Thinking about buying a used Hyundai Ioniq (2016–2022) in New Zealand? We've documented 9 known faults for this model spanning electrical, transmission, engine, and suspension. 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.
9
Documented faults
Critical
Most serious
$1,500–$3,800
Typical repair
4
Systems covered
Known Hyundai Ioniq faults
Every fault below is documented specifically for this model — researched and verified before it’s published.
The fully electric Ioniq shares battery-management technology with the Kona Electric, which was subject to a major global recall for a rare fire risk from LG-supplied cells and needed battery-management (BMS) software updates. Only a small number of Ioniq Electric were named in the fire recall, but any imported EV should have had the BMS updates applied and its battery health checked. An out-of-warranty high-voltage battery is extremely expensive, so state of health matters more than anything else on this car.
Symptoms to notice
Reduced range compared to when new
Charging slower or stopping early
Battery or 'check EV system' warning lights
Charge limited to 80-90% by dealer software
What to check
Ask for a battery state-of-health (SOH) readout, ideally from a Hyundai dealer or an EV specialist. Confirm any BMS/battery software campaigns were completed. Compare the real-world range the owner sees against the original rating. On imports, ask what recall work was done overseas.
Where to look: High-voltage battery under the floor; BMS module
Ask the seller
“Do you have a recent battery state-of-health figure?”
“Were the battery/BMS software recalls done?”
“What real range do you get on a full charge?”
0212V auxiliary battery goes flat and leaves the car dead
MajorCommonElectrical $250–$600 to fix
The Ioniq's small 12V battery powers the door locks, computers and the relays that 'boot up' the hybrid/EV system, and it drains flat far more often than a normal car. Owners report walking out to a car that won't unlock or wake up, sometimes only days after it was driven, because control modules stay awake or the DC-DC converter isn't topping the 12V up properly. It strands you but is rarely expensive if the battery itself is still good. On the electric Ioniq this can be an early sign of the same charging-unit family of faults that plague the newer EVs.
Symptoms to notice
Car completely dead, won't unlock or start
Needs a jump-start after sitting a few days
Warning about 12V battery on the dash
Electronics reset or clock lost
What to check
Ask if it has ever been jump-started or left the owner stranded. Check the 12V battery date sticker and whether it is the original. Try locking/unlocking with the key fob and confirm the car wakes instantly. If it hesitates or the dash flickers on start-up, be cautious.
Where to look: 12V battery (boot on EV, engine bay on hybrid); DC-DC converter
Ask the seller
“Has this car ever failed to start or needed a jump?”
“Has the 12V battery been replaced, and when?”
“Does it get driven regularly or sit for long periods?”
ElectricalCritical
ElectricalMajor
TransmissionMajor
ElectricalMajor
TransmissionMajor
EngineMajor
SuspensionMajor
7 more documented faults on the Hyundai Ioniq
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 9 documented faults for the Hyundai Ioniq, the recurring problem areas are electrical, transmission, and engine. A Hyundai Ioniq 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 Ioniq?
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We've catalogued 9 known faults for the Hyundai Ioniq, covering electrical, transmission, and engine. 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 Ioniq?
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Most single repairs on the Hyundai Ioniq fall between $1,500–$3,800 at NZ independent-workshop rates. Some of the 9 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 Ioniq?
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Yes. A Hyundai Ioniq 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.