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2019-2025 Kia Niro EV Problems: 10 Known Issues

2019-2025 model years · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated August 2026

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Issue summary

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2019-2025 Kia Niro EV has 10 documented known issues, with 7 rated critical. The most serious are Gear Drive Unit differential bolts loosen, damaging the reduction gear and locking the differential ($0-$6,000 repair), High-voltage battery safety plug develops high resistance, overheats and melts (fire and power-loss risk) ($0-$900 repair), Electric Power Control Unit (EPCU) internal coolant leak causes sudden stall and loss of drive power ($0-$4,500 repair), Floor wiring under the front passenger seat chafes through, disabling front airbags and seat belt pretensioners ($0-$800 repair), Integrated Electronic Brake (IEB) unit corrodes from road-salt water ingress, causing loss of brake boost ($0-$3,500 repair), ICCU (Integrated Charging Control Unit) failure - AC charging stops or never starts, and the 12V battery stops charging ($0-$2,800 repair) and Improperly heat-treated drive shaft fractures under load causing loss of drive power ($0-$1,200 repair). Across all issues with published estimates, repair costs range from $200 to $6,000. DIY maintenance guides at au7o.io.

In This Article

  • Niro EV Electrical5
  • Niro EV Drivetrain2
  • Niro EV Safety/Recalls2
  • Niro EV Brakes1
  • Recalls5
  • FAQ
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In This Article

  • Electrical5
  • Drivetrain2
  • Safety/Recalls2
  • Brakes1
  • Recalls5
  • FAQ

All 10 Known Issues

NHTSA Recalls5 recalls

ELECTRICAL SYSTEM:PROPULSION SYSTEM:SHOCK PROTECTION

Kia America, Inc. (Kia) is recalling certain 2022 Niro EV vehicles. The high voltage battery safety plug may overheat and melt, which can cause a loss of drive power or fire.

Campaign #24V35800021/05/2024

BACK OVER PREVENTION: SENSING SYSTEM: CAMERA

Kia America, Inc. (Kia) is recalling certain 2020-2022 Niro EV vehicles. The circuit board for the rearview camera may become damaged and cause the rearview camera image not to display. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 111, "Rear Visibility."

Campaign #25V42600020/06/2025

POWER TRAIN:DRIVELINE:DRIVESHAFT

Kia America, Inc. (Kia) is recalling certain 2023-2024 Niro EV and 2023 EV6 vehicles. One of the drive shafts may have been improperly heat-treated, allowing it to break under load and resulting in a loss of drive power.

Campaign #24V05700031/01/2024
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Frequently Asked Questions

What are the most common Kia Niro EV problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2019-2025 Kia Niro EV has 10 documented issues. The most frequently reported are: Gear Drive Unit differential bolts loosen, damaging the reduction gear and locking the differential, High-voltage battery safety plug develops high resistance, overheats and melts (fire and power-loss risk), Electric Power Control Unit (EPCU) internal coolant leak causes sudden stall and loss of drive power. Of these, 7 are rated critical and should be addressed promptly.

Is the Kia Niro EV reliable?

The 2019-2025 Kia Niro EV has 10 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 7 issues are rated critical: Gear Drive Unit differential bolts loosen, damaging the reduction gear and locking the differential and High-voltage battery safety plug develops high resistance, overheats and melts (fire and power-loss risk) and Electric Power Control Unit (EPCU) internal coolant leak causes sudden stall and loss of drive power and Floor wiring under the front passenger seat chafes through, disabling front airbags and seat belt pretensioners and Integrated Electronic Brake (IEB) unit corrodes from road-salt water ingress, causing loss of brake boost and ICCU (Integrated Charging Control Unit) failure - AC charging stops or never starts, and the 12V battery stops charging and Improperly heat-treated drive shaft fractures under load causing loss of drive power. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Kia Niro EV problems?

