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Kia · Known Issues

2023 Kia Niro EV Problems: 4 Known Issues

2023 model year · 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 2023 Kia Niro EV has 4 documented known issues, with 4 rated critical. The most serious are Gear Drive Unit differential bolts loosen, damaging the reduction gear and locking the differential ($0-$6,000 repair), Floor wiring under the front passenger seat chafes through, disabling front airbags and seat belt pretensioners ($0-$800 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). DIY maintenance guides at au7o.io.

In This Article

  • Niro EV Drivetrain2
  • Niro EV Safety/Recalls1
  • Niro EV Electrical1
  • Recalls3
  • FAQ
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In This Article

  • Drivetrain2
  • Safety/Recalls1
  • Electrical1
  • Recalls3
  • FAQ

All 4 Known Issues

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ALL YEARS2025202420232022202120202019

On the 2023 Kia Niro EV 150 kW permanent-magnet synchronous motor / 64.8 kWh (SG2 EV), 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

On the 2023-2024 Kia Niro EV 150 kW permanent-magnet synchronous motor / 64.8 kWh (SG2 EV), 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

GoogleRedditYouTubeNHTSA
Community Reported
High ConfidenceVerifiedReviewed Aug 2026

On the 2023-2025 Kia Niro EV 150 kW permanent-magnet synchronous motor / 64.8 kWh (SG2 EV), 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 the 2023-2025 Kia Niro EV 150 kW permanent-magnet synchronous motor / 64.8 kWh (SG2 EV), 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.

Typical repair cost:$0 - $2,800

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
High ConfidenceVerifiedReviewed Aug 2026
NHTSA Recalls3 recalls

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: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

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

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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 2023 Kia Niro EV has 4 documented issues. The most frequently reported are: Gear Drive Unit differential bolts loosen, damaging the reduction gear and locking the differential, Floor wiring under the front passenger seat chafes through, disabling front airbags and seat belt pretensioners, ICCU (Integrated Charging Control Unit) failure - AC charging stops or never starts, and the 12V battery stops charging. Of these, 4 are rated critical and should be addressed promptly.

Is the Kia Niro EV reliable?

The 2023 Kia Niro EV has 4 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 4 issues are rated critical: Gear Drive Unit differential bolts loosen, damaging the reduction gear and locking the differential and Floor wiring under the front passenger seat chafes through, disabling front airbags and seat belt pretensioners 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 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.

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.

NHTSA.gov

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 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.