Kia Niro Problems — All Years, Common Issues & Reliability

Intermittent warning to "Refill Inverter Coolant" displays on the dash screen. This is a known issue pursuant to SA512 (ELE 270 Rev 3) due to faulty coolant that crystallizes and interferes with the sensor. However, per Kia, it is only covered under standard warranty (5 years/60k miles) and while my vehicle is within the year warranty, it is over the mileage. Quote was to replace "Chiller, water pump and flush coolant system" at a cost of $2369.02 including parts and labor. Dealership will not perform recommended maintenance of coolant flush (every 37k miles) without replacing these parts. If this was a known defect why is there a limitation to the SA? It should be covered as a recall, not a voluntary service alert. I am unable to properly monitor the in-dash warnings regarding coolant levels until this problem is fixed

The contact owns a 2023 Kia Niro. The contact stated that while driving at 25 MPH, the vehicle independently accelerated. The contact constantly depressed the brake pedal to stop the vehicle. The contact was able to coast the vehicle to the residence while depressing the brake pedal to prevent the unintended acceleration. Neither a dealer nor an independent mechanic was contacted. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 11,000.

On now 4 occasions--intermittently my car will go into drive when shifted into the reverse shift I don't know what component is impacting this. My safety and others safety is at risk by my car literally going forward when it's supposed to be in reverse. I've taken my car to the dealership two times and they have not been able to recreate it or fix anything. I've reached out to KIA corporate for a resolution but have not gotten follow up: Case#XXX (case where I was supposed to get a response from a case manger) and XXX (original case). To my knowledge I don't know if it's been inspected by the manufacturer, police, insurance representatives or others No warning lamps or signs. It happens intermittently and seemingly no rhyme or reason when it happens. This happened back in November 2025 and most recently this April.

The vehicle has a recurring P0420 code (“Catalyst System Efficiency Below Threshold Bank 1”). A boroscope inspection at Ricardo Caballero Kia Santa Isabel (invoice #[XXX] dated December 5, 2025) confirmed internal disintegration of the catalytic converter, with physical pieces of the catalyst falling out when the exhaust pipe was removed. This failure appears related to Recall 23V534 (SC276) and TSB PS709 (overheating / coolant boiling issues in 2017-2022 Niro Hybrid models). Motorambar, Inc. (official Kia distributor in Puerto Rico) has ignored my warranty claim since December 2 and December 22, 2025 (more than four months). Motorambar is now refusing to authorize a courtesy loaner vehicle at the dealer Ricardo Caballero Kia Santa Isabel, claiming the tests will take less than 5 days. This leaves me without transportation. The catalytic converter is fully covered under the Federal Emissions Warranty (8 years / 80,000 miles). I request that NHTSA investigate this as a potential safety and emissions defect and require Kia / Motorambar to: 1. Immediately repair or replace the catalytic converter under warranty at no cost. 2. Provide a courtesy loaner vehicle during the repair. 3. Reimburse previous diagnostic costs of $449.17. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

I believe the issue is related to something connected to the AC system or a component underneath the hood. The exact part that malfunctioned has not been confirmed. The vehicle is available for inspection upon request. My safety and the safety of others were put at risk because some kind of leak or fumes were being sent into the car through the AC vents, causing myself and others in the vehicle to feel sick. I have taken the car to 3 Kia Dealerships. All of which have been extremely dishonest (have tons of proof) and say they cannot verify problem. I took it to an outside independent shop and they verified it instantly and wrote a very detailed invoice about the problem. They couldnt pin point where it was coming from though. The vehicle has only been inspected by the 3 Kia Dealerships and the independant shop Brake Busters I purchased the car in November of 2025 and had no problems until February 22nd 2026. No warnihg lights or messages came on prior. The symtoms that started were Nausea, Headaches, light headedness, vision blurry, and almost caused me to pass out at wheel several times.

The interior surface of the windshield freezes during cold weather operation, beginning at the edges of the windshield and progressing toward the center directly into the driver’s line of sight. This significantly impairs visibility and requires approximately 20–30 minutes of vehicle warming before safe operation is possible. The condition has occurred repeatedly since November under normal winter temperatures. No warning lights or system messages appear prior to the event. The vehicle has fewer than 8,000 miles. The vehicle has been inspected multiple times by authorized dealerships. Three separate dealerships performed diagnostics and preventative service, including cleaning A/C drains and ventilation components; however, the condition persists. Dealership personnel advised they could not open a technical case unless the freezing could be observed in person, which has prevented further escalation because the condition is temperature-dependent. Photos and videos documenting the freezing have been provided to the manufacturer and dealerships. The issue has not been resolved and continues to present a safety concern because driver visibility is obstructed during normal winter driving conditions. The suspected cause is improper windshield installation or sealing allowing moisture intrusion, although the exact failure mechanism remains unconfirmed.

