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 2018 Kia Sportage owners, lightly cleaned up (personal details are redacted by NHTSA).
On 1/26/2024 approximately 9am, my husband had been driving on the highway for about 2 hours and pulled over to shut his eyes for a few minutes. He shut off the engine, closed his eyes and immediately smelled smoke. Black smoke began coming from under the hood and quickly got worse. He quickly got out of the car and walked away. He heard a loud pop sound and the engine area was engulfed in flames. He called 911. It took about 10 min for the fire dept to arrive and by then, the fire was being fed by the gas in the tank. They tried to put out the fire but the car burnt completely due to the gasoline. No one was hurt, thank goodness. There were no active lawsuits that I could find to get some compensation for this loss. We had to pay our high deductible and lost personal belongings in the car. This car did have an ongoing oil consumption issue. …
Shortly after driving away, before reaching a highway on-ramp, I noticed smoke coming from the vehicle. I turned around and returned to the location. By the time I arrived, the vehicle was emitting black smoke, and shortly after, it was fully engulfed in fire before I could retrieve a fire extinguisher. Vehicle has a documented history of a known manufacturer recall related to an electrical/HECU component and a separate high-pressure fuel pipe recall, both reportedly remedied prior to this incident
When you turn off the car via push button the car engine won't shut off. The computer system shuts down but the engine continues to run. I've taken to the dealership three times to repair and it is still an issue. Engine isn't diesel'ing as the gas pedal still works with the car off. When this happens the vehicles computer system itself is fully off. Kia roadside won't dispatch in this situation as they say "they aren't mechanics". The only thing you can do to shut the car off no matter how many times you attempt to restart is to go inside the engine compartment and pull the fuel pump fuse and starve the engine. There is no difference in engine sound between the on and off computer state, car is quiet so it could be easily missed by someone not paying attention. The car doors will not lock in this situation. …
I was driving and the radio went out along with navigation screen, then power steering went out along with headlights, tail lights. Engine was still running but would not rev up. All kinds of warning lights went off, had a harder time steering vehicle out of the Road way. Engine eventually shut off. My dealer said my starter had a continuous draw on my battery and drained it. This was on 11/10/21. They replaced the starter and the battery. Got vehicle back on 11/10. Last night 11/18/21 I was driving my vehicle again at night and the same thing happened again, no lights, no power steering, no electronics in the vehicle worked. Got someone to jump My vehicle, we let it charge from the jumper and got the vehicle started again. Drove 4 miles down the road, same thing again. …
The oil was leaking somewhere not on the motor not under the car not blowing black smoke. I kept adding oil to it. No oil light. I was told not to park between 2 houses or in my garage it could catch on fire. I took it in several times and they did all kinds of stuff motor wash knock sensor was replaced wiring harness was corroded was slipping out of gear and other issues. And now it doesn't run because of the motor issue and they refused to fix it because I didn't have oil change receipts they are the ones that took care of that there was no oil to change I kept adding it. I have all of the detailed work invoices of what they did to it. I've been without a car for a year now they said it's not under warranty my car has several of the recalls. They wouldn't do all of the stuff they did if it wasn't necessary and trying to locate the problem.
The contact owned a 2018 Kia Sportage. The contact stated while driving at an undisclosed speed, the transmission unexpectedly downshifted into first gear. While attempting to accelerate, the vehicle jerked and briefly lost motive power before slamming into gear. No warning light was illuminated. The contact stated that an abnormal burning odor was coming from under the hood and entered the vehicle through the A/C vents. The vehicle was taken to an independent mechanic; however, no cause for the failure was found. The thermostat and the electric switch on the driver's side window were replaced. The contact stated that while driving uphill or going downhill, the RPM fluctuated, and the engine revved abnormally. The contact stated that the failure persisted. The manufacturer was not notified of the failure. The failure mileage was unknown.
Driver power window regulator stopped working. It is available for inspection upon request. My safety is at risk because it can hinder my ability to exit the car in an emergency. In addition, it is exposing the car's interior and possibly interior electrical parts to the weather elements, and potentially leaving me vulnerable to theft or intrusion. The problem was intermittent at first, and I reported it to the dealer, but at that time of service, they were unable to reproduce the failure. The service department told me this is a fairly common problem with my model of car. The component has not been inspected by Kia, the police, insurance representatives, or others. The symptoms were intermittent at first prior to the total failure. The full failure happened at 101,500 miles, which is past the 100,000 mile warranty expiration.
This vehicle has a safety issue with the headlights. Basically, the low beams for both, driver and passenger sides are not functioning at all. Several diagnostic have been done to repair the existing issue such as replacing new light bulbs, new OEM turn signal switch, replacing whole new headlight assembly for both driver/ passenger sides, checking the relay, replacing new fuses, though, the issue still exists to date and the vehicle is undrivable in the dark. On a side not, only high beam works and turn signals, that is basically it. Several auto service centers have advised me to submit a report as a safety issues since all options have been exhausted. With that said, this safety issue concerning headlight should be addressed with the manufacturer. Thank you for taking this matter seriously!
My 2018 Kia Sportage (VIN [redacted] ) experienced complete engine failure due to low compression/internal combustion chamber failure. The vehicle lost power while driving on Sept 30, 2025, and had to be towed to [redacted] Kia in Dayton, OH. This same dealership previously performed an oil retention test in Aug 2024 which failed, identifying a defective engine. Kia was aware of the issue but declined to replace the engine at that time. The failure pattern matches Kia's known engine defect. Kia Consumer Affairs (Case #25572677) has denied goodwill assistance despite this safety-related engine failure and prior diagnostic documentation.
The plugs for the engine cooling fan and wiring harness were damaged from overheating. No fuses blew, plugs were melted and wiring was discolored from overheating. Estimate for repair was: Parts (cooling fan assembly, and wiring harness)- $2430.19 plus tax, Labor 8hrs @ $175.00/hr- $1400, Total cost to replace the cooling fan and wiring harness- $3830.19 plus tax. Overheating of the wiring harness poses a significant risk of a short circuit and potential engine fire. The problem was identified by the Kia dealer. No warning lamps, blown fuses, or messages warning of the problem. we smelled smoke on a couple of occasions. Unable to afford the repairs, we traded the vehicle in at a Honda dealer.
Electrical complaints in other Sportage years
Frequently asked questions
How common are electrical problems on the 2018 Kia Sportage?
NHTSA has 29 complaints about the electrical system of the 2018 Kia Sportage, 18% of the model year's 164 complaints. The component named most often is ignition › anti-theft › immobilizer/proximity › key/sender (1 mentions).
Is there a recall for 2018 Kia Sportage electrical problems?
No. NHTSA lists no electrical system recall for the 2018 Kia Sportage, though it has 3 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 2018 Kia Sportage electrical problems start?
Half of the complaints with a recorded mileage happened before about 9,000 miles, and 57% before 25,000 miles.
Is it dangerous?
Owners linked 3 crashes, 3 fires and 1 injury 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.