Together for Better or for Worse: Kia EV6 and Ioniq 5 Under Investigation for Power Loss

Kia EV6 6 photos
Photo: Kia
Ioniq 5Kia EV6Ioniq 5Kia EV6Ioniq 5
The Kia EV6 and the Ioniq 5 are both undergoing investigation. Owners have pointed out a complete or partial loss of motive power. Both models had the exact same symptoms.
Owners reported a "loud pop noise" followed by the loss of power in their EVs while driving. A warning message subsequently showed up in the dashboard. Almost immediately after that, they sensed the partial or complete loss of power in their car.

11 Kia EV6 owners issued complaints, which prompted the opening of a new Preliminary Evaluation by the Office of Defects Investigation (ODI) in the United States. All affected vehicles are 2022 model year.

According to the official document issued by National Highway Traffic Safety Administration (NHTSA) and uploaded below, there is a "strong correlation" between the noise, the visual warning, and loss of power and the failure of the Integrated Control Charging Units. It is the ICCU that which powers the high-voltage and low-voltage batteries that deposit the energy necessary for driving.

ODI conducted several interviews with the owners to determine the exact cause of the failure. They indicated varying time intervals between the warning message and the loss of power.

Preliminary investigation shows that the cause of the issue may be an over-current in the ICCU, which affects the transistors in the DC-to-DC converter. The issue makes the 12V battery unable to recharge, leading to partial or complete loss of power. The vehicle systems become unresponsive.

As per the NHTSA document, the investigation should determine the exact scope and severity of the potential problem and assess whether there are any safety-related issues involved. The result of the preliminary investigation may lead to a recall. That means that 19,824 vehicle owners should make an appointment to the nearest Kia shop to solve the failure.

The exact same symptoms were reported in June by owners of the Ioniq 5 electric crossover. They mentioned complete or partial loss of propulsive power. 30 of them forwarded complaints to the NHTSA. The Administration started a preliminary investigation in this case as well. The results showed issues similar to those reported by the Kia EV6 owners.

Hyundai stated that a software update, available beginning next month, should do the trick. Possible affected components would be replaced following an appointment at the nearest Hyundai shop.

"The company was fully coopering with the investigation and was launching a service campaign in July to update the affected software," said Hyundai spokesperson Ira Gabriel.

Nearly 40,000 Ioniq 5s may be affected.

Both the Kia EV6 and the Ioniq 5 are built not the E-GMP platform and share the same electric motors and battery packs. The dual-motor all-wheel drive versions come with 320 horsepower (324 PS) and 446 lb-ft (605 Nm of torque), while the 77.4-kWh battery pack provides them with 316 miles (509 kilometers) of range.
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 Download: ODI document (PDF)


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