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 2009 Hyundai Sonata owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2009 Hyundai Sonata. The contact stated that while her daughter was driving 60 MPH, the vehicle lost motive power. The contact was able to pull to the shoulder of the roadway, where the vehicle failed to restart. After calling AAA, the technician determined the vehicle had run out of gasoline however, the instrument panel was reading a half tank. No warning lights were illuminated. The vehicle was towed to the dealer, who diagnosed a failure with the instrument panel. The vehicle was not repaired. The manufacturer was notified of the failure but offered no assistance. The failure mileage was 184,500.
I see that the manufacturer has an "Open Service Campaign" on their Sonata's shark fins. I've taken mine to the local dealership and they want a min. $700 to replace the shark fin. It just came off somewhere (a couple of years ago) and, now, my car has to be jumped off if I let it sit more than two days. I have had it inspected by the dealer and an individual garage. No one would tell me what was draining my battery. I am a senior citizen and fear I will get stranded on the road somewhere. The missing fin lets water into my car, soaking the carpets, etc. Finally, it was suggested that the car cover I keep on it touches the exposed fin components and that's what was draining my battery. It seems that the manufacturer was aware enough of this faulty part to want to prevent complaints by voluntarily replacing problematic parts (thus the service campaign). …
Brakes seize up while driving and then cannot move the vehicle. This causes a dangerous situation while driving and then breaks lock up and cannot move car even though vehicle is on and then stopped for a stop light. Car must then be turned off and sit for about 30 minutes so it can unseize and when that happens, you can then resume driving and then check engine light comes on. Brake lights were staying on even when vehicle is shut completely off. ABS and ESC lights stay on consistently and never turn off. Vehicle brake switch was replaced at Carolina Hyundai of high point, NC. So break lights have been repaired. They had to order the stop switch lamp replacement for recall as it was never done and will be fixed in next week. 3 door handles fell off and cannot open the rear driver side door at all. …
We purchased this vehicle used 9/2022. A week later it began to jump upon accelerating and slowing down. We took it in and they said it was the power train control module and our warranty would not cover it. So it would cost us around $1600. We can't afford that. We have only driven it a few times since. We were parked in front of a curb and the car accelerated us into a curb. Now, the ESC OFF, ABS, and engine light are illuminated. This is not a. It also wear and tear issues, as I've seen many others posting similar experiences. Our car is an '09 with almost 90,000 miles on it.
All car systems flashed and car went completely dead. Nothing worked. First time it happened mechanic said alternator and battery had to be changed. A year and a half later exact same thing happened and again new mechanic says the alternator needs to be changed. BIG SAFETY ISUUE AS CAR DIED IN THE MIDDLE OF HIGHWAY WITH CARS GOING ALL AROUND ME TRYING TO AVOID ME. This is Second time the alternator has to be replaced with only 2000 miles on the car after the alternator was replaced the first time.
Oil Leak on Alternator Engine leaking oil from the front cylinder bank's valve cover or from the valve cover's gasket onto the alternator. An unknown amount of oil damaged the alternator resulting in illumination of the charging system warning lamp and disablement of the charging system. If the vehicle is continually driven with a disabled charging system, the engine can shut off, increasing the risk of a crash.
Engine leaking oil from the front cylinder bank's valve cover or leaking from the valve cover's gasket onto the alternator. A sufficient amount of oil could damage the alternator resulting in illumination of the charging system warning lamp and disablement of the charging system. If the vehicle is continually driven with a disabled charging system, the engine can shut off, increasing the risk of a crash.
Valve cover gasket leaks and oil leaks on to the alternator which can cause the alternator to fail and the battery to not maintain a charge and the car can stall and then not start. This is the same exact problem problem that is in your recall on 2007-2012 Veracruz Recall number 20V705000 & 14V415000 And 2007-2009 Santa Fe vehicles have the same issue and Service Campaign 936 SB-10058931-4495 (TSB# 15-01-031).
The car was in the driveway warming up and caught fire it burned up the starter and starter assembly, the battery wire harness and the manifold. All of this has to be replaced before we can assess any other damages or run a diagnostic.
Car started as usual and I was driving on a city street getting ready to get on the highway. All of a sudden the car would only go about 20 MPH and reach 1000 RPM. It died shortly thereafter on the highway frontage road. All of the lights for ABS, brakes, check engine etc. Came on but the emergency flashers would not work so I had to keep pumping the brakes so nobody would run into the back end of my car. It would not restart so I had to have it towed to the dealer. Dealer stated valve cover gasket had leaked oil onto the alternator and ruined it. That in turn ruined the battery. Car was repaired for $1400 including the tow and a rental car. After looking at Hyundai recalls, I noticed the one for the 2009 vera cruz (NHTSA# 14V415000) in which 61,122 units were recalled for this same problem. …
Electrical complaints in other Sonata years
Frequently asked questions
How common are electrical problems on the 2009 Hyundai Sonata?
NHTSA has 61 complaints about the electrical system of the 2009 Hyundai Sonata, 13% of the model year's 460 complaints. The component named most often is ignition (3 mentions).
Is there a recall for 2009 Hyundai Sonata electrical problems?
No. NHTSA lists no electrical system recall for the 2009 Hyundai Sonata, though it has 2 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 2009 Hyundai Sonata electrical problems start?
Half of the complaints with a recorded mileage happened before about 80,000 miles, and 6% before 25,000 miles.
Is it dangerous?
Owners linked 0 crashes, 3 fires and 2 injuries 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.