Hyundai Ioniq 5 77.4 kWh AWD

The ICCU manages how the main high-voltage battery charges the auxiliary 12V system. When it fails, the 12V battery drains and the car loses all drive power, displaying a 'Check Power Supply' warning. Hyundai has recalled over 145,000 E-GMP vehicles worldwide for this issue (recall 24V-204), with dealers performing software updates and replacing the ICCU unit and fuse. Consumer Reports data suggests 2-10% of E-GMP owners experienced ICCU-related issues depending on model year. Some owners report recurring failures even after the recall repair. Out-of-warranty replacement costs approximately 1,500-3,500 EUR. Most cars should still be within Hyundai's 5-year warranty or covered by the recall regardless of warranty status. Verify recall completion before purchase and scan for stored P1A fault codes.

Widespread issue across the Ioniq 5 range. Hyundai identified multiple causes: unauthorized third-party Bluelink apps making up to 5,000 server requests per day, charging port controller faults, and ICCU-related overcurrent. Early 2021-2022 cars were particularly affected. Hyundai addressed the Bluelink issue in January 2023 by limiting server traffic to 20 transactions per day and blocking problematic apps. Replacing the OEM lead-acid battery with an AGM type can help prevent voltage spikes that damage the ICCU. A replacement 12V battery costs 150-250 EUR, plus 50-100 EUR labor. Cars that sat for extended periods without a trickle charger are more likely to have damaged batteries. This issue is more nuisance than safety risk, but repeated deep discharges can accelerate ICCU failure.

AWD Ioniq 5 models are equipped with a heat pump for efficient cabin heating. When the compressor or its inverter fails, heat production falls back to the less efficient PTC resistive heater only, and remote climate pre-conditioning stops working entirely. Hyundai TSB 22-71-001 addresses this by replacing the PTC heater control unit. Some cars have been in dealerships 4-5 times with multiple component replacements before the issue was resolved. Successful repairs typically require replacing the compressor, inverter, refrigerant, and high-voltage fuse. Parts can be backordered 4-7 weeks from Korea. The compressor alone costs approximately 1,000-1,400 EUR, plus substantial labor. This issue is specific to AWD models and does not affect RWD variants without a heat pump.

The Ioniq 5 AWD uses a dog clutch to mechanically disconnect the front motor from the axle when not needed, reducing drag and improving range. This disconnect mechanism can develop noises ranging from a high-pitched whine between 100-120 km/h to a pulsating vibration or growling from the front. Forum reports from Germany suggest roughly 50% of AWD models are affected to some degree. In some cases, a magnet inside the front motor/gearbox assembly detaches. Dealer repair involves replacing the complete front motor/clutch assembly, which costs 1,500-3,000 EUR out of warranty. Many cases are resolved under the 5-year warranty. The noise can be intermittent, making diagnosis difficult.

One of the most commonly reported Ioniq 5 complaints. The noise comes from the tailgate bump stops, latch striker, rear seat belt clips, or loose components in the cargo area. In a near-silent EV, this is very noticeable. Hyundai has issued multiple TSBs: 23-BD-006H and 24-BD-012H, the latter providing updated larger and softer bumpers that effectively eliminate the noise. Under warranty, the fix is free. DIY solutions include adding velcro strips to bumper stops or applying electrical tape to the latch striker. Out of warranty, parts are inexpensive but dealer diagnosis and labor can reach 200-300 EUR if multiple noise sources need addressing.

Particularly common on 2021-2022 models. The infotainment system can become unresponsive, freeze completely, or lose Bluetooth connections. The system can be reset using 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 experienced failed OTA updates that left the screen blank, requiring a dealer visit for a manual reflash. Persistent problems may require head unit replacement at approximately 500 EUR out of warranty. Most issues are resolved by keeping software up to date. This is more of an inconvenience than a safety concern.

A known design limitation across all E-GMP platform cars. The AC charging inlet can overheat when charging at the maximum 48A/11 kW rate, tripping the temperature sensor. Hyundai TSB 23-EV-003H addresses this with a software update that monitors port temperature and throttles the charging rate when it rises. The practical workaround is to reduce the charging current to 32A (approximately 7 kW), which is still sufficient to fully charge overnight. If the connector is physically damaged from overheating, a new charging port assembly costs 300-600 EUR. This primarily affects home charging at maximum rate in warm ambient conditions.