What specific component is failing in affected Ioniq 5s?

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The Integrated Charging Control Unit (ICCU) is the component failing in affected Hyundai Ioniq 5 electric vehicles.

US auto safety regulators are investigating nearly 40,000 Hyundai Ioniq 5 electric vehicles due to reports of power loss while driving. This issue is specifically linked to a failure within the Integrated Charging Control Unit (ICCU), which plays a critical role in the vehicle's electrical system. The preliminary investigation by the National Highway Traffic Safety Administration (NHTSA) covers 2022 model-year vehicles.
Failure of the Integrated Charging Control Unit (ICCU)

The failure centres on the Integrated Charging Control Unit (ICCU), a component essential for powering both the main electric vehicle drivetrain and the lower-voltage 12-volt battery system. Reports indicate that an excessive current flow within the ICCU can lead to the damage of its internal transistors. This internal damage results in the unit's inability to effectively recharge the 12-volt battery.
Symptoms and Consumer Complaints

Consumers have reported a distinct loud popping noise, often followed by a dashboard warning message, immediately preceding a loss of power. The severity of this power loss varies, ranging from a noticeable reduction in acceleration to a complete cessation of power. One concerning account described a driver experiencing a complete loss of responsiveness while travelling at 120 km/h on a highway, with a semi-trailer truck in close proximity.
NHTSA Investigation and Hyundai's Response

The NHTSA's preliminary investigation has gathered information from over 30 consumer complaints. While no crashes or injuries have been reported in connection with this issue, the agency has confirmed the power loss experiences through owner interviews. In response, Hyundai has announced plans to launch a service campaign in July to address the problem. This campaign will involve updating the software of affected vehicles and, where necessary, replacing the ICCU.

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What specific component is failing in affected Ioniq 5s?

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