Hyundai Ioniq 5 58 kWh RWD

The ICCU manages how the high-voltage battery charges the auxiliary 12V system. Voltage spikes during charge start/stop and thermal stress during driving can damage internal components. When it fails, the 12V battery drains, triggering 'Check Power Supply' warnings and eventually complete loss of drive power. Hyundai has issued multiple recalls covering 2022-2024 models worldwide, with dealers performing software updates to reduce electrical stress or replacing the entire ICCU unit and fuse. Some owners report recurring failures even after the recall repair. Out-of-warranty ICCU replacement costs approximately 1,500-3,500 EUR including labor. Most cars should still be within Hyundai's 5-year warranty or covered by the recall, but second-hand buyers should verify recall completion and check for any stored fault codes.

Even before the ICCU recall, Ioniq 5 owners widely reported 12V battery drain issues. Hyundai identified multiple causes: excessive Bluelink server requests (up to 5,000/day from unauthorized third-party apps), charging port controller faults, and ICCU-related overcurrent. Early cars were particularly affected. Hyundai addressed the Bluelink issue by limiting server traffic to 20 transactions per day and blocked problematic apps. However, if the 12V battery was deeply discharged repeatedly, it often requires replacement even after the software fix. Replacement 12V batteries cost 150-250 EUR. Cars that sat for extended periods without a trickle charger are more likely to have damaged 12V batteries.

This is one of the most commonly reported Ioniq 5 complaints across forums. The noise typically comes from the tailgate bump stops, latch striker, rear seat belt clips rattling against hard trim, or loose components in the cargo area. Hyundai has issued multiple Technical Service Bulletins for this problem, with the most recent one replacing the bump stops with larger, softer versions. Owners have found DIY fixes including adding velcro strips to bumper stops, applying electrical tape to the latch striker, and tightening the spare wheel nut. While not a safety issue, it is very annoying in a quiet EV where road noise is minimal. Dealer repair under warranty is free; out of warranty, parts are inexpensive but diagnosis and labor can reach 200-400 EUR if multiple sources need addressing.

Particularly common on 2021-2022 models, the infotainment system can become unresponsive, freeze completely, or experience Bluetooth connection failures. The system runs on an embedded platform that can be reset via a hidden pin-hole button on the climate control panel (press with a SIM tool for 15 seconds). Hyundai has released multiple software updates to address stability. Some owners have experienced failed over-the-air updates that left the screen blank, requiring a dealer visit for a manual reflash. Most issues are resolved by keeping the software up to date, but persistent problems may require the head unit to be replaced (500 EUR out of warranty). This is more of an inconvenience than a safety issue.

In cold climates, the charging port door mechanism can freeze shut, preventing charging. Using silicone spray on the plunger before winter helps prevent this. More concerning are reports of CCS connectors becoming stuck in the port after DC fast charging, sometimes due to tight tolerances between Hyundai's port and certain third-party charger connectors. In rare cases, the deadfront plastic cap on the charging pin dislodges after fast charging. One owner reported a 2,400 USD repair quote, though most cases are resolved under warranty. Out of warranty, a new charging port assembly costs 300-600 EUR including labor.