IsItAGoodCar

Common Problems with the
2021–2023 Hyundai Ioniq 5

We've identified 3 known issues that can affect the 2021–2023 Hyundai Ioniq 5. 1 of these are serious faults that could be expensive to repair.

3
Known Issues
1
Serious
2
Moderate
0
Minor

The 2021–2023 period has 1 more issue than the Hyundai Ioniq 5 average across all year periods.

All Known Issues

ICCU Failure (Integrated Charging Control Unit)

SeriousElectrics & Electronics

The ICCU handles 12V charging from the high-voltage battery. Internal MOSFETs can fail due to overvoltage spikes, often blowing an internal 40A fuse and causing a total loss of 12V replenishment while driving.

Estimated cost: £0 (Recall/Warranty)Affects: 2021–2023Often appears around: Any

Typical symptoms

  • •"Check electric vehicle system" warning
  • •Audible "pop" followed by "Stop vehicle and check power supply"
  • •12V battery dies repeatedly
  • •Turtle mode

What to inspect before you buy

  • ✓Service campaign status for ICCU (TSB 24-01-086H)
  • ✓Scan for DTC P1A9096 (DC-DC Converter Error)

12V Battery Logic & "Orange Light" Confusion

ModerateElectrics & Electronics

The amber dashboard light indicates 12V charging. Logic bugs in early software would stop 12V maintenance if the HV battery dropped below 20%, leading to "bricked" cars even if the HV battery had plenty of charge for systems.

Estimated cost: £0 (Software update)Affects: 2021–2023Often appears around: Any

Typical symptoms

  • •12V battery flat despite HV battery being at 20-30%
  • •Car fails to enter "Ready" mode

What to inspect before you buy

  • ✓Confirm BMS and VCU software are at the latest revisions

Steering Column Knock/Clunk

ModerateSteering

A known issue where a bearing in the steering column or a friction point in the roll connector causes a knock or clicking sound when turning.

Estimated cost: £0 (Warranty)Affects: 2021–2023Often appears around: 5,000–25,000 miles

Typical symptoms

  • •Clunk felt through wheel at low speed
  • •Clicking when rotating steering wheel

What to inspect before you buy

  • ✓Manoeuvre at low speed
  • ✓Check for TSB 22-ST-005H/008H compliance

Buying Tips for the 2021 Hyundai Ioniq 5

  • ✓CRITICAL: Verify Recall 272 (ICCU) has been performed; this includes a software update and potential ICCU/fuse replacement.
  • ✓Check for the "Stop vehicle and check power supply" warning history, as this indicates a near-total 12V depletion.
  • ✓Listen for a "clunk" or "knock" through the steering wheel at low speeds or when parking.
  • ✓Ask if third-party apps (e.g., Optiwatt) have been used, as these can trigger 12V drain by repeatedly waking the car.
2024 Hyundai Ioniq 5

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Other Hyundai Ioniq 5 Year Periods

2021–20232024

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