Electrical system warning lights came on and loud alarm indicating the need to stop the vehicle immediately. Diagnosed by mechanic as ICCU failure and associated 12V battery issues-?"so, typical Ioniq5 problems. Just lucky I wasn-??t driving on the highway.

- Woodinville, WA, USA

The vehicle made a loud popping noise and lost motive power. Dashboard lit up with battery symbol and said to check electric vehicle system. Dealer service is certain it is an ICCU failure. The vehicle had the software update to -??fix-?? the ICCU issue thousands of miles ago.

- Newton, MA, USA

12v battery died this morning. The car main battery had 77% state of charge and still the 12v failed. The main battery is supposed to charge 12v as long as it is above 20% state of charge. This seems to be a wide spread problem and Hyundai is not taking any pro active steps in resolving this. All recommended TSB (Technical Service Bulletin) has been applied on the car and car was serviced last week and passed the multipoint inspection.

- Piscataway, NJ, USA

I heard a pop from the rear of the car and warnings came up on the dash. The vehicle was power limited and needed to be towed to the dealer. It was diagnosed as an ICCU failure and blown fuse. This was the problem supposedly addressed in Hyundai TSB 997 (NHTSA ID Number: 10240086). That service was performed on the vehicle in September 2023. We were lucky the incident occurred on a city street and not on a freeway or rural highway where the sudden loss of power could have been very dangerous. The software fix applied under Hyundai-??s TSB clearly did not fix the issue.

- Silverdale, WA, USA

I was waiting to charge up my EV when the dashboard started lighting up red. Stating to turn off vehicle due to battery failure and safety. And then all of the sudden the car just turned off. And would not come back on. So my husband had to go rent a vehicle at Avis so we wouldn-??t be stranded so far from home. And to continue to go to work. So after 30 minutes my husband suggested that I try and restart the car and it did come on. We were stuck in the freezing elements due to the battery failure. Which seems to be an issue that they had back in 2022. That wasn-??t correct or thought to have been. After I did some research yesterday 1/24/24. I called and made the local dealership aware of what I discovered that I took my car to. Because they couldn-??t see if they would get same issue but they stated they didn-??t.Also called into road side assistance on the day of the incident to have the car towed. But canceled after the vehicle started back up after 30 minutes with no response.

- Sauk Village , IL, USA

The Ioniq 5 has a serious problem with 12 volt battery drain. Three times, I have returned from vacation and found that the 12 v battery was completely dead. This is a huge issue if a consumer cannot rely on their vehicle to start in an emergency. I called a dealer in Renton, Washington about the issue and the technician responded, "This is a common issue in these types of vehicles." I am sorry, but that is not acceptable and is a vehicle defect. With electronic doors, you cannot get into the vehicle to jump start it, if the vehicle is locked, unless you can pull the manual key from the key fob and open it with the key. 12 v battery drain is killing the lifespan of the battery. Looking on the internet, other owners are complaining of the same issue. My vehicle sat for one week two times in December and I just returned form a two week vacation to find the battery completely dead. I only have 4484 miles on the vehicle and it is a 2023 car, so it is not an old battery. The car has a serious electrical defect.

- Renton, WA, USA

This model has known issue. As I found after it occurred to my brand new IONIQ 5. It has only 320mi. It had 87% battery and all of sudden it stop on road. No power on dashboard. After taking to service station they found -?? "Inspected and found code P1A9096- DC/ DC converter input voltage sensor fail. Referenced campaign 997 for concern. With code present, per TSB, replace ICCU and fuse." This same issue I noticed in 2022 after reading forum. After putting my car in service station still I don-??t have my car. It-??s almost 17 days. If this car had recall I could have saved my time and unnecessary effort. Plus thank god it was local city read( school zone) if I was in highway and same thing happen to me it might be life threatening situations.

