A Phenomenal EV Ruined by Baytown Hyundai's Service & ICCU Defect
When the 2025 Hyundai Ioniq 5 is actually on the road, it is a fantastic electric vehicle. The ride is quiet, the charging speeds are incredible, and the design is unmatched. Unfortunately, the car's potential is entirely overshadowed by critical hardware defects and an abysmal customer service experience at Baytown Hyundai.
The issues began at delivery. The dealership completely failed to provide the standard charging adapter with the vehicle. For a modern EV, the adapter is a fundamental necessity, not a supplementary accessory.
The situation escalated from an annoyance to a major problem when the Integrated Charging Control Unit (ICCU) failed. The ICCU is responsible for managing the high-voltage battery and the 12-volt system, and its failure is a widespread defect across the Ioniq 5 lineup that can lead to a sudden loss of motive power while driving. After my vehicle threw the diagnostic codes for the charging control unit fault, it had to be towed in for a warranty repair.
The car sat in the service lot for over a month. While waiting on backordered parts for a known recall issue is frustrating, the total lack of communication was unacceptable. For over four weeks, the service department held my car without providing a single proactive update. I was left completely in the dark regarding the status of a major high-voltage system replacement. This ICCU defect is serious enough that it has triggered a federal investigation and an active class-action lawsuit over allegations that the replacement units are just as defective as the originals.
The Ioniq 5 is a great piece of engineering when it functions, but you are rolling the dice with the ICCU's reliability. Buy the car for the tech, but be prepared for a miserable dealership experience.
Verified Owner
