2023 Hyundai Ioniq 5 Fuel system Problems

“Upon attempting to merge onto a highway, the vehicle lost acceleration and a warning message appeared on the dash stating Stop vehicle and check electrical system . Car speed was limited to 28 mph. I was able to exit and get the car to the dealership. This was on January 29th, 2025. Car was finally returned to me with a new ICCU on March 19th, 2025.”

“My wife was driving our Ioniq 5 on the freeway. She received a message on the dash about the electrical system (probably ICCU failure), and then the car limited itself ( turtle mode ) so that the max speed was 20mph. A minute or two later it slowed down even further to 10mph. She was able to get off the freeway safely.”

“While charging my vehicle at home using a level 2 charger, the ICCU failed. When it failed, it caused a power surge and my level 2 charger “exploded.” It also caused the master breaker to trip, cutting the power off to my entire house. The vehicle no longer charges, will not drive over 25mph and has to be towed to a dealership for repair. Also, the level 2 charger is fried and no longer works.”

“The ICCU in my car has failed twice, within an 8 month period. At each occurrence, after starting the vehicle, a loud pop was heard. The pop sound is known to be the fuse in-line with the ICCU. After driving the car a short distance, the dashboard displayed warning messages to Check Electric Vehicle System and to pull the car to a safe area. Fortunately, I was not moving fast and I was able to get the car safely parked within a few minutes.”

“These cars had an open campaign earlier in the year to check for faulty ICCUs. Mine was check in Jan and deemed to be good. In early Feb I was driving home alone late at night and suddenly I was unable to go faster than 20mph and in a matter of minutes the car shut off. It had to be towed and the dealer informed me the ICCU failed. It was very scary and extremely dangerous. This has been happening so often with the Ioniq 5's and there should be a mass recall.”