Kia Optima overheating problems

Filed Nov 3, 2026 · Engine · 110,000 miles · AL

The contact owns a 2012 Kia Optima. The contact stated that upon turning the ignition to the on position without starting the vehicle, the engine started overheating with smoke coming from underneath the hood. The vehicle was towed to the dealer and was repaired under the federal safety agency Campaign Number: 23V652000 (Service Brakes, Hydraulic); however, the failure persisted. The dealer informed the contact that the wiring harness and coil packs needed to be replaced because the repair was not covered under recall. The manufacturer was notified of the failure by phone and confirmed the assessment of the dealer. The failure mileage was approximately 110,000.

Filed Oct 8, 2026 · Electrical · TX · 1 injury

On August 20, 2026, while my minor son and I were inside my 2020 Kia Optima LX, strong burning odors and fumes entered the passenger compartment through the HVAC vents. No dashboard warning lights or messages appeared before or during the incident. Although no visible flames were observed, I suspected an electrical component was overheating or melting, creating a potential fire and respiratory hazard. My son has asthma and experienced coughing and shortness of breath throughout that day, requiring use of his prescribed rescue inhaler. Neither of us received immediate medical treatment. Due to safety concerns, I had the vehicle towed to R&E Auto Repair on August 21, 2026, rather than risk driving it. The independent repair facility documented suspected melting of the HVAC temperature control unit and identified the blower motor resistor as a possible contributing component. Video evidence of the suspected damage was obtained. I formally reported the incident to Kia Customer Care on September 1, 2026. The vehicle was delivered to authorized dealer DeMontrond Kia on September 23, 2026, for further inspection. Despite the independent findings, Kia's dealership reported that it could not identify melted components. The suspected defect remains unresolved. The vehicle remains at DeMontrond Kia and may be available for inspection. I have not been advised whether any affected components have been removed or replaced. No police or insurance inspection has been reported. I am concerned about potential electrical fire hazards, fumes entering the passenger compartment, and respiratory injuries to occupants. I request that the federal safety agency investigate this suspected HVAC electrical defect and potential safety risk to other Kia owners.

Filed Oct 5, 2026 · Brakes, Engine · MS

The contact owns a 2014 Kia Optima. The contact stated that after leaving the vehicle parked for approximately 4 hours, the contact returned to the vehicle and the engine running even though the vehicle was turned off. While driving approximately 30 MPH, the traction control light, ABS, and the parking brake light were illuminated. The contact stopped, parked the vehicle, and restarted the vehicle, attempting to reset the vehicle; however, the lights remained illuminated. While the vehicle was at the residence a family member disconnected the battery and used water on the body of the vehicle closest to the steering wheel underneath the hood of the vehicle. The contact was advised by the family member not to drive the vehicle because of the overheating.

Filed Aug 25, 2026 · Electrical, Lights · FL · crash

Vehicle was purchased in 2023. AC blower failure occurred for the first time in June 2024 and was repaired by PepBoys. On 4/2/2025 the ve3hicle had an active recall event when the engine seized on the highway because of a faulty oil pump/filter, Engine was replaced 4/17/2025 under that recall. Kia advised at the time that the wiring harness should be replaced due to electrical issues at the time but said that there was no recall for that work. At the time, there were no electrical failures of steering, brakes, all power etc. Nor did we know that those were a possibility. The wiring harness quote was $7,000, over the cost of the vehicle. It was decided to continue repairing the electrical issues as they came up, it was assumed that the fuses would blow before there because a safety or total vehicle failure, as automobiles are designed that way. 8/4/2026 the vehicle experienced a complete and total loss of power resulting in a traffic crash into another vehicle as the brakes felt like you were trying to push a wall rather than a pedal. There was minimal physical damage to the other car and the kia, the other driver got my husband's insurance information and then drove off. The car did startup after ~30 minutes or so and was driven home, but taken to the Kia dealership the next day. It was said that the blower motor overheated and melted a portion of the electrical junction box under the hood and that it was unsafe and dangerous to drive. Kia said that there were no active recalls for this work. the federal safety agency SC351 seems very similar to this issue that has plagued this car since the beginning. We would ask that Kia incorporate this vehicle and others outside of the year/model ranges in SC351 that have similar failure mechanisms as this seems common.

