CriticalCommonElectrical

Hyundai Ioniq 5: ICCU failure: 12V battery stops charging, loss of drive power (NE Ioniq 5, E-GMP, recalls REC-005942 and REC-006224)

ICCU failure: 12V battery stops charging, loss of drive power (NE Ioniq 5, E-GMP, recalls REC-005942 and REC-006224) is a common electrical fault on the Hyundai Ioniq 5 on the 2021–2024 cars, and we rate it critical. Putting it right costs ≈A$0 to ≈A$6,440 at independent workshop rates, shown as an approximate guide in Australian dollars. 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 13 documented faults on the Hyundai Ioniq 5.

Vehicle: Hyundai Ioniq 5
Years: 2021–2024
Fuel: ev
System: Electrical

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 faults13 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph of the 12V battery yet. We would rather show none than show a picture of a different part.

What goes wrong

On the NE Ioniq 5 (E-GMP platform) built 2021 to 2024, failure of the Integrated Charging Control Unit (ICCU) is a known issue. An internal transistor can fail and open the ICCU fuse, so the 12V battery stops being charged from the main battery, warning lights come on and the car can lose drive power or end up immobilised. Hyundai Australia ran a service campaign in 2023 and two recalls in 2024 (REC-005942, then REC-006224) to update the ICCU software and inspect or replace the unit free of charge. Owners in Australia and Canada report repeat failures after the recall work, so ask what was done and when.

What you would notice

12V battery or charging system warning on the dash
Car will not switch on or goes dead after sitting
Sudden loss of drive power or reduced power while driving
A pop or bang from under the car followed by warnings
AC charging fails to start

How to check it

Where to look. ICCU under the rear seat area, next to the high-voltage battery

Ask for the service history showing recalls REC-005942 and REC-006224 and campaign 30D079 were completed, and whether the ICCU was replaced. Switch the car on and look for any 12V, charging or EV system warning. Plug into an AC charger if one is available and check that charging starts. Test drive and watch for warnings or power loss. If a workshop inspection is possible: have a Hyundai dealer run a VIN recall check and read ICCU fault codes and the 12V battery charge history.

Parts involved: 12V battery.

What it costs to put right

≈A$0 to ≈A$6,440 at independent workshop rates, shown as an approximate guide in Australian dollars. That is for this job on its own, not for the car.

An estimate, converted to Australian dollars, 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

“Have the ICCU recalls REC-005942 and REC-006224 been done, and is there a dealer invoice?”
“Has the ICCU ever been replaced, and how many times?”
“Has the car ever gone dead or lost power while driving?”
“Has the 12V battery been replaced?”

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 still has money owing on it, has been written off or reported stolen, what kms it showed in past sale ads, whether it has had accident repair claims and what it is worth today. That comes from the official records for that plate. Enter the plate and its state for the A$17.90 Vehicle Check, or the full history from A$24.99.

Where this comes from

The failure described above is documented in the sources below. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them.

Hyundai Ioniq 5 buyer questions

Is iccu failure: 12v battery stops charging, loss of drive power (ne ioniq 5, e-gmp, recalls rec-005942 and rec-006224) serious on a Hyundai Ioniq 5?

We rate it critical and common on the Hyundai Ioniq 5. On the NE Ioniq 5 (E-GMP platform) built 2021 to 2024, failure of the Integrated Charging Control Unit (ICCU) is a known issue. An internal transistor can fail and open the ICCU fuse, so the 12V battery stops being charged from the main battery, warning lights come on and the car can lose drive power or end up immobilised. Hyundai Australia ran a service campaign in 2023 and two recalls in 2024 (REC-005942, then REC-006224) to update the ICCU software and inspect or replace the unit free of charge. Owners in Australia and Canada report repeat failures after the recall work, so ask what was done and when.

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

≈A$0 to ≈A$6,440 at independent workshop rates, shown as an approximate guide in Australian dollars. 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 2021–2024 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.