26 of the
199 complaints filed about the Hyundai Ioniq Hybrid
are about the braking system —
13% of everything owners reported.
The worst model year for it is 2022.
The contact owns a 2022 Hyundai Ioniq Hybrid. The contact stated that while driving at various speeds and while passing a nearby vehicle on the left lane or while a street sign was nearby on the right side, the vehicle would independently apply the brakes without the brake pedal being depressed. No warning lights illuminated. The vehicle was taken to a local dealer, where it was diagnosed; however, the failure was not identified. The manufacturer was made aware of the failure. The failure mileage was approximately 300.
NHTSA complaint #11740138 — an unverified report by a vehicle owner.
Electric parking break and auto hold sensor lights on dash, manual indicates malfunction. Hyundai service center has investigated and replaced the faulty sensor but issue still remains.
NHTSA complaint #11724369 — an unverified report by a vehicle owner.
What component or system failed or malfunctioned, and is it available for inspection upon request? Braking and acceleration control, yes How was your safety or the safety of others put at risk? The car continued to move/accelerate after depressing the brake pedal, and upon applying additional force continued to move forward, this could lead to a situation where a diver is unable to stop their car when they need to. Has the problem been reproduced or confirmed by a dealer or independent service center? No Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? The vehicle was inspected by a Hyundai service center on 10/09/2025 (For a similar concern and related damage) and the event occurred on 10/12/2025 Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? There was no warning lights, symptoms (other than the prior occurrence of this issue). The issue was first noticed on 10/3/2025 when the vehicle accelerated while the driver was depressing the brake and damaged the undercarraige.
NHTSA complaint #11693129 — an unverified report by a vehicle owner.
While attempting to park and depressing the brake the car made a sudden acceleration without input and hard braking did not slow the car. The car then impacted the curb. On another occasion while stopped at a red light the car began to move forward while the break was depressed. Pressing the break with additional force did not stop the vehicle and it continued to roll forward.
NHTSA complaint #11692977 — an unverified report by a vehicle owner.
The Electronic Parking Brake (EPB) on my 2022 Hyundai Ioniq Hybrid has a recurring safety defect. The EPB warning light continues to come on and off intermittently even after EPB components were replaced. Diagnostic Trouble Codes C2416 and C2417 have been detected multiple times. This issue first occurred at around 10,000 miles, while the vehicle was still under factory warranty. At that time, the dealer only performed a cleaning procedure, which did not resolve the problem. Over the years, I returned to the dealer multiple times, but they refused to perform repairs unless the warning light was present during diagnosis. Frequently, the light turned off before inspection, leaving the defect unresolved. At approximately 87,000 miles, the dealer finally replaced EPB components at my expense (out-of-warranty repair). However, even after this replacement, the EPB warning light has continued to reappear, proving that the underlying safety defect was never fixed. This is a serious and ongoing safety concern. The EPB is a critical braking system component, and its failure could prevent the vehicle from safely parking or holding on a slope. Because this problem began during the warranty period, was never properly resolved, and persists even after paid repair and part replacement, I believe this represents a manufacturing defect that requires investigation and potential recall.
NHTSA complaint #11687467 — an unverified report by a vehicle owner.
The contact owns a 2022 Hyundai Ioniq Hybrid. The contact stated that while operating the vehicle with the Smart Cruise Control activated, the EPB (Electronic Parking Brake) warning light activated. Additionally, while stopped, the EPB erroneously deactivated, causing the vehicle to drive forward, and the driver had to manually depress the brake pedal to stop the vehicle. The contact stated that the vehicle almost struck a pedestrian during the failure. The vehicle was taken back to the dealer who was unable to determine the cause of the failure. The contact stated that on another occasion, while driving at an undisclosed speed, the vehicle suddenly lost automotive power and was towed to the local dealer who diagnosed that the transmission was faulty and needed to be replaced. The vehicle was not yet repaired. The failure mileage was 40,000.
NHTSA complaint #11681582 — an unverified report by a vehicle owner.
THE 12V ION BATTERY SYSTEM PART NUMBER 37507-G2120 (ICCU) BATTERY FAILED WHILE DRIVING, CAUSING GAS ENGINE TO TURN OFF, WHICH CANCELS POWER BRAKING AND STEERING, MAKING VEHICLE IMPOSSIBLE TO CONTROL. READ MANY REPORTS ON REDDIT AND IONIQ FORUMS OF THIS HAPPENING. NO. IT IS UNOPERABLE THERE WAS NO WARNING WHAT SO EVER. NO LIGHT, NO SYMBOL, NOTHING. WAS TRAVELING 40 MPH ON A BUSY ROAD WITH FAMILY, DURING A LANE CHANGE THIS HAPPEND AND THE VEHICLE TURNED OFF COMPLETELY. I COULD NOT CONTROL VEHICLE, AND WENT INTO A DITCH. IN THE PROCESS WE WERE NEARLY SIDE SWIPED BY A LARGE PICK UP TRUCK WHOM ALSO WENT IN DITCH. THE 12V BATTERY WAS DEAD COMPLETELY, WOULD NOT START THE GAS ENGINE. JUST WAS DEAD. IM LUCKY TO BE HERE TELLING OUR EXPERIENCE.
