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 2017 Kia Niro owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2017 Kia Niro. The contact stated that while driving 60 MPH on the highway, the vehicle jolted and shook abnormally. The electrical system warning light illuminated, and the vehicle lost partial power. The engine and hybrid warning lights were illuminated. The vehicle was coasted off the roadway to a gas station. The vehicle was towed to the local dealer, where it was diagnosed with a blown high-voltage fuse. The vehicle was repaired with a higher voltage fuse. The manufacturer was contacted and opened a case. The approximate failure mileage was 101,000. The VIN was not available.
The contact owns a 2017 Kia Niro. The contact stated while driving at an undisclosed speed, the check hybrid system warning light illuminated, and the hybrid system seized. The vehicle was towed to the dealer where it was diagnosed with power relay assembly failure. The contact was informed that the power relay assembly needed to be replaced. The vehicle was taken to the dealer to be repaired. The contact referenced Technical Service Bulletin: SC256 as a possible fix for the failure. The manufacturer was not made aware of the failure. The failure mileage was approximately 87,000.
During first recall 18V-666, Kia stated that I received a new PRA in September 2019 per recall instructions. July 2023, my car would not turn on and was sent to same Kia dealership. Recall 22V-836 applies to my car, and my PRA shows sign of thermal damage yet again. Both main relays that were replaced in 2019 were of Panasonic, yet, the PRA was melted to the point that the wire harness also needs replacing. This is 2 fire incidences in my 2017 Kia Niro in less than 3.5 years, on the same part.
Back seat got warm & later that morning car engine would not start but lights in vehicle came on. Appt made w/dealer who after a week hadn't done diagnostics nor checked battery & main hybrid fuse as I had requested. I towed to a service garage who upon starting to open the box covering battery, found battery had kindof exploded & bulged. I searched online for recalls on 12/7/22 and found a recall 11/10/22 -22V836000 (KIAs # is SC256) which is "Main Relay within Power Relay Assembly (PRA) may have inadequate connections between its contacts, causing increased electrical resistance, which can overheat the rear seats." "This recall supersedes NHTSA recall number 18V-666. Vehicles already repaired under the previous recall will need to have the new remedy completed" I have receipt showing I had did the 1st recall but the recall is not showing up when I search my VIN#. …
I was driving and the car was stuttering. Then after I stopped for a bit it resumed normal operations. Then the warning light came on, then it went off again. This happened for a couple of weeks until finally, while on a road trip at the end of July 2023, the car seemed to just lose power in 4th gear and I would have to really rev the engine just to keep it moving, that happened while on a road trip. I called the dealership several times during the trip and they said I'd already had the computer recall reset so they didn't think it made any sense. I took it to my neighborhood repair shop when I got back and they said two spark plugs are shot, they replaced them and it ran fine. But now it's stuttering again, just a few months later. I called the dealership again and they said I could bring it it for a diagnostic (not free) and then I got a letter about a recall. …
I have had ongoing electrical issues with my 2017 Kia Niro. First, the back passenger (driver side window) was working intermittently. The back windows from the day I bought the car brand new are rarely used, but when it was used for the 3rd or 4th time I had already gone over the miles where it would have been covered. The dealership was going to charge me almost $300, so I never fixed it. I just don't use the back windows. Then, the driver side low beam bulb kept going out. Erlich Kia in Longmont kept replacing the bulb despite my concerns of it being an electrical issue. Finally, the dealership was transitioned to Fowler Kia. By that time the issue was no longer going to be covered. Fowler eventually determined that the socket and harness assembly needed to be replaced. That was last year. Now, the passenger side headlight is having the same exact issue. …
The vehicle's hydraulic clutch actuator (HCA) has failed and is actively leaking fluid onto the printed circuit board (PCB), creating an immediate electrical short and engine bay fire hazard. This failure is identical to the defect detailed in Safety Recall SC276 (NHTSA Campaign 23V534). As indicated by a search of my VIN, the vehicle was brought in by us previously when we learned there was a recall, and the recall was officially marked "completed" in the NHTSA database. However, the dealership at the time claimed the vehicle was not affected by the recall, stating there was nothing wrong. They simply performed the minor step of changing a fuse to mark it as completed but did not provide an actual remedy or replacement for the actuator assembly itself. The original manufacturing defect has now actively manifested, causing a severe, active fire risk. …
My car slowed, smelled hot, and then transmission overheat light came on approximately 130 miles from my home. I had it towed to nearest Kia service due to my warranty, Lehighton Kia dealer by AAA (Kia roadside wanted $293). Dealer claimed it was Clutch Actuator (said nothing about recall) and claim to be attempting to confirm warranty with Zurich for days with no success, I had no issue calling Zurich to confirm warranty would cover it. They said parts were unavailable in US, some in Korea, no guarantee where they would be distributed to and could not be ordered yet, so timeline of at least a month that I would be without a car. They could not offer me a loaner or rental. Last night I received Recall notice SC276 for the exact issue I am dealing with. In 4 calls to Lehighton Kia this recall was never mentioned. …
My 2017 Kia Niro has developed a serious hybrid system failure that causes the vehicle to shut off unexpectedly while driving. For about a month, the car would only start using the "12V Battery Reset" button. Now it starts, but after driving a short distance, the vehicle loses power and shuts off without warning. The only way to restart it is by pressing the reset button again. The AC and accessories continue to run, and the high voltage battery appears to charge normally, but the car cannot maintain 12V power under load. This is consistent with a DC DC converter or 12V subsystem failure, which is a known issue in early Kia Niro hybrids. This sudden shutdown creates a dangerous situation, especially in traffic. I am reporting this as a safety defect due to the unexpected loss of motive power. There is no recall for this issue, but many owners have reported similar failures.
I called my local Dealer Nationwide Kia in Timonium Maryland to get an appointment for the required recall. They have so far have been unresponsive, so I called Kia in California. I got a case # of [redacted] after waiting 1:30 mins on the phone. Called back the next week and they said they called the dealer and got no answer but left a message and they sent an email. Called back the next week and they said the dealer never responded and they sent another email. Called back today and sat on the phone with Kia California for another hour and they never answered. I'm very upset that i can't seem to get an appointment for a safety recall, what good does a recall do if the dealer won't answer me and the Kia Zone office can't force them into action.
Electrical complaints in other Niro years
Frequently asked questions
How common are electrical problems on the 2017 Kia Niro?
NHTSA has 23 complaints about the electrical system of the 2017 Kia Niro, 28% of the model year's 82 complaints. The component named most often is 12v/24v/48v battery (2 mentions).
Is there a recall for 2017 Kia Niro electrical problems?
No. NHTSA lists no electrical system recall for the 2017 Kia Niro, though it has 4 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 2017 Kia Niro electrical problems start?
Half of the complaints with a recorded mileage happened before about 12,000 miles, and 67% before 25,000 miles.
Is it dangerous?
Owners linked 0 crashes, 4 fires 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.