- Parker, CO, USA

Intermittent Electrical / Brake failure. Put vehicle in reverse. Brakes failed to stop vehicle. Vehicle has had electrical issues before. Waring lights came on for steering and tire pressure in the past. Recall then came from Hyundai for the ICCU.45 minutes before the collision, the front collision warning came on when I was stopped at an intersection with no one in front of me. I stopped the vehicle and turned the vehicle off. Turned on the vehicle and it reset the warning lights and sounds, and I continued to drive. Later while pulling out of a parking space in reverse, I stepped on the brakes but the vehicle did not stop. I pumped the brakes to no avail. After the collision, the brakes worked again when the tow truck driver placed the vehicle on the flatbed.The Hyundai dealer, after the vehicle had been in their possession for several weeks with the battery disconnected, said there was no problem They also had a factory rep look at the vehicle and he made a report. We have not been able to get a copy of the report. Vehicle is still at the dealership. When notified by the factory rep of their claim that the vehicle had no problems, the vehicle had been out of service more then 30 days.

- Scotts Valley, CA, USA

The following is an incident that happened yesterday to my wife, who is an experienced driver: Whilst driving south on I5 from Seatac toward Tacoma in heavy rain with surface spray the screen above the steering wheel mentioned collision avoidance was not working and radar was not working. When I applied the brakes to slow down no response from the brakes. I then let off the brake and tried several times to apply the brakes each time with no success. I still had full control of the steering and could still steer the car. This lasted for about 30s then the brakes started working again. The error messages regarding collision avoidance and radar not working would continue to pop up even after the brakes were working. After stopping the car and turning it off and restarting several hours later the car no longer displayed any error messages. No vehicle or passenger were hurt in this incident, however if the traffic had slowed or stopped this outcome could have been very different.

- Redmond, WA, USA

Stop vehicle and check battery supply error and the car died. No power whatsoever. Likely linked with the faulty ICCU issue.

- Ellicott City, MD, USA

I started getting the error Electric Vehicle System error in my month old Ioniq 5. After driving a few miles, the air conditioning stopped working completely. And after a few more miles, the vehicle started to throttle down the speed to 20-25mph that too on the I95 with a 65mph speed limit. Had to turn on the emergency lights and drive slowly till I reached my destination. After googling for a while, I found that this issue is related to the ICCU failure that is pretty common in the Ioniq 5 and Hyundai is yet to issue a permanent fix for this problem. I don-??t know why we are allowing the sale of these vehicles with known issues. You can even Reddit the ICCU issue.

- Newark, DE, USA

Car: 4 month old 2023 Ioniq 5, Starting on September 12, 2023 my car would not take any charge AT ALL, effectively make my car useless as I am down to 10 miles of range. For the next several days I tried multiple chargers at different locations trying both 350 kW and 7kW chargers. Other cars were able to charge their cars immediately after I moved from the charger. I have read that the software update I am going to get will reduce my charging capacity rate to fully charge slower. This car is not performing at the stats I chose it for. I will not be able to use this car if it cannot take fast charge for a full charge. I was not made aware of this issue that was well known to Hyundai (they have been dealing with this issue with its earlier Ioniq models) before going forward with this car. Nor would I have decided on this car if this issue was known to me.

- San Francisco, CA, USA

9/11 Saturday lease deal agreed 9/13 car picked up 9/23 Air conditioning stopped working and car throws a warning message requesting immediate service. 9/25 Parts required to fix the problem not available in the US or Canadian Hyundai Parts inventory and dealer does not know when they will get the parts. 10/3 Dealer advises no update on parts. Hyundai Customer Care notified today and is investigating. From what I can determine, this is the dreaded ICCU issue which plagued the 2022 Ioniq 5.

- Bella Vista, AR, USA

Rear electric motor overheating on highway and motor shuts off only allowing front motor to work but acceleration is near nothing and is extremely dangerous. No codes or warnings pop up was told by friends with other ioniqs that it's a electric motor oil pump that malfunctions but hyundai refuses to solution ND realize that there is a problem with motor malfunction

- Palmdale, CA, USA

While driving on the highway, after about 45 minutes, the electric vehicle goes into Turtle power-limited mode. The vehicle instantly reduces in speed from 70mph to as low as 35 - 45 mph. There are no warning lights or sounds. If you immediately stop the car and let it sit, it will work again temporarily but after 30 - 40 more min or less of driving, it will again go into turtle mode. Additionally, acceleration is non-existent when its power is limited, inhibiting the ability to safely drive as required to pull over or across intersections. This has been a constant event occurring multiple times and each time the vehicle has been on a freeway or highway. The dealer applied the repairs in the photo supplied, but they did not work.

