The contact owns a 2023 Hyundai Ioniq 5. The contact stated that while driving at higher speeds occasionally, the vehicle suddenly lost motive power. The "Smart Smooth Cruise Control Conditions Not Met" warning message was displayed on the instrument panel. The contact restarted the vehicle as a temporary fix; however, the failure recurred. The vehicle was taken to a local dealer where it was diagnosed with an unknown electrical failure. The vehicle was repaired; however, the failure recurred. The vehicle was taken back to the same local dealer; however, the cause of the failure could not be determined. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 47,000.
2023 Hyundai Ioniq 5: adaptive cruise control problems
12 of the 388 complaints about the 2023 Hyundai Ioniq 5 describe adaptive cruise control problems.
- owner complaints
- 12
- of this car's complaints
- 3%
- recalls
- 0
Is there a fix? 1 service bulletin covers this area of the car. See below
Adaptive cruise control problems by model year
What owners say
7 incidents of electrical drive problem incidents 1-3car would not start despite full battery Incident 4 same thing and car went to dealer, they said know problem and they would fix it overnight by downloading new software and charge about $400 for new 12V battery Incident 5 While on freeway using cruise control card speed varied wildly I disabled cruise control and with manual throttle same problem Incident. 6 In middle of traffic car went blank no lights or anything. I tried to restart 3 times and nothing, so I sat back and was in process of calling for tow. I did nothing and car violently accelerated and turned into steel pole. Only injury I had was bump on head that went away. As soon as the ghost mode engaged I hit the brake which likely prevented more damage to me, but front end of car was damage Incident 7 While I was detained someone else drove car to dealer and driver reported felt like driving on ice with rapid direction and speed changes Currently at dealer where neither dealer or Hyundai will take of problem and I get run arround from Hyundai and dealer. Dealer claim the don’t know is the problem. Dealer has had car for approximately 65 days Bottom line, the car is totally unsafe to drive and very dangerous
Failure of Integrated Charge Control Unit (ICCU). Vehicle stopped charging 12V service battery from main high voltage battery. Displayed "Check Electric Vehicle System" followed by "Stop vehicle and check power supply". Vehicle to operate normally though Cruise Control stopped working. Continued to drive the few miles to our home. Once home checked service battery with battery monitor. Showed 12.1V and did not show battery being charged with vehicle ON (Ready) or OFF. Had vehicle towed to Hyundai service facility where the ICCU failure was confirmed.
I suddenly received errors that my sensors weren’t working, and I can no longer use my cruise control. The car has less than 60,000 miles so it still has the full bumper to bumper warranty. I have never had a collision. So I took it in to the dealer and they said the camera was mis-aligned and is not covered under warranty. It should be covered as I’ve never had a collision. Based on my online research, many people with Hyundai Ioniq 5s have experienced this same issue at no fault of their own, so it is a systemic problem. I took the vehicle to the Pohanka Hyundai in Fredricksburg, VA
Vehicle stopped responding to all inputs while cruising on the highway. Vehicle was charged and running fine up until that point, for about 40 minutes of continuous driving. Accelerator pedal, regen paddle shifters, cruise control buttons all would not work and display was unresponsive. Vehicle slowly lost speed as if it was shifted into neutral, forcing us to pull over to the side of the road. Turning vehicle off, waiting for a minute, and turning it back on restored functions. Vehicle malfunction occurred right after a busy intersection on LA highways and we were able to make it to the shoulder, but if it had happened just 1-2 minutes earlier, we would have been in a lot of traffic merging in and out of lanes at significant speeds. There were no warning lights, messages, or auditory alerts during the occurrence. Vehicle simply lost all power. When I took it into the dealer for inspection the next day, the service staff were unable to find any issues or errors during diagnostics. Battery health was in the green and vehicle checked out fine and was released to me after a thorough inspection.
Incident occurred when head-in parking in a space pointed into an stores exterior wall. There were no parking/wheel stops, just pavement then wall. No adjacent cars. I was decelerating with foot completely off accelerator and over the brake pedal. The car is an EV and was in 3rd level of regenerative braking, slowing down quickly. As I completed the turn into the space and began straitening the wheel, the car suddenly and rapidly accelerated and crashed into the wall. The only likely explanation I have is that I inadvertently pressed the Driving Assist button with my right thumb or hand while turning the steering wheel, which would have activated Smart Cruise Control, and, if the necessary conditions were met, set the minimum speed to 30 km/hr. The car manual states: "If your vehicle speed is between 0 - 20 mph (0 - 30 km/h) when you press the Driving Assist ( ) button, the Smart Cruise Control speed will be set to 20 mph (30km/h)." The Foward Collision-Avoidance Assist was set to Active Assist, which should have applied the brake to stop from colliding with the wall, but instead the car accelerated. (Note, the parking assist feature does not usually recognize head-in parking.) The car has two Driving Assist settings: Based on Drive Mode and Based on Driving Style. If the latter is selected, three additional features are set on sliding scales: Distance (close to far), Acceleration (slow to fast), Response Speed (slow to quick). These three settings are adjusted automatically based on the car's interpretation of the driver's driving style, or they can be manually overriden. I have never changed these settings. Post-incident I checked the setting and it was set to Based on Driving Style with Acceleration=Fast. Concerns: Is Driving Assist to easy to inadvertently activate? Should Driving Assist not activate at very slow speeds and not auto-set to 30k/h? Why did Forward Collision-Avoidance not activate? Drive Assist should not default to Based on Driving Style.
