Which parts fail
Components named in complaints (battery, alternator, wiring, ignition, instrument cluster, infotainment).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2007 Hyundai Sonata owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2007 Hyundai Sonata. The contact stated that while driving at various speeds the vehicle drove sluggish and unresponsive and would not properly accelerate. Upon inspection it was discovered that engine oil from the valve cover gasket had leaked onto the alternator. The vehicle was taken to the local mechanic who diagnosed that the alternator was damaged due to the presence of oil inside and needed to be replaced. The vehicle was not yet repaired. The contact indicated that the vehicle was previously serviced by the manufacturer to prevent the failure from occurring but the failure had occurred on two separate occasions. No further information was available. The manufacturer and local dealer were not notified of the failure. The failure mileage was 151,000.
I have been encountering issues with my 2007 Hyundai Sonata SE in the following manners: 1- At times the brake lights will be on and the car will have anyone inside. 2- My ESC OFF light comes on will not go off. 3- When using my headlights the cruise control will not work. (Specifically when the automatic lights would come on the cruise goes off) 4-At random times the key will not turn. All the above mentioned issues concern the electrical system!, Speed Control!, and lighting systems. All are available for inspection upon request. My safety and the safety of others has been put at risk because of system failures causing the car to operate improperly and dangerously. I have not had the extra money to take it to the dealership. No other reports have been made. The only warning light is the ESC OFF light comes on occasionally. This light began coming on 6 months ago.
I have a 2007 Hyundai Sonata SE v6 3.3L and on January 9th, 2026 I had an incident where on the road my charging system light on signifying alternator failure. I made it home, but the battery was dead which was recently purchased. After recharging the battery I conducted tests with a multimeter and have determined the alternator has failed. The alternator has accrued a coating of oil overtime that was unknown until my research into the matter of root cause. Hyundai manufactures a V6 engine family called Lamba in which a version called Lambda MPi G6DB was introduced in 2007-2009 Hyundai Santa Fe (CM) and 2005-2009 Hyundai Sonata (NF) models. In 2023 Hyundai issued a recall for the 2007-2009 Santa Fe for a Cylinder Head Cover Oil Leak Repair where oil drips from the valve cover directly onto the alternator causing it to fail. …
I have a 2007 Hyundai Sonata 3.3 I have had issues with the cars lights shutting off for years. I have mentioned it when I brought the car in for other recalls and issues under warranty and it was ignored. After much reading I have found that many of these cars are having issues that people have posted about. This doesnt include the many like myself that have not gone to the internet and asked or complained. I can not get my lights in my car to shut off on auto or manually. It is in the electrical fuse system. I have to lay down on my floor of drivers side and reach up and pull out the electrial plug that goes into the box to get the lights off...this is unacceptable and Hyundai turns their cheek to this issue. I think it is a fire and electrical hazard. The part costs over 500.00 and then to get someone to put it in. …
Vehicle was taken to Hyundai because the airbag light was illuminated, and the passenger seat belt reminder light would blink when no one was in the seat. After a diagnostic test, the dealership advised this was due to a faulty airbag sensor in the passenger seat, that was part of the actual seat. The replacement seat cushion was going to cost upwards of $1200, with the installed price of over $1500! After looking at the NHTSA complaints, I saw I am not the only one who has had this problem. A quick google search also showed a plethora of other complaints in regards to this issue. There is obviously a major issue with the sensors/airbag/seat belt system in these vehicles, and I am hoping a recall will be issued. Hyundai could not tell me if this issue would affect my airbag system or not. Thank you.
The car was making a noise when I started it. The noises got worse as I drove to work. Then the car died twice while in route on the interstate. The oil light came on. The heat gauge was normal. I notices smoke in the rear view mirror. I turned on the hazard flashers and began to get to the shoulder of the road. When I stopped the smoke got worse. I called work. The dotd roadside assistance showed up. I got out of the car and walked back toward him. He asked where my purse was. I turned back to the car and noticed flames coming from under the hood. He got my valuables out of the car, called the fire department and police. The flames were several feet high by the time they got the fire out. I called a tow truck. A fellow worker came and took me to work.
When I exit my car and my headlight are turned to off position and close door, my running lights stay on. Which I have jad to chargr my battery due yo this. So er thought it was the headlamp switch. Still having the same problem. So looked up the problem and found a couple different forums stating that this is a relay problem. The biggest problem is that this relay is integrated into the fuse box. So in order fpr this problem to be fixed I am told I have to replace a fuse box. I am not the only one with thos issue. This happenes every time I exit my vechicle after driving it. This needs to be recalled. 2. My drivers side and passenger visors do not stay up. I have gotten hit in the head. This should also be on recall.
I first noticed the valve cover gasket leaking onto the alternator at about 121,000 miles and at 140.000 miles I had the valve cover gasket replaced, thermostat, intake plennom gasket also. And had the alternator replaced after it failed because of the oil leaking onto it at 156,092. Luckily I just drove by my mechanics garage at about 50 MPH and about a mile passed his garage the car started to buck and stall and all the dash board lights were flashing along with the cd turning on and off along with the seat belt light which was flashing on and off when it was buckled for about 1 month prior to this failure. I actually made it to his garage before it shut down in his parking lot.
My brake lights no longer function. My "ESC off" light and check engine light appeared. I had a mechanic scan my car regarding the aforementioned issues and the code that displayed was "p0504". After researching this code I have discovered: the engine control module (ECM) has detected a fault in correlation between the two brake switch circuits. This very problem has resulted a massive recall for Hyundai & Kia vehicles. Unfortunately, my vehicle is not eligible for the recall according to the VIN look up for this recall campaign (110). I should not have to pay out of pocket for this manufacturer defect!!!
Tl* the contact owns a 2007 Hyundai Sonata. The contact stated that while driving at various speeds, the occupant classification system became disabled when an adult was seated on the front passenger side seat. The front passenger air bag light illuminated. The contact mentioned that the air bag light illuminated, shutting off all air bags within the vehicle. The vehicle was service under NHTSA campaign number: 08V161000 (air bags). However, the remedy failed to repair the vehicle. The manufacturer was notified of the failure. The failure mileage was 72,000.
Electrical complaints in other Sonata years
Frequently asked questions
How common are electrical problems on the 2007 Hyundai Sonata?
NHTSA has 51 complaints about the electrical system of the 2007 Hyundai Sonata, 7% of the model year's 696 complaints. The component named most often is wiring (2 mentions).
Is there a recall for 2007 Hyundai Sonata electrical problems?
No. NHTSA lists no electrical system recall for the 2007 Hyundai Sonata, though it has 5 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2007 Hyundai Sonata electrical problems start?
Half of the complaints with a recorded mileage happened before about 98,000 miles, and 8% before 25,000 miles.
Is it dangerous?
Owners linked 1 crash, 1 fire and 1 injury to electrical system problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.