Repair costs for known Kia Niro EV issues range from $0 to $6,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Gear Drive Unit differential bolts loosen, damaging the reduction gear and locking the differential, typically costs $0-$6,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What year Kia Niro EV is the most reliable?

Reliability varies across model years of the Kia Niro EV. Based on documented issues, problems are most commonly reported in earlier model years. Au7o recommends checking the specific known issues for your target year before purchasing, and having a pre-purchase inspection performed by a qualified mechanic. Our known issues database covers the 2019-2025 Kia Niro EV with 10 documented issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports.

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.

Data compiled from NHTSA recalls, manufacturer TSBs, automotive forums, and AI-assisted research. No aggregated owner-report counts available for this vehicle yet.

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ALL YEARS2025202420232022202120202019

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.

Common Symptoms

  • Burning or melted-plastic smell from under the vehicle
  • Charging session aborts or faults
  • Loss of motive power while driving
  • High-voltage system warning message
  • Heat damage or discoloration at the battery service plug

How to Fix

Free recall remedy under NHTSA 24V-358 / Kia SC314: the dealer replaces the high-voltage battery safety plug with a revised unit that uses a solid bus-bar connection instead of the deviated F-F terminal. Until the repair is done, charge outdoors and away from structures. Owner notification letters were mailed July 19, 2024.

Typical repair cost:$0 - $900

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Community Reported
High ConfidenceVerifiedReviewed Aug 2026

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.

Common Symptoms

  • Vehicle stalls or shuts down while driving
  • Sudden loss of drive power
  • Check electric vehicle system warning
  • Turtle / reduced power indicator
  • Coolant loss with no external leak

How to Fix

Free recall remedy under NHTSA 22V-899 / Kia SC258: the dealer inspects the EPCU for internal coolant leakage and, if leakage is found, replaces it with an improved-sealing unit at no charge. Verify by VIN at nhtsa.gov/recalls or with a Kia dealer, since only a narrow build window is included. Outside the recall population an EPCU replacement is a high-cost repair typically covered by the 10yr/100k EV system warranty.

Typical repair cost:$0 - $4,500

Research This Issue

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Community Reported
High ConfidenceVerifiedReviewed Aug 2026

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.

Common Symptoms

  • "Check electric vehicle system" warning message
  • "Stop vehicle and check power supply" message
  • Level 1 / Level 2 charging fails or stops early while DC fast charging still works
  • Repeat dead 12V battery after replacement
  • Loud buzzing or clicking from the front of the car when plugged in
  • Progressive reduction in available drive power

How to Fix

Have the dealer run the diagnostic in TSB ELE298: read the ICCU DTCs and, if the listed codes are present, replace the ICCU assembly under the EV system warranty (10 years / 100,000 miles in the US). Replacing only the 12V battery does not fix it - if a new 12V battery drains again within weeks, the ICCU DC-DC stage is the suspect. Out of warranty the ICCU assembly alone runs roughly $1,200-$2,500 plus labor.

Find a nearby Kia dealer in Google Maps ↗

Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.

Typical repair cost:$0 - $2,800

Research This Issue

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Community Reported
High ConfidenceVerifiedReviewed Aug 2026

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. A Kia TSB (NHTSA document MC-10160618-0001) addresses rear door latches imposing a parasitic drain on the 12V battery with the vehicle off.

Common Symptoms

  • Car completely dead, no response to key fob
  • Push-button start does nothing
  • Mirrors fold/unfold sluggishly then nothing
  • 12V battery goes flat after only a few days parked
  • 12V battery dies even while plugged in and charging
  • Repeated jump-starts required

How to Fix

There is no safety recall for this. Practical fixes owners and dealers use: have the dealer perform a documented parasitic-draw test and apply the door-latch TSB if applicable; replace the original 12V AGM with a higher-capacity AGM or lithium replacement; use the vehicle's 12V reset button (or a jump pack) to wake the car; and use Utility Mode / a scheduled drive or charge session to force periodic DC-DC top-up if the car sits for long periods. A trickle charger on the 12V terminals is the reliable answer for long-term storage. If the 12V goes flat repeatedly after replacement, have the LDC/DC-DC converter output tested.

