MajorCommonCooling

Hyundai Ioniq 5: Heat pump refrigerant line fitting corrosion causing heating system failure

Heat pump refrigerant line fitting corrosion causing heating system failure is a common cooling fault on the Hyundai Ioniq 5 on the 2021 onward cars, and we rate it major. Putting it right costs $900 to $2,800 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 12 documented faults on the Hyundai Ioniq 5.

Vehicle: Hyundai Ioniq 5
Years: 2021 onward
Fuel: ev
Gearbox: auto
System: Cooling

This page covers the Hyundai Ioniq 5 as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Hyundai Ioniq 5 faults12 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph of the Body corrosion yet. We would rather show none than show a picture of a different part.

What goes wrong

The Ioniq 5 NE shares the e-GMP platform heat pump system with the Kia EV6, and the same galvanic corrosion issue affects the aluminium refrigerant line fittings where they connect to dissimilar metal components. Refrigerant leaks progressively degrade heat pump output, with complete failure in winter leaving only energy-intensive resistive heating. Hyundai issued a TSB addressing refrigerant line inspection and replacement in AU markets. The issue was documented within 2–4 years of service on NZ/AU examples.

What you would notice

Insufficient cabin heating in cold weather
Heat pump error message or warning light
Battery range significantly reduced in winter (resistive heating compensating)
Refrigerant loss indicated by system warning

How to check it

Where to look. Heat pump refrigerant lines at front of vehicle near HVAC module

Test heat pump operation on a cold day.
Verify the heater produces warm air quickly (heat pump is efficient and fast).
Request inspection of refrigerant line fittings for corrosion.
Check service records for TSB completion.

Parts involved: Body corrosion.

What it costs to put right

$900 to $2,800 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

“Has the heat pump refrigerant line TSB been completed by a Hyundai dealer?”
“Any reduction in heating performance in winter?”
“Has the refrigerant system been re-gassed?”

Now check the Hyundai Ioniq 5 you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.

Hyundai Ioniq 5 buyer questions

Is heat pump refrigerant line fitting corrosion causing heating system failure serious on a Hyundai Ioniq 5?

We rate it major and common on the Hyundai Ioniq 5. The Ioniq 5 NE shares the e-GMP platform heat pump system with the Kia EV6, and the same galvanic corrosion issue affects the aluminium refrigerant line fittings where they connect to dissimilar metal components. Refrigerant leaks progressively degrade heat pump output, with complete failure in winter leaving only energy-intensive resistive heating. Hyundai issued a TSB addressing refrigerant line inspection and replacement in AU markets. The issue was documented within 2–4 years of service on NZ/AU examples.

How much does it cost to fix on a Hyundai Ioniq 5?

$900 to $2,800 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which Hyundai Ioniq 5 years are affected?

Our research records this fault on the 2021 onward Hyundai Ioniq 5. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.

How do I check for it before I buy?

Test heat pump operation on a cold day. Verify the heater produces warm air quickly (heat pump is efficient and fast). Request inspection of refrigerant line fittings for corrosion. Check service records for TSB completion. Look here: Heat pump refrigerant lines at front of vehicle near HVAC module