NHTSA complaint #11665873 — an unverified report by a vehicle owner.
The "Auto Hold and EPB" yellow indicator light constantly turns on, which, according to the owner's manual, suggests a sensor issue. When I press Auto Hold after starting the car, the light comes on immediately. Even if I don’t press the Auto Hold button, the light still turns on. Yesterday, after driving approximately 9 miles, the light came on again and began beeping every 7 to 8 minutes while driving.
NHTSA complaint #11649909 — an unverified report by a vehicle owner.
Electric Parking Break and Auto Hold lights, with system disengage. History of electrical short in codes system. Falls under Hyundai technical service bulletin # 23-BR-001H. Dealer ship refuses to repair if lights are not currently on. According to bulletin must be repaired if on or in history. Same Issue as NHTSA # 11617668 and NHTSA# 11633119
NHTSA complaint #11637638 — an unverified report by a vehicle owner.
EPB and auto hold lights come on intermittently with no user input or obvious reason. This does not occur every time that the vehicle is driven and does not have an obvious cause nor pattern. When issue appears, it may sometimes but not always be resolved by parking, then restarting the vehicle. After the issue begins, there is an audible beep and an alert/warning flashes for less than a second within the instrument cluster. The audible beep and screen flashing occurs rapidly and repeatedly after appearing. This appears to be the same issue as NHTSA ID 11617668 Per my own research, other owners of this vehicle have had the same issue, as noted in this forum thread: [XXX] Additionally, the solution according to other owners of this vehicle is listed in Hyundai's TSB 23-BR-001H (listed in NHTSA ID 10235346 from April 7 2023 as MC-10235346-0001), which is listed at [XXX] . This TSB's document does include the 2022 Hyundai Ioniq Hybrid, though the NHTSA listing erroneously lists only the 2019-2021 models as being affected. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
NHTSA complaint #11633119 — an unverified report by a vehicle owner.
Auto brake fault has been a constant issue with this 2021 Hyundai Ioniq Hybrid. This causes lots of system functions to stop working (adaptive crusice control, lane keeping assistant, etc.) The dealer originally replaced the wiring harness, but it came back again and again with the same issue. They finally figured out that replacing the rear calipers seemed to make it stop. They have done that twice and this past weekend the fault warning appeared again. So, for the 4th time, we will be taking the car back in so this error goes away. For additional details, I will give you the most recent time, but note that the other 3 times all happened with in the first 1-3 years of ownership.
NHTSA complaint #11618338 — an unverified report by a vehicle owner.
The Hyundai Ioniq was designed with a dual clutch system for the electric motor and gas motor. This was done to disengage and engage either separately when necessary for low power, regen braking, etc. However, this design heavily impacts the behavior of the brakes and safety of the vehicle overall. When the brakes are applied, the ECU will turn off the gas engine to conserve gas in regen braking mode. Additionally, the ECU will downshift the transmission. Downshifting the transmission and disengaging the gas engine become an issue because conducting both actions removes significant resistance in braking. Causing the vehicle to lurch when the downshift occurs while also increasing stopping distance. This downshift can be felt when braking as both loss of brake power and vehicle lurch. The system also does not account for this brake power loss by increasing brake booster response.
NHTSA complaint #11597774 — an unverified report by a vehicle owner.
On a recurring basis, the warning lights come on for”AUTO HOLD” and “EPB” or emergency parking brake. Car continually beeps and gives warning until car is reset. During this time, the cruise control will turn off, causing safety issues during travel. Also, the other safety features seem to stop working during the time this warning is activated. Emergency stop, et cetera. Only activated when vehicle is operating under highway mph. Typically local roads with stops/starts trigger this issue. Mechanics have no idea what is wrong with vehicle warning. I see online that this is a common issues with Hyundai Ioniq. A possible recall is needed to investigate/fix this issue as local dealerships arent aware of a solution.
NHTSA complaint #11588365 — an unverified report by a vehicle owner.
Integrated Brake Accuation Unit failed per dealer repair location. Codes indicated on attached repair invoice receipt. (Document is Uploaded). This was a very expensive repair. Per dealer service advisor and technician they had never seen this before. 2 brake lights on the dash indicated major brake failure. The vehicle was immediately taken to the dealer for repair. See additional details regarding concern, cause. correction, and parts replaced on invoice. If this had not been repaired immediately, this could have put others at risk and caused an accident. Although there are several internet references to brake problems with this model of Hundai Ioniq Hybrid, there are no recalls. The powertrain and engine are warrantied for 100K miles and the batteries have an original lifetime owner warranty. Due to the critical nature of a braking system, I believe braking systems on hybrids for this part should have a lifetime warranty. I want to make it clear that parts that wear out due to use for example brake pads, rotors, master cylinder etc. are not what I am referencing. Since the integrated brake accuation unit is a part commonly seen on hybrid products, I think this a part that warrants investigation and recall. This investigation may go beyond the Hyndai hybrid products. Due to the expense of the repair, I believe this repair could put the owners of all hybrid auto products at risk.