Typical repair cost:$200 - $600

Research This Issue

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Community Reported
Medium ConfidenceVerifiedReviewed Aug 2026

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 driver-selectable battery preconditioning and no navigation-triggered pack preheat, so 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.

Common Symptoms

  • DC fast charging limited to 20-50 kW in cold weather
  • Charge rate far below the station's rated output
  • Charging time noticeably longer than when the car was new
  • Charge rate drops sharply above 50-80% state of charge
  • Much longer winter road-trip charging stops

How to Fix

There is no recall or software fix for the first-generation car's lack of preconditioning. Practical mitigation: drive at highway speed for 20-30 minutes immediately before a DC session so the pack self-heats, avoid charging straight from a cold overnight park, plan winter stops at 10-70% state of charge where the curve is at its best, and accept a longer stop rather than chasing a higher-power station that the car cannot use. If DC rates are poor even on a warm pack at low state of charge, have the dealer check the BMS for cell imbalance and log a state-of-health test - persistent low charge acceptance can be a warrantable battery condition under the 10yr/100k EV warranty.

Find a nearby Kia dealer in Google Maps ↗

Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.

Typical repair cost:$0 - $0

Research This Issue

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Community Reported
Medium ConfidenceVerifiedReviewed Aug 2026

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 confirmed field cases of differential lockup and loss of motive power. NHTSA campaign 24V-271 (Kia SC308).

Common Symptoms

  • Whining, grinding or rattling from the drive unit
  • Metallic noise that changes with vehicle speed
  • Sudden loss of motive power
  • Differential lockup / wheels bind
  • Gear oil leak from the GDU housing

How to Fix

Free recall remedy under NHTSA 24V-271 / Kia SC308: the dealer replaces the entire gear drive unit at no charge. Owner notification letters were mailed May 17, 2024. Because the failure mode is progressive, a whining or grinding noise from the drive unit on an affected VIN should be treated as urgent - do not wait for the notification letter.

Typical repair cost:$0 - $6,000

Research This Issue

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Community Reported
Medium ConfidenceVerifiedReviewed Aug 2026

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.

Common Symptoms

  • Loud clunk or bang followed by no drive
  • Loss of drive power while accelerating
  • Vehicle free-rolls with no propulsion
  • Grinding or knocking from the front axle
  • Vibration under acceleration before failure

How to Fix

Free recall remedy under NHTSA 24V-057 / Kia SC295: the dealer inspects and replaces the affected drive shaft at no charge. Owner notification letters were mailed March 29, 2024. If the shaft has already fractured, the vehicle should not be driven; have it towed. Out-of-recall drive shaft replacement typically runs several hundred to about a thousand dollars in parts and labor.

Typical repair cost:$0 - $1,200

Research This Issue

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Community Reported
High ConfidenceVerifiedReviewed Aug 2026

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.

Common Symptoms

  • Airbag / SRS warning light illuminated
  • Passenger occupant-detection light behaves erratically
  • Seat belt pretensioner fault message
  • Unintended side airbag deployment
  • Fault appears after moving the passenger seat

How to Fix

Free recall remedy under NHTSA 25V-024: the dealer inspects the floor wiring assembly under the manual front passenger seat, replaces it if damaged, reroutes it, and installs additional protective covering to prevent recurrence. Owner notification letters were mailed in March 2025. An illuminated airbag warning light on an affected VIN should be treated as urgent.

Typical repair cost:$0 - $800

Research This Issue

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Community Reported
High ConfidenceVerifiedReviewed Aug 2026

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.

Common Symptoms

  • Black screen when shifting into reverse
  • Rearview camera image flickers, freezes or shows lines
  • Camera image intermittently missing then returns
  • Guidelines display without a video image

How to Fix

Free recall remedy under NHTSA 25V-426 / Kia SC342: the dealer replaces the rearview camera at no charge. Owner notification letters were mailed November 7, 2025, and Kia will reimburse owners who already paid for this repair under its General Reimbursement Plan - keep the receipt and submit it.

