Summary
- Integrated Charging Control Unit (ICCU) is a part in Hyundai Ioniq 5 and other E-GMP-based EVs that can fail, causing the vehicle to lose power and require towing
- There have been recalls to fix the ICCU issue, but some drivers have reported failures even after repairs were done
- Technicians fix the ICCU issue by scanning for a specific diagnostic trouble code and updating the software or replacing the ICCU and fuse
- About 1% of the vehicles involved in the recall may experience ICCU failure, with overvoltage being a primary cause
- Some drivers have had multiple ICCU failures even after recall work was done, leading to frustration with Hyundai’s service department and questioning the quality of the fix
Article
The Integrated Charging Control Unit (ICCU) in Hyundai Ioniq 5 and other E-GMP-based EVs is a crucial piece of hardware that handles charging controllers and power export functions. However, failures in the ICCU, specifically in the part that charges the 12V battery, have caused issues for some owners, leading to their vehicles losing power and becoming inoperable. While failures are relatively rare, high-profile incidents have resulted in extreme trepidation among owners, despite recalls being issued to address the problem.
The ICCU is located on top of the battery pack and under the rear seats, making it accessible for technicians to diagnose and fix. Various recalls have been issued in the United States and other parts of the world to address ICCU failures in different Hyundai, Kia, and Genesis EV models. The failure of the ICCU can be attributed to overvoltage during the battery charging cycle and thermal loading during charging or driving. To fix the issue, technicians typically update the software of the ICCU and replace the necessary components.
The software update changes the way the ICCU charges the 12V battery and modifies the operation of the DC-to-DC converter to reduce overvoltage issues. Despite the recalls and remedies applied to affected vehicles, some owners have reported multiple ICCU failures, even after their cars underwent repair work. This has led to frustration and skepticism among owners regarding the effectiveness of the recall fixes and the reliability of the vehicles.
Owners who have experienced ICCU failures have expressed their dissatisfaction with the situation, with some waiting extended periods for their vehicles to be fixed. Despite efforts to address the issue, including contacting Hyundai for guidance on mitigating the risk of ICCU failure, owners are left questioning the quality of the fixes and the accuracy of the reported 1% failure rate. The lack of transparency regarding post-recall failure statistics has also added to the uncertainty surrounding the ICCU issue.
While some owners have voiced their negative experiences with ICCU failures and subsequent repairs, others may have had successful outcomes with the recall remedies. It is essential for owners to stay informed about the recalls and take necessary actions to address any potential issues with the ICCU in their Hyundai, Kia, or Genesis EVs. Despite challenges and concerns raised by affected owners, the majority of vehicles are expected to function normally after the necessary updates and replacements are performed.
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