2025 Hyundai Ioniq 5 Reliability Score & Common Problems

Owners of the 2025 Hyundai Ioniq-5 frequently report issues with the Forward Attention Warning (FAW) system, particularly when using adaptive cruise control and lane-keeping assist. Common symptoms include persistent false alarms indicating the driver is not paying attention, even when they are looking directly at the road. These false alerts often occur regardless of eyewear, though some owners note increased frequency when wearing glasses or sunglasses. Complaints suggest these issues arise shortly after purchase, with no specific mileage range mentioned. The false alarms can distract drivers, and some owners describe situations where driving assistance features are abruptly disabled, potentially leading to unsafe conditions such as sudden deceleration or unintended lane departure. This information is crucial for potential buyers to consider, especially those interested in the vehicle's driver assistance capabilities.

Owners report issues with the 2025 Hyundai Ioniq 5's fuel/propulsion system, particularly involving ICCU failures and high-voltage traction battery problems. Symptoms frequently include sudden loss of acceleration, unresponsive acceleration pedals, and unexpected limp mode activation while driving, often accompanied by dashboard warnings. These issues appear at varying mileages, with one traction battery failure occurring around 1,250 miles. Safety implications are noted, such as concerns over vehicle control during acceleration and braking, and one instance where a vehicle became undriveable and unable to be secured due to a dead 12V battery. Potential buyers should be aware of these recurring problems and the associated safety risks.

Owners of the 2025 Hyundai Ioniq-5 report issues with the vehicle's speed control, particularly with the i-Pedal mode and N e-Shift mode. In i-Pedal mode, multiple reports indicate that the vehicle fails to decelerate immediately when the accelerator is released, maintaining speed for several seconds before slowing down, which can increase the risk of rear-end collisions. With the N e-Shift mode, owners describe unintended acceleration for 1-2 seconds after releasing the throttle, especially during spirited driving, which could potentially lead to unsafe situations. These issues are noted shortly after acquiring the vehicle, with no warning lamps or messages accompanying the symptoms. Safety implications include reduced reaction time and increased cognitive load, which may lead to accidents if not addressed.

Owners of the 2025 Hyundai Ioniq-5 report several engine-related issues, with the most common being sudden power failures while driving at highway speeds, as described by multiple owners who experience a complete loss of power without warning lights. Another issue frequently mentioned is a surging or pulsing sensation at speeds of 60-65 mph, where the vehicle struggles to maintain a consistent speed. Additionally, there are reports of a loud screeching noise, potentially linked to a missing wave washer in the MGDU housing, although this seems to affect vehicles built within a specific timeframe. These problems often arise within the first few weeks of ownership, with some vehicles having as little as 500 miles on the odometer. Safety concerns are evident, particularly with the power failure incidents, as they occur unexpectedly on highways, posing a risk of accidents.

Owners report issues with the 2025 Hyundai Ioniq-5's Lane Keeping Assist (LKA) system, primarily when wearing prescription or dark sunglasses. Complaints frequently mention false warnings and alarms due to the vehicle's inability to detect the driver's eyes through sunglasses, which affects the functionality of the LKA system. This problem persists even when settings are adjusted to disable the warnings. Multiple owners describe the system as nearly unusable under these conditions, suggesting a design flaw that impacts the effectiveness of the safety feature. No specific mileage or timeline patterns are noted, but the issue is consistent across reports, with implications for driver safety due to distraction and potential loss of a key safety feature.

Owners of the 2025 Hyundai Ioniq 5 report issues with the vehicle's service brakes, specifically related to the Forward Attention Warning system and unintended acceleration. Complaints frequently mention that the Forward Attention Warning system gives false positives, resulting in distracting alerts and, in some cases, hard braking on the highway when the system fails to detect driver attention properly. Another issue noted by owners involves unintended acceleration when releasing the accelerator pedal, which persists for approximately three seconds before normal braking resumes. This problem is associated with a failure in the ABS module, with one report indicating this occurred at around 9,200 miles. These issues have significant safety implications, including the potential for loss of control, particularly at highway speeds.