2025 Hyundai Ioniq 5 N Problems: 8 Known Issues

How to Fix

Check your VIN at nhtsa.gov/recalls for any open campaign; the 2025 Ioniq 5 N is not part of ICCU recall 24V-868, so an ICCU failure on this car is handled as a no-cost repair under Hyundai's 5-year/60,000-mile New Vehicle Limited Warranty. Be aware that replacement ICCU parts have been backordered 2+ months at many dealers. If the 12V battery drains, the vehicle can sometimes be jump-started to reach the dealer, but drive directly there without stopping. After the ICCU replacement, Hyundai recommends not leaving the vehicle unplugged for extended periods. If the ICCU fails again after a replacement, inform the dealer that Hyundai has acknowledged repeat failures on remedied E-GMP vehicles and a second replacement may be needed.

Owner tips & cautions

• TipInstall a 12V battery monitor (like the Battery Minder or FIXD sensor) to get early warning of ICCU failure. When the ICCU starts failing, it stops maintaining the 12V battery, and a monitor will alert you to abnormal voltage drops before the vehicle becomes undrivable.
• TipIf the dealer says ICCU parts are backordered, request a loaner vehicle. Hyundai's recall policy requires providing alternate transportation when safety recall parts are unavailable.

How to Fix

If the vehicle will sit for more than 3-4 days, either keep it plugged into a Level 1 or Level 2 charger (which maintains the 12V battery) or connect a 12V battery tender to the auxiliary battery. The 12V battery is located under the hood (front trunk area). Remove any unauthorized third-party apps linked to your Bluelink account and change your Bluelink password, as Hyundai traced Ioniq 5 12V drain to third-party apps waking the car too often. Replace the 12V battery proactively every 2-3 years with a high-quality AGM battery ($150-$250). After a dead 12V battery jump-start, drive for at least 30 minutes to allow the DC/DC converter to fully recharge the 12V system.

Owner tips & cautions

• TipThe simplest prevention is to leave the car plugged in when not driving. Even a standard 120V Level 1 outlet is enough to keep the 12V battery maintained. If that is not possible, a NOCO Genius1 battery maintainer connected to the 12V battery terminals under the hood prevents dead battery surprises.

How to Fix

For a frozen or static screen, force a head-unit reset: on 2022-2024 cars a paperclip in the pinhole beside the physical controls at the right of the screen reboots it; owners report the pinhole reset does not work on 2025 cars, which need a brief 12V negative-terminal disconnect instead. For Bluelink, delete and re-add the vehicle in the app and have the dealer check for a telematics unit software update - Hyundai has issued bulletins covering connectivity interruptions. Persistent static-screen cases warrant head unit software reflash or replacement under the 5-year/60,000-mile New Vehicle Limited Warranty.

How to Fix

Apply the recall 25V-235 IEB software update (OTA or dealer, free). Hyundai's interim instruction was to leave LFB switched off entirely until the reflash was done. If the pedal has felt long, also have the dealer verify brake fluid condition and bleed the system - track-heat-cycled fluid on this car boils faster than owners expect.

How to Fix

Light surface rust on brake discs is normal for EVs with strong regenerative braking and will clear within a few brake applications. For the regen-to-friction transition clunk, visit the dealer for a brake system inspection — the rear caliper mounting hardware or anti-rattle clips may need adjustment ($0-$200). Periodically use moderate friction braking (pressing the brake pedal firmly at lower speeds) to keep the disc surfaces clean and prevent excessive rust buildup. In N mode, the virtual gear shifting feature engages strong regen which reduces friction brake use — balance this with occasional conventional braking. If disc rust is severe, the dealer can resurface or replace the rotors ($200-$400 per axle).

Owner tips & cautions

• TipOnce a week, make a few moderate-to-firm brake applications at 30-40 mph to scrub the disc surfaces clean. This prevents the rust buildup that causes scary-sounding scraping on your first stop. It only takes a minute and keeps the brakes in good shape.

How to Fix

Have the VCU (and Integrated Electronic Brake) software reflashed under recall 25V-235 - delivered over-the-air or by a Hyundai dealer at no charge. Vehicles already updated under the earlier 25V-065 campaign must be re-flashed with the newer remedy; the first fix did not fully resolve it. Until the update is applied, do not use N e-Shift.

How to Fix

Visit a Hyundai dealer and have the technician road-test the vehicle at highway speed to verify the motor noise. The dealer should compare the noise level against Hyundai's specifications. If the noise exceeds specifications, the front drive unit may need replacement under warranty. Turning on the N Active Sound+ system at a moderate volume masks the motor whine during spirited driving. Adding sound-deadening material to the wheel wells and firewall ($100-$300 DIY, $500-$800 professionally installed) can also reduce the perceived noise level. Note that some motor whine is inherent to the high-output motors and may not be fully eliminable.

Owner tips & cautions

• TipBefore spending money on sound deadening, try the N Active Sound+ system on the 'Ignition' setting at volume 3-4. Many owners find this provides enough auditory feedback to make the motor whine unnoticeable, while also giving the car a more engaging driving character.

How to Fix

Start with the TSB: adjust the tailgate's rubber overslam bumpers and the tailgate-to-body gap per 24-BD-012H, which cures the majority of cases. If the noise persists, buckle the rear seatbelts into their latches to stop the buckle tongues tapping the trim, and add felt tape behind the rear seatbelt guide and the B-pillar height-adjuster cover. Check the cargo-floor board and the tire-repair kit/undertray for loose contents before disassembling trim.