Which parts fail
Components named in complaints (engine, cooling system, oil leaks, timing chain, exhaust).
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 while driving 50 MPH, the vehicle inadvertently lost motive power and stalled. There was no warning light illuminated. The vehicle failed to restart. The contact pushed the vehicle to the side of the road with the assistance of her father. The vehicle was towed to an independent mechanic who referred the contact to the local dealer. The vehicle was then towed to the local dealer where it was diagnosed that the fuel pump needed to be replaced. The fuel pump was replaced; however, the failure persisted. The dealer then diagnosed that the gasoline needed to be pumped out. The repair was completed; however, the failure recurred. The battery was replaced; however, the failure persisted. The dealer diagnosed that the engine needed to be replaced. The vehicle was not repaired. …
5/18/24 in the afternoon, driving the car on freeway. the car lost power. AC stopped. Heat and check engine lights came on. Pulled car to shoulder. Driver's window was foggy. Smoke coming from front. Exited the car. Flames seen underneath front of car and passenger compartment. Smoke worsened and within minutes 10 foot high flames engulfed the car. Fire department had to extinguish the flames. And California Highway Patrol blocked off several lanes. The vehicle totally was incinerated. I filed a police report number 240518LA2144. I do not have the report yet. It is not ready. It was filed with the California highway patrol.
Vehicle sat in driveway for one week while on cruise. The day of return the sonata caught on fire without any person touching the car for one week. Brother who's house it was at was woken by neighbors at 7sm. Home had minor damage, but it could of been bad if it was in someone's garage. Fire started in engine and console. Fire department could not find out a reason. Car was totaled. Had to rent a car to get home that was 2 hours away. Never had an issue with this vehicle in the 12 years I owned it.
The contact owns a 2009 Hyundai Sonata. The contact stated while attempting to start the vehicle, the vehicle failed to start. The contact stated that the check engine warning light was illuminated. The vehicle was jump-started and driven to a local mechanic where it was diagnosed with engine failure. The vehicle was not repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 193,000.
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).
Tl* the contact owned a 2009 Hyundai Sonata. While driving 60 MPH, the engine compartment spontaneously caught on fire without warning. There were no injuries. The fire department extinguished the fire. A police report was filed. The vehicle was towed to an independent mechanic and deemed a total loss by the mechanic. The local dealer and manufacturer were not contacted. The vehicle was not diagnosed. The failure mileage was 130,000. ..
Takata recall. Accident happened on a highway going 60 miles an hour. A deer came out of the ditch, missed the deer. My daughter swerved into the ditch and launched over a gravel road and did a nose dive into a bean field. Crashing the front end of the car. The car is totaled.
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. …
NHTSA investigations
Loss of Motive Power
The National Highway Traffic Safety Administration (NHTSA) received a letter dated July 13, 2022, petitioning the Agency to initiate a safety defect investigation into loss of motive power allegations attributed to oil drain pan assembly failures on certain Hyundai Motor America, Inc. and Kia America, Inc. vehicles spanning Model Years (MY) 2005-2021.
Engine complaints in other Sonata years
Frequently asked questions
How common are engine problems on the 2009 Hyundai Sonata?
NHTSA has 62 complaints about the engine & cooling of the 2009 Hyundai Sonata, 13% of the model year's 460 complaints. The component named most often is cooling system (2 mentions).
Is there a recall for 2009 Hyundai Sonata engine problems?
No. NHTSA lists no engine & cooling 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 engine problems start?
Half of the complaints with a recorded mileage happened before about 99,000 miles, and 12% before 25,000 miles.
Is it dangerous?
Owners linked 2 crashes, 3 fires and 4 injuries to engine & cooling 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.