Thinking about buying a used Hyundai Kauai (2017–2023) in New Zealand? We've documented 16 known faults for this model spanning electrical, engine, cooling, and transmission. Each researched and verified before it's published. The most serious issues here are rated critical. Two are set out in full below — the rest, with the symptoms, repair costs and checks for each, are free with an account.
16
Documented faults
Critical
Most serious
$400–$2,800
Typical repair
5
Systems covered
Known Hyundai Kauai faults
Every fault below is documented specifically for this model — researched and verified before it’s published.
01Lithium-Ion Battery Thermal Runaway and Fire Risk
CriticalRareElectrical $0–$22,000 to fix
Manufacturing defects in LG Energy Solutions-supplied battery cells caused internal short circuits capable of triggering thermal runaway and vehicle fire, even while parked or charging unattended. Hyundai issued a worldwide recall (NHTSA 20V-226) covering approximately 77,000 Kona Electric vehicles globally, with full battery pack replacement as the primary remedy. Post-recall vehicles also received a Battery Management System (BMS) software update capping state of charge to reduce residual risk, though replacement packs from the same supplier were also later scrutinised.
Symptoms to notice
Vehicle catches fire while parked or during charging without prior warning
Battery management system warning lights illuminate on instrument cluster
Sudden unexplained loss of charge capacity or range
Unusual heat felt through cabin floor or from charging port area
Charging session terminates unexpectedly mid-cycle with fault code
What to check
Verify recall completion status via Hyundai dealer VIN lookup before purchase; confirm BMS software version is updated; inspect underfloor battery pack seams and cooling lines for any signs of discolouration, swelling, or heat damage; check whether the vehicle has received the full battery pack replacement or only the software update.
Where to look: Underfloor high-voltage lithium-ion battery pack (64kWh, beneath cabin floor)
Ask the seller
“Has this vehicle had the battery fire recall completed at a Hyundai dealer, and can you provide the recall completion certificate?”
“Did the vehicle receive a full battery pack replacement or only the BMS software update?”
“Has the vehicle ever shown battery warning lights or had a charging incident?”
0212V Auxiliary Battery Premature Failure — Vehicle Fails to Power On
MajorCommonElectrical $250–$650 to fix
The Kona Electric's 12V lead-acid auxiliary battery is charged by a DC-DC converter from the high-voltage pack rather than a conventional alternator, resulting in an atypical charge profile that causes premature cell failure — commonly within 2–4 years rather than the expected 4–6 years. Failure of the 12V battery prevents the vehicle control system from powering on and the high-voltage contactor from closing, leaving the car completely inoperative despite a fully charged HV pack. This is a common stranding fault and caught many early owners off guard.
Symptoms to notice
Vehicle will not power on despite high-voltage battery showing charge
Relay clicking sounds when pressing start but no system activation
Random electrical warnings or screen flickering before complete failure
Vehicle requires jump-start from 12V terminals to power on
Low 12V battery warning displayed on instrument cluster
What to check
Watch for: Vehicle will not power on despite high-voltage battery showing charge. If a workshop inspection is possible: Measure 12V battery resting voltage (must be 12.4–12.8V); check the date stamp on the battery case; scan DC-DC converter output voltage via OBD; inspect frunk or engine bay battery terminals for corrosion.
Where to look: 12V auxiliary battery located in front luggage compartment (frunk) on earlier models or engine bay on later variants
Ask the seller
“When was the 12V auxiliary battery last replaced, and can you show a receipt?”
“Has the car ever failed to power on or required a jump-start?”
“Has the DC-DC converter been tested for correct output voltage at a Hyundai dealer?”
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14 more documented faults on the Hyundai Kauai
Symptoms, what to check, where to look and what to ask the seller — for every fault above. Free with an account, no card needed. One account covers one vehicle, so make it the car you’re actually looking at.
This page covers the model. Enter the plate of the actual car you’re looking at and see its year, engine, safety rating and register flags — free, no account needed.
Like any used car, it depends on the specific example and its service history. Across the 16 documented faults for the Hyundai Kauai, the recurring problem areas are electrical, engine, and cooling. A Hyundai Kauai with a full service history and no signs of the issues listed on this page can be a sound buy but each one needs to be checked individually before you commit.
What are the most common problems with a used Hyundai Kauai?
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We've catalogued 16 known faults for the Hyundai Kauai, covering electrical, engine, and cooling. Two are written out in full on this page. The rest — with the symptoms to notice, what to inspect, and typical repair costs for each — are free once you create an account.
How much do repairs cost on a Hyundai Kauai?
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Most single repairs on the Hyundai Kauai fall between $400–$2,800 at NZ independent-workshop rates. Some of the 16 documented faults cost less and a few cost considerably more, and no one car needs them all. Knowing which ones to look for before you view is what lets you negotiate the price down or walk away.
Should I get a pre-purchase inspection on a Hyundai Kauai?
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Yes. A Hyundai Kauai inspection focused on its known weak points is the single best way to avoid an expensive mistake. KickTyres gives you a guided, model-specific inspection plus a market valuation and negotiation figure for $17.90 far less than the cost of missing one of the faults on this page.