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 Kia Optima owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2012 Kia Optima. The contact received notification of NHTSA Campaign Number: 23V652000 (Service Brakes, Hydraulic) however, the part to do the recall repair was not yet available. The contact stated that while starting the vehicle, she noticed smoke coming from underneath the hood of the vehicle. Additionally, the contact stated that the taillights remained illuminated while the vehicle was turned off. There was no warning light illuminated. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue, but no assistance was provided. The failure mileage was approximately 130,000. VIN tool confirms parts not available.
I was driving down the highway going 75 mph and all of a sudden my car tells me pull over safely do not drive and it shut down while I'm driving. It never turned back on. It started smoking and you could see orange light coming through the vents. I was stuck on a [redacted] bridge for 4 hours and I missed court that day. I called Kia and they came to pick up my car. They said it was free because my car has been recalled but ever since they've had it, they stop answering my phone calls and emails and now they are trying to charge me 5000 to get my car back and fixed. Before any of this happened, I noticed an oil leak at the gas station but was unsure whether it came from my car or not.
Vehicle is under recall 23V652 for HECU short circuit issue. Vehicle was running fine, driven to local mechanic for routine oil change and inspection. MIL was on with P0445 indicating a short circuit on Purge control valve. Mechanic replaced Purge control valve which did not reset maintenance light. Mechanic investigated and found evidence of a thermal event (fire) within the wiring harness near the computer. Mechanic contacted me and I notified him of Interim Recall notice. Vehicle was towed to local Kia dealer where they will not honor recall as there is no current solution. They said they can not prove the incident was HECU without replacing wiring harness which I must pay for.
The contact owns a 2012 Kia Optima. The contact stated while driving downhill at approximately 40-45 MPH, the vehicle shut off. The battery, oil, and check engine warning lights were illuminated. The brake pedal was depressed, but the pedal was firm. There was an abnormal clicking sound coming from the vehicle. There was smoke coming from the engine. The contact attempted to turn off the vehicle; however, the transmission failed to shift to park. The vehicle was towed to the residence. The dealer was contacted, but the vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 154,782.
The contact owns a 2012 Kia Optima. The contact stated the vehicle was taken to the dealer, where the recall repair of NHTSA Campaign Number: 23V652000(Service Brakes, Hydraulic) was performed; however, after the repair, the A/C system became inoperable, and the front passenger's side window failed to roll up or down when engaging the power window switch. The dealer was notified of the failure, but did not provide any assistance. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was approximately 100,000.
My car caught on fire while driving from somewhere near the engine. The fire was so severe that fire department nor my insurance company were able to determine cause of fire and I'd only had vehicle for 45 days, it was a single owner with no accidents and maintained its entire life up to that point. I am requesting someone to examine vehicle and tell me how this possibly happened.
Unknown but We were driving home from friant in motion when the car died and started smoking, no indication light were on before until after the incident all warning lights were on dash. Our lives were put at risk due to this. We were not able to control steering wheel or to get out of the way of traffic.
The contact owns a 2012 Kia Optima. The contact stated that while driving at 30 MPH, the contact pressed on the horn, and the horn failed to function as intended. No warning lights were illuminated. The contact stated that on a separate occasion, upon starting the vehicle and attempting to adjust the driver's side mirror, there was an abnormal clicking sound coming from the side-view mirror motor. The contact stated that several days later, the abnormal clicking sound ceased, and the driver's side mirror failed to function as intended. On a separate occasion, the passenger's side mirror motor was making an abnormal clicking sound. Several days later, the clicking sound ceased and the passenger's side mirror failed to function as intended. No warning lights were illuminated. …
On August 25th around 7:00 PM, the vehicle suddenly caught fire while parked after a short test drive. The car had just been purchased a few days prior and was taken to a mechanic for a precautionary inspection. During the test drive, the mechanic parked the vehicle in a residential driveway. After backing in, smoke was observed coming from the engine bay. When the hood was lifted, the engine area was already on fire. The fire department was called immediately and was able to extinguish the flames before the fire spread to surrounding property. The fire completely destroyed the vehicle. The vehicle had no warning lights, unusual performance issues, or prior signs of trouble, and it appeared to be in good condition prior to the incident. This fire posed a serious safety hazard and could have resulted in injury or property damage. …
The contact owned a 2012 Kia Optima. The contact stated while driving 50-60 MPH, the vehicle experienced excessive steering efforts, which required keeping both hands on the steering wheel to prevent the vehicle from drifting out of the lane. The contact stated that the failure recurred while driving on one occasion, causing the passenger's side-view mirror to strike another vehicle, and the side-view mirror was damaged. There was no injury sustained. A Police report was filed, but the police report information was not available. Additionally, the contact stated that after the vehicle had been turned off for 10 minutes, the vehicle failed to restart and was jumpstarted. The contact stated that the failures recurred several times. The vehicle was taken to an unknown dealer, where it was diagnosed with steering and electrical failures. The vehicle was not repaired and was sold. …
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 Kia Optima, MY 2011-2014 Kia Sorento and MY 2010-2015 Kia Soul vehicles equipped with Theta II, Gamma, Nu and Lambda II engines…
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 Optima years
Frequently asked questions
How common are electrical problems on the 2012 Kia Optima?
NHTSA has 122 complaints about the electrical system of the 2012 Kia Optima, 13% of the model year's 920 complaints. The component named most often is horn (1 mentions).
Is there a recall for 2012 Kia Optima electrical problems?
No. NHTSA lists no electrical system recall for the 2012 Kia Optima, 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 2012 Kia Optima electrical problems start?
Half of the complaints with a recorded mileage happened before about 79,000 miles, and 18% before 25,000 miles.
Is it dangerous?
Owners linked 4 crashes, 18 fires and 7 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.