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 2012 Hyundai Sonata Hybrid owners, lightly cleaned up (personal details are redacted by NHTSA).
2012 Hyundai Sonata Hybrid well maintained by original owner, under 130,000 miles. May of 2025 AC stopped working intermittently (Hyundai dealer replaced AC hose). Aug 2025 AC stopped working AGAIN (same dealer could NOT identify problem). Car has consistent Hybrid System Warning! Safely Stop and Do not Drive messages lights and sirens when braking. Code PA186 comes up (low state of charge code for hybrid battery). December 2025 brought car back to SAME Hyundai dealer who NOW says car suddenly needs a 10k transmission (BUT still no idea what PA186 code is related to). Got transmission drained at different shop and NO NEW TRANSMISSION NEEDED! Every repair shop OUTSIDE OF HYUNDAI who has scanned for codes gets the PA186 error and say it is related to HYBRID BATTERY LOW STATE OF CHARGE (I am the original owner THUS lifetime hybrid battery warranty). …
First incident, Sunday, September 9, 2018. While driving, car suddenly flashed warning lights, with message pertaining to the battery. Car decelerated extremely rapidly and became harder to steer. Pulled car over out of street as it lost power. It stopped. Lights remained on. Turned car off and then turned it back on. It cranked up and could be driven as if the incident never happened. There were no warning lights or warning message when the car was restarted. Second incident, Monday, September 10, 2018. While driving the car to the dealership for diagnosis of the problem, the car suddenly lost power again, the warning lights flashed again, and again it became hard to steer. This time driver was not able to pull the car over; it stopped in the street. Driver turned the car off, then turned it back on and drove to the nearest service station. …
The car was at a stop light and burst into flames, all of the sonatas have this problem, all sonatas will at the least burn up the engines, transmissions, or batteries due to this problem. Out of 35 sonatas tested 35 had this problem. Contacted Hyundai USA, Hyundai fullerton, Hyundai consumer complaint line and they refuse to do anything about it . Every Sonata hybird in the world, (to the best of my knowledge) will burn up the engine, transmission, or lithium batteries (which will catch fire) between 70,000 &120,000 miles, Hyundai will not warranty the failure, this is caused by a manufacture defect.. …
While driving the car on the freeway, it will jerk forward and then shortly after lose power. The car shows the battery as being barely charged. I pull over (luckily haven't been killed yet) on the side of the freeway. Let the car sit for a few minutes, restart it and the battery is half full and the car is driveable. I've read online that this is a common issue with 2012 Hyundai Sonata hybrids. I've taken my car to a Hyundai dealership twice, and they can't find anything wrong, diagnostics show its fine. The second time I took it in they replaced the battery located in my trunk for $485. That did nothing, as the car is still randomly shutting off, and most times in the most dangerous areas of the road. I don't think Hyundai will do anything about this until numerous people are killed. Forgot to mention that sometimes when it shuts down the check oil light comes on. …
Tl* the contact owns a 2012 Hyundai Sonata Hybrid. The contact heard an abnormal noise coming from the engine compartment. While driving approximately 70 MPH, the vehicle suddenly decelerated and the "Hybrid pull over soon" warning indicator flashed. The vehicle stalled and was able to be coasted to the side of the road. The vehicle failed to restart and was towed to an independent mechanic who diagnosed that the Hybrid battery needed to be replaced. The dealer (dicksmith Hyundai, 781 congaree rd, greenville, sc 29607) indicated that the motor assembly needed to be replaced. The vehicle was not repaired. The dealer and the manufacturer indicated that the vehicle was excluded from any recall campaigns. The approximate failure mileage was 97,000.
After I exited the freeway while traveling to my mothers on thanksgiving day I was stopped at a light to turn left onto a street and when I tried to go the car would not move I had to push the gas peddle all the way down and when it finally went it jumped/jerked really bad which almost caused me to hit the car in front of me and after that it was going really slow. 2 days prior the car was lagging while slowing down to break seemed like the system wasn't reading that I want to slow down and stop which again almost caused me to have an accident. This car is a safety hazard and I only have 61,000 miles and I only had the car for 9 months. I was told it was the transmission and the car is still in the shop trying to figure out what is wrong.