NHTSA complaint #11554721 — an unverified report by a vehicle owner.
The EPB light appeared on the dash panel of the car on 7/13/2023, along with the EPB light, the cruise control, the auto hold function, and the electric parking brake stopped functioning. The light will disappear on a restart and reappear after a period of time. It is indeterministic when the light will reappear on the dashboard. I have tried to contact the nearest dealer in an attempt to get the car inspected for safety reasons, however, the dealer was unavailable and Hyundai national customer service was unable to help. Hyundai's national customer service representative was also being deceptive as they transferred me to a dealer that is 425 miles away from the location I told them while giving me the impression that they were transferring me to a local dealer. The car was eventually inspected by two different Hyundai dealers. The first dealer informed me that there was a short on the wire which caused the error. However, due to the fact I was moving at the time, I could not wait for them to fix the car at that moment. They stated the vehicle was safe to drive and that I could bring the car to the new dealer once I moved to the new location. When I brought the car to the new dealer, instead of the wiring error, they stated that the radar of the car had failed. Since then, they have performed repairs on the car and the error has not yet occurred. This is a significant concern of safety due to various reasons. First, the electric parking brake is an important component of the car, as in the event of a break failure, the electric parking brake is the only backup to ensure the car can be stopped before any catastrophic event. Furthermore, according to the dealer, the actual component that has failed is the radar. However, I do not recall, at any moment, the car has warned me that the radar has failed. This could cause any reasonable person to assume the radar is functioning properly and believe that the forward collision-avoidance assist is still active with no
NHTSA complaint #11553326 — an unverified report by a vehicle owner.
Shortly after purchasing my Ioniq (roughly 2 months into ownership) my dashboard started beeping with warning signs for my EPB and auto-hold brake. I panicked and parked my car and tried to turn off the functions because I thought I had accidentally turned them on but they wouldn’t turn off. This would continue at random for roughly 7 more months until it would stay on for weeks at a time. I was told there was nothing the dealership could do about it and was asked about my oil changes. I get my oil changes within the intervals set for the vehicle and it does not seem to affect if the lights come on or off. They beep constantly and also the EPB and Auto-hold features do not work when the light comes on, the fail. It’s a safety risk as when I do try to engage them they don’t work and makes me fearful that they will short and work at random times which is a huge concern.
NHTSA complaint #11546636 — an unverified report by a vehicle owner.
While driving, the adaptive cruise control will randomly become disabled and 3 lights pop on: EPB, Auto Hold, and check engine (triangle with ! In the middle). Check engine light will turn off if ACC is turned of entirely. Problem will persist as long as car is on. Once turned off and restarted it will stay off for a while and then come back on. Stays off longer when car has an overnight break but other times it will happen as soon as it's turned on. Cruise control will not work when this issue appears. Picture shows milage but that was May 31st 2023, not the 1st time back in November, 2022. It happened the 1st time after a drive from Lancaster, CA to Pheonix, AZ on the return (about half way)
NHTSA complaint #11531869 — an unverified report by a vehicle owner.
On 12/25/21 less than 2 months after purchase, amber color warning lights came on dashboard saying "AUTO HOLD" and "EPB" light up on dash and a chime noise would sound when flashing message lit up. Since warning lights weren't red I understood the feature wasn't working, that it was safe to drive, but the chime was annoying when it came on about once a week. On 8/8/22 I took the car to Selma Hyundai and paid $168 to diagnose the intermittent flashing AUTO HOLD/EPB amber light alerts. They checked functions and said if persisted they would have to replace the left hand parking brake motor. On 9/8/22 I took the car again to Selma Hyundai as the problem persisted, After another diagnosis, they ordered a left rear caliper due to an open circuit. On 10/3/22 after waiting weeks for the ordered part to arrive, Selma Hyundai replaced the left rear brake caliper. On 12/20/22 I returned to Selma Hyundai for another diagnosis as the AUTO HOLD/EPB lights were again frequently alerting on the dashboard. Hyundai factory advised them to order and replace the left rear brake wiring harness. On 1/26/23 after waiting over a month for the part, Hyundai installed the new left rear wiring harness. I was now warned that the mechanic was now seeing codes from the right rear and if the alerts persist, they would have to order the right rear wiring harness. On 2/3/23 Friday evening, I was leaving my apartment with my mother to make a Costco run. Turned the car on and the AUTO HOLD/EPB lights were on and the emergency brake was flashing RED quickly on my dashboard. I turned the car off and back on with the same result. I tried to back out of my parking stall and could feel the car trying to roll back but the parking brake would not release. I tried to roll forward a bit and the parking brake would not release to let me roll. 2/6/23 Monday morning and Selma Hyundai told me to have car towed to them and they would order the right rear brake wiring harness. No wiring harness yet.
NHTSA complaint #11514514 — an unverified report by a vehicle owner.