2010 Hyundai Sonata

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?

While driving 60–70 mph on [XXX] just north of Sylmar, I suddenly heard a loud, deep “pop” from the lower part of the car. Within seconds, the engine began steaming heavily and leaking oil everywhere. I immediately turned on my hazard lights and began maneuvering toward the right shoulder, crossing multiple lanes with semis and fast-moving traffic approaching behind me. I felt unsafe and feared the car could catch fire or explode, especially with smoke and oil present. After safely exiting the vehicle, a mechanic later told me the rod bearing blew and punched a hole through the bottom of the engine block, calling it a total engine failure. He said it would require a full replacement and matched known issues with this model. There was no warning before the failure. I’m having it inspected at Hyundai of Downtown Los Angeles on July 28. I believe this event posed a serious safety hazard to me and others on the road. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The contact owns a 2010 Hyundai Sonata. The contact stated that upon attempting to turn the ignition key in the ignition switch to start the vehicle, the ignition switch failed to turn, and the steering wheel locked. The vehicle was towed to an independent mechanic, where the ignition switch was replaced; however, the vehicle failed to start. The mechanic determined that an unknown part needed to be replaced. The mechanic contacted the manufacturer for parts and was informed that the unknown part had been discontinued. The vehicle was not repaired. The failure mileage was unknown.

Fuel pump failure, causing car to stop immediately on highway.

The contact owns a 2010 Hyundai Sonata. The contact stated while driving at various speeds, the steering wheel was constantly pulling to the right. The contact had to steer to the left to keep the vehicle centered. The failure persisted even after wheel adjustments had been made. The vehicle was taken to an independent mechanic where it was diagnosed and determined that an alignment was needed. The wheels were aligned. The manufacturer had been made aware of the failure. The failure mileage was 70,000.

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

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.

the alternator failed and after being tested, had to be replaced.

I have several recalls on my vehicle and the dealership only scrub and they did not replace the crossmember and other parts. I need help to see if this is OK

I am contacting the NHTSA regarding a manufacturer's failure to comply with a NHTSA recall campaign. The campaign in question is #13V113000 for a 2010 Hyundai Sonata. The certified Hyundai service center claimed, verbally and on the customer invoice, to have replaced the stop lamp switch with a new OEM part, number 93810-4DR0A-QQH, per the recall's order. After supposedly replacing the defective part, the vehicle is still able to be shifted out of Park without first depressing the brake pedal. This happens with the key in the 'ON' position, 'Accessory' position, and even without the key in the ignition at all. No depression of the brake pedal is currently required to shift the vehicle, in any form, violating the recall's correction order. After contacting Hyundai Motor Company, they informed me via phone and email that because the car is "so old" and "out of warranty", I would remain financially liable for diagnosing and repair of any problems related to NHTSA Campaign #13V113000. Based on the fact my vehicle's current and ongoing issue is EXPLICITLY clarified in the details of Campaign #13V113000, I believe it remains Hyundai's responsibility to ensure the vehicle is safe to operate. Furthermore, Hyundai has seemingly, knowingly and willfully threatened my safety, safety of passengers, and that of the general public by refusing to thoroughly comply with a NHTSA Campaign. This subsequently places the person(s) listed above at risk of injury or even death due to Hyundai Motor Company's negligence. I hope that by reaching out to the NHTSA about this ongoing issue, the problem can be resolved respectfully, as the next course of action and final recourse, with regards to Hyundai Motor Company, may result in legal escalation. Thank you.

Recently at the Hyundai Dealership in Plantation,Florida I had them repair 2 RECALLS which were the LAMPLIGHT SWITCH & CROSSMEMBER. These RECALLS were not done correctly and caused my ESC Light to come on and my car shakes while driving. I never had these items before until they worked on my RECALLS. Now the Hyundai Dealer service is refusing to fix the damage they caused. I need help right away. The RECALL repair appointment was on June 12, 2022 and had them check the RECALLS again on August 29, 2022. My car is still at the Hyundai Service in Plantation, Florida.

Junction box failure. No functioning marker lights.