2019-2025 Kia Niro EV Problems: 10 Known Issues

On 2020 Niro EV vehicles built roughly June 18 to September 4, 2020, the EPCU assembly (which houses the inverter, LDC and on-board charger electronics) was produced by the supplier with improper sealing. Coolant can migrate internally into the EPCU housing and contact the circuit board, shorting the power electronics. Kia's Part 573 report cites warranty claims of stall / loss of power with the EPCU replaced for internal coolant leakage. NHTSA campaign 22V-899 (Kia SC258) covers 872 vehicles; the supplier corrected the sealing process on July 6, 2020, and units built from September 5, 2020 onward are confirmed properly sealed.

On 2022 Niro EV vehicles built July 21 through December 2, 2021, a supplier deviation in the female-to-female terminal of the high-voltage battery service/safety plug lets the contact surfaces develop abnormally high electrical resistance. Under the current flow of driving or high-voltage charging the plug heats up and can melt, causing loss of motive power and creating a fire risk. NHTSA campaign 24V-358 (Kia SC314) covers approximately 2,209 vehicles. Kia specifically instructed owners not to charge in a garage or other covered structure until the repair was performed.

Second-generation 2023+ Niro EV integrates the on-board charger and the DC-DC converter into a single Integrated Charging Control Unit. Kia TSB ELE298 (September 2023) documents 2023 MY Niro EV (SG2 EV) vehicles built January 4, 2022 through March 29, 2023 that charge poorly or not at all on a Level 1 or Level 2 AC charger while DC fast charging still works normally - the signature of a failed AC-side ICCU stage. Because the same unit contains the DC-DC converter that keeps the 12V auxiliary battery topped up, a degraded ICCU also produces repeat 12V battery failures and, in the worst case, progressive reduction of motive power as the 12V system browns out. Note: the Niro EV is not on the E-GMP platform, so it is NOT covered by the Hyundai/Kia E-GMP ICCU recalls issued for the EV6, Ioniq 5 and GV60 - on the Niro EV this is handled as a TSB and warranty repair, not a safety recall.

A persistent, widely reported complaint across first-generation (DE) 2019-2022 Niro EV vehicles: the 12V auxiliary battery discharges while the car sits, sometimes within days, leaving the vehicle unresponsive - no key-fob recognition, no push-button start, no dash. Owners report it happening even while the car is plugged in and charging on 120V or 240V, because the DC-DC top-up of the 12V battery only runs on a schedule rather than continuously. Contributing causes documented by owners and dealers include modules that fail to sleep, parasitic draw from door-latch and body electronics, and an undersized/short-lived AGM aux battery. Kia's rear-door-latch parasitic-draw TSB (ELE163, NHTSA document MC-10160618-0001) covers the Niro Plug-in Hybrid, Optima Plug-in Hybrid and Soul EV, not the Niro EV.

First-generation (DE) 2019-2022 Niro EV owners consistently report DC fast-charge rates collapsing well below the car's ~77-85 kW peak when the pack is cold. Owners document sessions settling in the 20-50 kW range at ambient temperatures near freezing even on 150 kW and 350 kW stations, roughly doubling road-trip charging stops in winter. The root cause is architectural rather than a component defect: the DE Niro EV has no navigation-triggered pack preheat, and only cars with the optional battery heater (cold weather package) offer a driver-selectable Winter Mode, so on most cars the BMS simply derates charge current to protect a cold pack. Owners also report the achievable rate tapering hard above roughly 50-80% state of charge, and some report charge rates that appear to decline session-over-session as the pack ages. Note: the second-generation SG2 car and the E-GMP siblings behave differently - do not assume the same behavior across the range.

On 2023 Niro EV vehicles (and 2024 EV9), the differential gear bolts inside the Gear Drive Unit were not torqued properly by the differential supplier. Over time the bolts back out, damage the GDU housing and the reduction gear, and can ultimately cause the differential to seize or the vehicle to lose motive power while driving. Kia's chronology cites two global customer complaints of drive-unit noise; differential lockup and loss of motive power were identified as potential consequences through testing, with no U.S. incidents. The recall is NHTSA campaign 24V-271 (Kia SC308).

Second-generation (SG2) 2023-2024 Niro EV vehicles, along with the 2023 EV6, received a drive shaft that was improperly heat-treated at the supplier. The insufficient case hardening leaves the shaft vulnerable to fatigue fracture under normal torque loading; because an EV applies full motor torque from zero rpm, the shaft can break in service and the vehicle immediately loses drive to that wheel. NHTSA campaign 24V-057 (Kia SC295) covers the affected build population.

On 2023-2025 Niro EV vehicles (and the hybrid and PHEV variants), variation in the routing of the floor wiring assembly beneath the manual front passenger seat lets repeated fore-aft seat adjustment chafe and cut one or more wires. Damaged wiring can prevent the front airbags and seat belt pretensioners from deploying in a crash, and can also cause an unintended side airbag deployment. NHTSA campaign 25V-024 covers 80,255 Niro vehicles in total, of which 21,909 are Niro EVs.

On 2020-2022 Niro EV vehicles equipped with the 10.25-inch touchscreen, voltage surges in the rearview camera power circuit progressively damage the camera's circuit board until the camera stops sending an image. With no rearview image on reverse the vehicle fails to comply with FMVSS 111 (Rear Visibility), increasing back-over risk. NHTSA campaign 25V-426 (Kia SC342) covers 11,327 Niro EVs.

Kia service campaign SC321 covers 2019-2022 Niro EV vehicles produced December 5, 2018 through April 12, 2022 that were originally sold or are currently registered in one of 28 heavy road-salt states. Saltwater enters the Integrated Electronic Brake unit through the IEB fastening bolt hole; over time the intrusion corrodes the assembly and can render the IEB motor inoperative. When that happens the electric brake boost is lost - the brakes still function hydraulically but pedal effort rises sharply and stopping distances extend, with ABS and Forward Collision-Avoidance Assist warning lights illuminating. Transport Canada issued the same action as recall 2025003. Note this is the EV-specific IEB unit, distinct from the conventional vacuum-boost brake system used on the Niro hybrid.