Typical repair cost:$0 - $700

Research This Issue

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Community Reported
High ConfidenceVerifiedReviewed Aug 2026

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.

Common Symptoms

  • ABS warning light on
  • Forward Collision-Avoidance Assist (FCA) warning light on
  • Brake pedal noticeably harder / firmer than normal
  • Longer stopping distances
  • Loss of regenerative brake blending
  • Brake system warning message on the cluster

How to Fix

Free remedy under Kia service campaign SC321 (Transport Canada recall 2025003): the dealer inspects the IEB and either applies silicone sealant to the IEB fastening bolt hole to block further water intrusion, or replaces the IEB assembly if corrosion has already occurred. Because this is a service campaign rather than a US NHTSA safety recall, it may not show up in a VIN lookup on nhtsa.gov - ask a Kia dealer to check for open campaigns by VIN. An out-of-pocket IEB replacement is expensive, commonly $2,000-$3,500.

Typical repair cost:$0 - $3,500

Research This Issue

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Community Reported
High ConfidenceVerifiedReviewed Aug 2026

SEATS

Kia America, Inc. (Kia) is recalling certain 2023-2025 Niro EV, Plug-in Hybrid (PHEV), and Hybrid vehicles. The floor wiring assembly beneath the front passenger seat may become damaged, which can prevent the front air bags and seat belts from deploying properly or cause an unintended side curtain air bag deployment.

Campaign #25V02400017/01/2025

POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT

Kia America, Inc. (Kia) is recalling certain 2023 Niro EV and 2024 EV9 vehicles. The differential gear bolts in the gear drive unit may not be tightened properly, which can result in a loss of drive power or cause the differential to lock up.

Campaign #24V27100016/04/2024

Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.

get a full repair guide

What is the 2023 Kia Niro EV Gear Drive Unit differential bolts loosen, damaging the reduction gear and locking the differential?

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… Repairs typically run $0-$6,000. Severity: high.

What is the 2022 Kia Niro EV High-voltage battery safety plug develops high resistance, overheats and melts (fire and power-loss risk)?

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 hig… Repairs typically run $0-$900. Severity: high.

What is the 2020 Kia Niro EV Electric Power Control Unit (EPCU) internal coolant leak causes sudden stall and loss of drive power?

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 circui… Repairs typically run $0-$4,500. Severity: high.

What is the 2023-2025 Kia Niro EV Floor wiring under the front passenger seat chafes through, disabling front airbags and seat belt pretensioners?

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… Repairs typically run $0-$800. Severity: high.

What is the 2019-2022 Kia Niro EV Integrated Electronic Brake (IEB) unit corrodes from road-salt water ingress, causing loss of brake boost?

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… Repairs typically run $0-$3,500. Severity: high.

What is the 2023-2025 Kia Niro EV ICCU (Integrated Charging Control Unit) failure - AC charging stops or never starts, and the 12V battery stops charging?

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 n… Repairs typically run $0-$2,800. Severity: high.

What is the 2023-2024 Kia Niro EV Improperly heat-treated drive shaft fractures under load causing loss of drive power?

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… Repairs typically run $0-$1,200. Severity: high.

What is the 2020-2022 Kia Niro EV Rearview camera circuit board damaged by voltage surges - reversing image fails to display?

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… Repairs typically run $0-$700. Severity: medium.

What is the 2019-2022 Kia Niro EV 12V auxiliary battery goes flat while parked, leaving the car completely dead and unable to power up?

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… Repairs typically run $200-$600. Severity: medium.

What is the 2019-2022 Kia Niro EV Severe DC fast-charge derating in cold weather - no driver-selectable battery preconditioning on the first-generation car?

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 st… Repairs typically run $0-$0. Severity: low.