- Phoenix, AZ, USA

I took possession of my vehicle 1/12/23 and charged it successfully in my garage with my level 2 charger at 48A per Hyundai's specifications until May 19, 2023. Charging aborted prematurely on that date due to overheating of the charging port. Starting May 20, 2023 I lowered the charging rate in my level 2 charger to 40A despite Hyundai's stated specifications that 48A was supported. I also started tracking my charging with an OBD2 scanner and noted the AC Inlet 1 port temperatures. From 6/26/23 to 7/25/23 as summer temperatures in my garage here in NJ from 75 to 84, peak port temperatures reached 226 to 237 degrees but charging completed. On 7/28/23 with a garage temperature of 86, port temperature reached 239 and charging aborted again. I then had to lower the charging rate to 36A. This is lengthening my charging times and is not consistent with Hyundai specifications when I purchased the car. I am concerned I will have to continue lowering the charging rate to continue operating the vehicle. These high temperatures may also be dangerous. Hyundai so far has merely issued a Technical Service Bulletin 23-EV-003H that does not fix or replace the inadequate part(s), it merely slows down charging inconsistent with their specifications. This is not acceptable and as a safety issue NHTSA should require Hyundai to recall and replace the insufficiently performing part(s). My car is available for inspection. This overheating and lengthening charging time is a safety issue. The vehicle has not been inspected by the manufacturer or local dealer. There were no warnings of these occurrences. Charging simply halts when it exceeds 237 degrees Fahrenheit for my 2023 model.

- Monroe Township, NJ, USA

Level 2 Charging intermittently shuts off or is throttled back to very low charging rates. THis results in car not being charged enough to be used. Hyundai advertises charging rates of 10 KW, but charging is either throttled back to 5 KG or shut when charging at 48 AMps.. Hyundai claims to know of this problem where some internal components of car overheat.

- Yorktown Heights, NY, USA

Our car repeatedly fails to complete charging using Level 2 chargers at 48-amps. The car sends an overheating error, stops charging and then starts charging again later (presumably after it has cooled down). Sometimes is fails to restart charging completely. This makes it impossible to get a fast, reliable Level 2 charge in a timely manner. We get a text to our cell phones alerting us that charging has stopped due to overheating. We have notified our dealer and they are offering a software patch from Hyundai that simply slows the charge amperage to 28-amps when an overheating error occurs rather than offering a hardware solution that allows for full 48-amp Level 2 charging as the car is supposed to be capable of.

- Oldwick, NJ, USA

When driving in I Pedal mode (which is the one-pedal mode), the brake lights do not light up when decelerating, and it almost caused us to be rear-ended yesterday. Drivers pull aside me and tell me my brake lights don't properly come on when I slow down. Apparently this defect was on the national news several months ago and Hyundai promised a software fix by mid-July. I was just at the Carlsbad, CA Hyundai Service Center this morning and was told they do not have a software fix for this issue. This car should officially be recalled by Hyundai and the NHTSA and owners should be warned officially they are driving a dangerous, defective car.

- Carlsbad, CA, USA

My car fails to charge using Level 2 40 amp charger. The car is supposed to be able to maintain charging between 40 and 48 amps. It is clear that the car is overheating during Level 2 charging and suspending charging. This can be dangerous especially if the car is advertised to be able to charge normally using Level 2 chargers. Note that the summer has been hot. Even in my garage at night, I can no longer charge at 40 amps. I have to lower my Autel charger's current down from 40 amps to 32 amps, and that seems to work. Outdoors during the day, I have to change the car's current to 60%, just so it can continue to charge without overheating. My car is less than 6 months old.

- North Las Vegas, NV, USA