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2021 Kia Niro EV Problems: 4 Known Issues

2021 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 2021 Kia Niro EV has 4 documented known issues, with 1 rated critical. The most serious is Integrated Electronic Brake (IEB) unit corrodes from road-salt water ingress, causing loss of brake boost ($0-$3,500 repair). Across all issues with published estimates, repair costs range from $200 to $3,500. DIY maintenance guides at au7o.io.

In This Article

  • Niro EV Brakes1
  • Niro EV Electrical2
  • Niro EV Safety/Recalls1
  • Recalls3
  • FAQ
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In This Article

  • Brakes1
  • Electrical2
  • Safety/Recalls1
  • Recalls3
  • FAQ

All 4 Known Issues

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ALL YEARS2025202420232022202120202019

On the 2019-2022 Kia Niro EV 150 kW permanent-magnet synchronous motor / 64 kWh (DE EV), 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.

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Typical repair cost:$0 - $3,500

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Community Reported
High ConfidenceVerifiedReviewed Aug 2026

On the 2019-2022 Kia Niro EV 150 kW permanent-magnet synchronous motor / 64 kWh (DE EV), 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

On the 2019-2022 Kia Niro EV 150 kW permanent-magnet synchronous motor / 64 kWh (DE 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 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.

Typical repair cost:$0 - $0

Research This Issue

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Community Reported
Medium ConfidenceVerifiedReviewed Aug 2026

On the 2020-2022 Kia Niro EV 150 kW permanent-magnet synchronous motor / 64 kWh (DE EV), 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
NHTSA Recalls3 recalls

ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY:THERMAL MANAGEMENT:FLUID/COOLANT

Kia America, Inc. (Kia) is recalling certain 2020 Niro EV vehicles. The Electric Power Control Unit (EPCU) may have been improperly sealed and may leak coolant internally.

Campaign #22V89900006/12/2022

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

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

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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 2021 Kia Niro EV has 4 documented issues. The most frequently reported are: Integrated Electronic Brake (IEB) unit corrodes from road-salt water ingress, causing loss of brake boost, Rearview camera circuit board damaged by voltage surges - reversing image fails to display, 12V auxiliary battery goes flat while parked, leaving the car completely dead and unable to power up. Of these, 1 is rated critical and should be addressed promptly.

Is the Kia Niro EV reliable?

The 2021 Kia Niro EV has 4 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 1 issue is rated critical: Integrated Electronic Brake (IEB) unit corrodes from road-salt water ingress, causing loss of brake boost. 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 $3,500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Integrated Electronic Brake (IEB) unit corrodes from road-salt water ingress, causing loss of brake boost, typically costs $0-$3,500 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

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

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

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.