I visited Car Pros Kia Tacoma for a wheel alignment on my 2025 Kia Niro EV. After the service, I was told the alignment was completed correctly and I was given a printout showing all values in the green. However, the vehicle did not feel stable or safe to drive afterward. The steering felt off, and the car did not track straight. Because the vehicle felt unsafe, I took it to Firestone the next day for a second opinion. Firestone performed a full alignment check and their “before” measurements showed that the alignment was significantly out of specification, including major issues with front toe, rear toe, and thrust angle. These values were far outside normal ranges and could affect handling and safety. Firestone then corrected the alignment, and their “after” measurements showed the vehicle was properly aligned and driving normally again. Their report clearly shows the difference between the unsafe alignment I received from Kia and the corrected alignment they performed. In summary: • Kia performed an alignment that was not actually within proper specifications. • I was told the alignment was correct when it was not. • The vehicle felt unsafe to drive after Kia’s service. • Firestone’s diagnostic confirmed the alignment was significantly off. • Firestone corrected the alignment and the vehicle immediately drove normally. I am filing this complaint because the dealership returned my vehicle in a condition that affected its stability and safety, and the documentation from Firestone clearly supports this.

The vehicle is a rental vehicle. It experienced two incidents of sudden loss of propulsion within the first two days of operation. During both events, the vehicle became completely unresponsive to accelerator pedal input and would not move despite being placed in Drive. I attempted to shift the vehicle into Park and then back into Drive, but propulsion was not restored. No warning lights, malfunction indicators, or system messages were displayed before or during the failure. The first incident occurred while exiting a car wash. The vehicle became immobilized in an active traffic lane and would not respond to throttle input, creating an immediate risk of rear-end collision. Vehicles were approaching from behind and I narrowly avoided being struck. The second incident occurred later the same day in a parking lot while the vehicle was charging. Again, the vehicle became unresponsive without warning and would not move. The intermittent and unpredictable loss of motive power presents a serious safety hazard because it prevents the driver from maintaining control and safely operating the vehicle in traffic conditions.

I bought my Niro hybrid EX Touring new from the dealership in 2023. The first issue arose when the car shut off completely while driving and was towed to the dealership. Later, I started hearing a squeaking/rubber rubbing sound. The car would make squeaking and creaking noises when turning or going over minor bumps. The "rubber rubbing sound" happened when I was at a full stop, right after removing my foot from the brake, as the car began to move forward. These issues were both reported to the dealership, and they did an inspection. The dealership service center has been able to hear the sounds. Since then, the calliper boots have been replaced multiple times and the full calliper kit once. The strut bearing has also been replaced multiple times. Consistent issues with the car's braking system is a significant safety issue. I have no idea what damage the rest of my car could have sustained, and I have not been able to get an answer for why this is happening. I have also been in contact with the manufacturer.

I am filing a complaint regarding my 2023 Kia Niro and Safety Recall SC332. The recall involves a damaged floor wiring assembly that may prevent proper airbag and seat belt deployment, creating a serious safety risk. I scheduled and brought my vehicle to Cowboy Kia, Conroe on Feb 2,2026 specifically to have this recall repaired, but the dealership did not complete the recall service and returned the vehicle without fixing the issue or providing a clear explanation. This is a manufacturer-issued safety recall and should be addressed promptly at no cost. I am requesting immediate repair and an explanation for the failure to perform the recall work.

The contact owns a 2022 Kia Niro. The contact stated that the rearview camera displayed a distorted image while the vehicle was in reverse(R). The failure obstructed the driver's visibility, preventing the driver from safely operating the vehicle. Additionally, there was a delay with the image appearing on the screen when the vehicle was in reverse(R). The vehicle was taken to the dealer, but it was unknown if the vehicle was repaired. The contact stated that on a separate occasion, the vehicle failed to start up, with the check engine warning light illuminated. The vehicle was taken to the dealer, where it was diagnosed that the battery terminals were loose. The vehicle was repaired; however, when the contact arrived to retrieve the vehicle, the vehicle failed to start. The dealer inspected the vehicle; however, no cause for the failure was found. The contact was informed by the dealer that the vehicle had an open recall, NHTSA Campaign Number: 25V426000 (BACK OVER PREVENTION). The vehicle remained at the dealer unrepaired. The manufacturer was not notified of the failure. The failure mileage was approximately 45,000.

I did an OTA update that made the rear view camera work intermittently. It would just flash an image every couple of seconds instead of a live stream. I took it into the dealer, and on the way, it totally gave out in the middle of traffic in a very unsafe way. I was flashed with many warning signs and was not able to get it started again for 5min by just turning it on/off again. I finally got it to the dealer and after 6 weeks they told me that something spilled in the cup holders and fried the backup camera and drivetrain components. I find it extremely off the drivetrain and safety critical components are stored under a cup holder with no protection.