it to O'Reilly and had them run the check engine light codes for me and it popped up with the P1326 code regarding the knock signal range/performance. I recently got a check engine light code for a p0449 EVAP vent control valve (it wouldnt allow me to pump gas into the car). I'm unsure if the issues are related but wanted to provide all the details.

Filed Oct 30, 2024 · Engine · 280,000 miles · MS

The contact owns a 2011 Hyundai Sonata. The contact stated while driving at an undisclosed speed, there was a loud knocking sound coming from the engine with the check engine warning light illuminated. The contact stated that the vehicle lost motive power. The vehicle was restarted; however, the failure recurred. The vehicle was towed to the dealer but was not diagnosed or repaired. The manufacturer was made aware of the failure and confirmed that the VIN was not included in the federal safety agency Campaign Number: 15V568000 (ENGINE) because the maintenance records were not provided and the dealer deemed that the vehicle was poorly maintained. The approximate failure mileage was 280,000.