Filed Aug 7, 2026 · Engine · GA

I am requesting urgent assistance regarding my 2017 Kia Optima EX, which is experiencing a serious oil consumption/burning issue. The vehicle is burning oil into the engine, causing the oil level to continually decrease and creating a significant concern for engine failure, overheating, or a potential vehicle fire. I am extremely concerned about my safety and the safety of others because I depend on this vehicle every day. This is also my only vehicle, and I am still making payments on the financing. I do not have the financial ability to simply purchase another vehicle or take on a new car payment. I am asking Kia to please take this matter seriously and investigate the vehicle as soon as possible. I am requesting that Kia review whether there is a known engine issue, applicable warranty or assistance, recall/campaign coverage, or any other program that could help with the necessary repairs or engine replacement. I cannot afford to lose my only means of transportation because of an engine problem that is beyond my ability to financially resolve. I am asking Kia to work with me toward a safe and reasonable solution as urgently as possible. Thank you [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jun 25, 2026 · Engine · MO

The car burns oil within a week of getting an oil change. It was only driven a 200 miles before all of the oil was burned out. This has been a consistent issue with this car that the oil burns at an extreme rate. This is a safety risk as it could lead to engine overheating, the engine could stall out due to the fast burning of the oil, or a potential fire hazard while driving. The oil light will come on for a second and at that point, the oil is already EXTREMELY too low. I brought the car to the mechanic and they have told me multiple times that there is no leak or anything. The mechanic says that the car simply is burning oil too fast.

Filed Mar 7, 2026 · Engine · AZ

Issue: My 2014 Kia Optima has repeatedly experienced overheating, flashing check‑engine light, and loss of coolant. The dealership has misdiagnosed the issue multiple times and returned the vehicle to me in unsafe condition. Safety Concern: The vehicle overheats while driving, the check‑engine light flashes, and the engine loses power. This creates a serious risk of engine failure while on the road. I am concerned about potential engine damage, stalling, or fire risk due to overheating.

Filed Mar 3, 2026 · Engine · 124,000 miles · PA

The contact owns a 2015 Kia Optima. The contact stated that while driving at 40 MPH, there was smoke coming from underneath the hood, and the engine overheated. The check engine warning light was illuminated. The contact was able to pull over to the side of the road and add coolant to the coolant reservoir. The vehicle slowly started and was driven to the destination. The contact stated that the engine was overheating if driven for more than 10 minutes. The vehicle was taken to an independent mechanic, where it was determined that the vehicle was experiencing excessive coolant consumption, and coolant was added as needed. The mechanic determined that the failure might be related to the engine. The vehicle failed to start and was undrivable. The vehicle was not repaired. The dealer was contacted and referred the contact to the manufacturer for assistance. The manufacturer was contacted, and a case was filed. The failure mileage was approximately 124,000.

Filed Nov 19, 2025 · Engine, Fuel system · CO · fire

While driving, the vehicle suddenly developed a loud knocking noise from the engine. Within one block the vehicle began smoking heavily from under the hood. I pulled over, opened the hood, and flames were visible. This is a 2016 Kia Optima with the 2.4L Theta II engine. Approximately one year ago the original engine seized and was replaced by a Kia dealer under the Theta II engine recall (SC172/SC147) and class-action settlement. This is the second catastrophic failure of a Theta II engine in this vehicle. The replacement engine has now failed in the exact same manner as the thousands of other documented cases — rod bearing failure leading to knocking, overheating, and engine compartment fire. The dealership (Fowler Kia of Windsor, CO) inspected the vehicle and quoted over $6,000 in repairs (melted engine wiring harness, ECM connector, battery cables, airbox, intake boot, etc.) while claiming the fire was “unknown cause/not the engine,” despite the clear knocking immediately preceding the fire. Kia Consumer Affairs has an open case but has not yet resolved coverage. This is a known, ongoing safety defect covered under multiple the federal safety agency investigations (PE21004, EA22002) and Kia recalls. I no longer feel safe in this vehicle and am requesting immediate investigation and inclusion in any expanded recall or remedy.

Filed Jun 9, 2025 · Engine · 133,997 miles · MD

The contact owns a 2013 Kia Optima. The contact stated that the engine was replaced four years ago. The contact stated that the engine had not been running correctly since the engine was replaced. The contact stated that the engine was overheating, and there were several unknown warning lights illuminated. The contact stated that most recently the head gasket failed. The contact had taken the vehicle to a local dealer; however, the dealer was unable to diagnose the vehicle. The vehicle was not repaired. The contact stated that the vehicle had been taken to the same dealer several times. The contact stated that the dealer had the vehicle towed back to the residence and declined perform any further repairs. The manufacturer was informed of the failure. The failure mileage was 133,997.