Tl* the contact owns a 2012 Hyundai Sonata Hybrid. When shifting into reverse or drive, the vehicle jerked violently. In addition, while driving 15-20 MPH, a chime sounded and the 'safely stop and do not drive' warning message appeared on the message board. The failure recurred multiple times. The vehicle was taken to a dealer where it was diagnosed that the oil pump or the computer module failed. The vehicle was not repaired. The vehicle was not included in a manufacturers recall that was related to the failure. The approximate failure mileage was 71,415.
Yesterday the car drove fine untill about an hour before I went home. Then it started with the bumping/jerking when switching from electric to gas. Worse than it has ever been. Then the revving started, more than usual, and wouldn't accelerate. Then it was like the throttle stuck. Got the revving noice, but the eco wasn't burried at red, for about 1/4 mile before I was able to pull over into a parking lot. Shut off the car. Restarted and drove 1 mile to home. Revved a few times in that period.
Tl* the contact owns a 2012 Hyundai Sonata Hybrid. While driving 45 MPH, the vehicle lost power and came to a complete halt. In addition, the accelerator pedal was depressed but the vehicle failed to accelerate. "Hybrid battery low, shift to park position" was displayed across the message board. The failure recurred on numerous occasions. The vehicle was towed to a dealer, but was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was 62,000.
Tl* the contact owns a 2012 Hyundai Sonata Hybrid. The contact stated that the vehicle made an abnormal noise while driving approximately 55 MPH. In addition, the charging system warning indicator illuminated. The vehicle was towed to autonation Hyundai mall of georgia (located at 3445 buford dr, buford, ga) where it was diagnosed that the compressor failed and needed to be replaced. The manufacturer was notified of the failure. The failure mileage was 70,000.
NHTSA investigations
Non-crash Vehicle Fires
During this Preliminary Evaluation (PE), the Office of Defects Investigation (ODI) assessed the scope, frequency and potential safety-related consequences of non-crash vehicle fires caused by both engine failures and failures of other vehicle systems/components in model year (MY) 2011-2014 Hyundai Sonata and Santa Fe vehicles equipped with Theta II and Lambda II engines (approximately 1.3 million vehicles).
Pedestrian alert sounds
NHTSA received a petition on or about July 18, 2022, requesting that Federal Motor Vehicle Safety Standard (FMVSS) 141 be applied to all electric and hybrid vehicles operating in the United States. The petition can be reviewed at NHTSA.gov under ODI Number 11486072. FMVSS 141 establishes performance requirements for pedestrian alert sounds for motor vehicles.
Non-crash Vehicle Fires
In a letter dated June 11, 2018, the Center for Auto Safety (CAS) petitioned the National Highway Traffic Safety Administration (NHTSA) to initiate a safety defect investigation into non-collision related fires on model year (MY) 2011-2014 Kia Optima and Sorento, and Hyundai Sonata and Santa Fe vehicles. In a letter dated July 24, 2018, CAS requested that MY 2010-2015 Kia Soul vehicles be added to the petition.
Electrical complaints in other Sonata Hybrid years
Frequently asked questions
How common are electrical problems on the 2012 Hyundai Sonata Hybrid?
NHTSA has 23 complaints about the electrical system of the 2012 Hyundai Sonata Hybrid, 15% of the model year's 154 complaints. The component named most often is 12v/24v/48v battery (1 mentions).
Is there a recall for 2012 Hyundai Sonata Hybrid electrical problems?
No. NHTSA lists no electrical system recall for the 2012 Hyundai Sonata Hybrid, though it has 6 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 2012 Hyundai Sonata Hybrid electrical problems start?
Half of the complaints with a recorded mileage happened before about 70,000 miles, and 33% before 25,000 miles.
Is it dangerous?
Owners linked 0 crashes, 1 fire and 0 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.