I was driving at night on a freeway marked as a 65mph speed limit. I had the adaptive cruise control turned on and set to automatically follow the road speed limit. There was intermittent rain at the time. Suddenly my car began to accelerate, but I was able to stop the acceleration by stepping on the brake to disengage cruise control. I tried re-engaging cruise control and it immediately accelerated strongly again. That is when I noticed the cruise control speed had been set to 85mph. I disengaged cruise control for the rest of my trip home and was able to drive normally. Subsequently I learned that the car detects speed limits by both map data and visually recognizing speed limit signs, so I assume it mis-identified a 65mph sign as 85mph. The auto speed feature set the cruise control speed to 85mph even though that is much higher than any possible speed limit in California. I disabled the auto speed feature of the adaptive cruise control and have not had any problem since then.
The car loses power, slows down dramatically, and will not respond to the accelerator pedal. This failure has happened twice. The first time I was driving at about 40MPH on a side street when the car started slowing down with no warning and limped along at about 20MPH. I could not get it to move faster so I put my flashers on and made my way to the side of the street, pulled off of the road and shut the car off. When I restarted the car it drove normally. I reported the failure to Hyundai and they had never heard of this happening. They kept the car for 2 days and couldn't replicate the problem. That was about 2 months ago. Yesterday, 3/4/24, I was on the freeway going about 74MPH using the smart cruise control. I had just changed lanes when the car lost power and I got the message, "Smart cruise conditions not met." My speed dropped to the low 40's as other cars were whipping past me. Even though I floored the accelerator I got no response. I started the flashers, made my way to the right lane and got off on an exit ramp. I pulled off to the side of the ramp, parked the car and turned it off. Once again, when I restarted the car it performed normally. This is very dangerous! I could have easily been rear ended by another, faster car on the freeway since I slowed down so quickly without braking lights lighting. I brought it back to the dealer again today and they have kept it to run diagnostics. I don't expect that they will find any problem this time either.
I'm surprised there are no safety recalls on this vehicle given how Cruise Control operates & how close to the Cruise Control toggle switch the steering wheel is indented for hand placement at 10 a.m./2 p.m.We purchased a 2023 IONIQ 5 on 02/25/2023.When the vehicle was delivered to us we were not told that the cruise control does not disengage when the brake pedal is applied.It merely pauses.There is nothing in the owner's manual that addresses cruise control operation.In any other vehicle we have owned, including other Hyundai vehicles, cruise control cancels when the brake pedal is depressed.Without proper training/information & without cruise control being addressed in the owner's manual we had no way of knowing this.2 months after purchasing the vehicle, while pulling into a parking space driving 3 MPH I stepped on the gas & the vehicle returned to the previously set cruise control of 45 MPH.Whereupon it went over a parking bumper, landscaping, curb, $ into a busy street, scraping the passenger rear portion of the vehicle & damaging the wheel.We took the vehicle to the dealership, Larry H. Miller on 05/03/2023. They were unable to duplicate the mishap.The GM of the dealership indicated that in all probability what occurred was inadvertent touch of the toggle switch.He indicated that this unique cruise control operation was experienced by others, including himself.On 05/24/203, he recommended we contact Hyundai Motors USA to report the incident.Doing so resulted in numerous phone conversations, emails, and 2 inspections of the vehicle. Finally, on 10/19/2023 we were advised in a HMAUSA letter of resolution that said, "no manufacturing defect was identified." They are refusing to pay the $2,247.92 repair bill (on 04/26/23.May be higher now due to rising costs.)We maintain the incident occurred due to a design flaw & unique cruise control operation.We not only want Hyundai to pay for the repairs, we want the federal safety agency to investigate so this won't happen to anyone else.
Driving on freeway when adaptive cruise control turns off and had a sudden complete loss of acceleration, we had steering and brakes only. Sudden reduction of car speed in traffic could cause accident. Has only happened once in 20k miles. (no acceleration) Adaptive cruise control shuts off for no reason, but dealer couldn't replicate. In recent 8k trip we photographed warning on dash 17 + times after shut down. Dealer couldn't find any saved trouble codes for this. No warnings prior to any occurrence only after, dash turned off on acceleration loss.
Cruise control became disabled and then unable to accelerate when pressing down on accelerator
While driving on the interstate my 2023 Ioniq 5 SEL RWD experienced a failure with the front radar system stating that it was blocked. In reality there was nothing physically blocking the system which was verified on multiple pullovers to check the front of the vehicle. This caused the critical forward safety functions, HDA system, lane change assist functions, regeneration system, and smart cruise control to all be disabled. The car is available for inspection upon request and I have video of the car displaying the fault messages during the trip as it happened on multiple occasions.
Service bulletins that may apply
Related recalls
No recalls on record for this model year.
Questions about the 2023 Hyundai Ioniq 5 adaptive cruise
Is adaptive cruise control problems a common problem on the 2023 Hyundai Ioniq 5?
12 of 388 owner complaints about the 2023 Hyundai Ioniq 5 (3%) mention adaptive cruise control problems. The model year with the most reports is 2025.
Is there a recall or service bulletin for this on the 2023 Hyundai Ioniq 5?
There are 0 recalls and 1 service bulletin for the same area of the car. Check them below with your VIN.
Other symptoms on the 2023 Hyundai Ioniq 5
Loss of power 50Won't shift 23Overheating 20Battery drain 14Won't start 11Jerking 8
VIN decoder
See the problems and recalls for an exact car
Buying a used 2023 Hyundai Ioniq 5?
Check the exact car before you pay: accidents, salvage or flood titles, odometer readings and previous owners.
Check its history