Hyundai's flagship 3-row electric SUV on the 800V E-GMP platform. The Performance AWD variant puts 320 kW (435 hp) through dual motors, accelerates to 100 km/h in 5.2 seconds, and delivers around 570 km WLTP range from its 110.3 kWh battery. At roughly 2,700 kg, it is one of the heaviest passenger EVs in Europe, which shows in tire and brake consumption. Ultra-fast DC charging (10-80% in about 24 minutes) and a spacious, lounge-like interior are its strongest selling points.· more· less
Buy if: You need a large, fast-charging 3-row electric SUV with strong range and Hyundai's 5-year warranty, and can keep up with consumable costs on a 2.7-ton vehicle.
Avoid if: You want a trouble-free ownership experience from a proven platform, or you need low consumable costs.
Price & maintenance
Used price
€78,000
median asking price, typically 5,000 km
Typical range€75,000 – €81,500
Maintenance cost
€750 – €1,400/year
at 15,000 km/year
Fixed costsservice, tyres, brakes€450 – €800 /yr
Risk bufferunplanned repairs€300 – €600 /yr
Price estimates are based on German asking prices. Prices and costs vary by vehicle condition and location.
Ownership costs
Maintenance assumes 15,000 km a year. Price estimates are based on German asking prices. Prices and costs vary by vehicle condition and location.
Silicon-carbide MOSFET in the DC-DC converter degrades over time, potentially disabling both charging and the 12V supply · more· less
The ICCU converts the high-voltage battery to 12V for vehicle systems and manages AC charging. On earlier E-GMP vehicles (2022-2024 Ioniq 5, EV6), failure rates of 2-10% were reported by Consumer Reports surveys. The root cause is a silicon-carbide MOSFET that degrades from repeated voltage transients during normal switching at around 300 kHz. When it fails, a 130-amp internal fuse blows, disconnecting the ICCU from the HV battery entirely. The 12V system then drains in 20-45 minutes, progressively disabling vehicle functions until the car is stranded. The Ioniq 9 uses a second-generation ICCU designed after the defect pattern emerged, and early data for 2025-2026 models is more encouraging, with no wave of complaints on the newer part. Hyundai has also extended ICCU warranty to 15 years / 300,000 km in Germany and several other European markets. Software recalls (SC271, SC302, SC327) added a soft-start mechanism to reduce transient severity. Out-of-warranty replacement costs are approximately 1,200-2,500 euros depending on the market.
12V auxiliary battery drain
€150 - 4002 of 6
12V battery depletes when parked for 7-14 days, leaving the car unable to start · more· less
A well-documented E-GMP platform characteristic. Background systems draw enough current to flatten the 12V battery within one to two weeks if the car is not driven or plugged in. Early models were worsened by third-party Bluelink apps polling the car thousands of times per day; Hyundai limited this to 20 requests per day in early 2023. On the Ioniq 9, the issue is improved but not eliminated. If the car sits for more than 10 days, the 12V battery may not have enough charge to wake the HV system. Mitigation: leave the car plugged into a Level 2 charger when parked for extended periods, or install a trickle charger on the 12V battery. Replacement of the AGM 12V battery costs approximately 150-250 euros, plus 50-150 euros for diagnostics if the underlying cause (ICCU beginning to fail, parasitic draw from a module) needs investigation.
ADAS false intervention and sensor calibration
€200 - 8003 of 6
Driver attention monitoring triggers false warnings, and forward collision assist brakes unexpectedly in normal traffic · more· less
Multiple Ioniq 9 owners report the driver attention warning system incorrectly flagging inattentive driving, particularly when wearing glasses in sunny conditions. The system can escalate to autonomous emergency braking, stopping the car unexpectedly in traffic. Forward collision assist has also been reported to brake for phantom obstacles in light or moderate traffic. These issues are addressable through software updates and sensor recalibration, but recalibration after a windshield replacement can cost 400-800 euros at a dealer. The driver attention warning can be partially disabled in settings, though it re-enables when driver assistance features are active.
Heat pump malfunction in cold weather
€800 - 2,0004 of 6
Heat pump efficiency drops significantly below -10 degrees C, forcing reliance on resistive PTC heater and reducing range by 30-40% · more· less
The Ioniq 9's heat pump is designed more for maintaining cabin temperature than for initial warm-up in extreme cold. Below -10 degrees C the heat pump becomes minimally effective, and the car falls back to PTC resistive heating, which draws significantly more energy and reduces range by 30-40%. While this is partly by design, actual heat pump component failures have been reported on earlier E-GMP models, requiring refrigerant recharge or compressor replacement. On the AWD Performance model, the heat pump system also manages battery thermal conditioning for fast charging. A compressor failure costs approximately 800-1,500 euros for parts plus 500 euros labor at a Hyundai dealer. Preconditioning the cabin while plugged in significantly reduces the impact.
Infotainment system freezes and software bugs
€0 - 3005 of 6
Touchscreen occasionally freezes or reboots during driving, requiring a manual reset · more· less
The ccNC infotainment platform used in the Ioniq 9 has shown occasional freezing, unresponsive touch inputs, and spontaneous reboots. Profile management can be problematic, with the system failing to recognize the correct driver profile on entry. Over-the-air updates have bricked infotainment systems on some E-GMP vehicles (notably the Ioniq 6 in 2024). Most issues resolve with a system reset or a dealer software reflash at no cost under warranty. Out of warranty, a dealer software update typically costs 100-300 euros. The underlying hardware is rarely at fault.
Front electric motor bearing wear (AWD models)
€1,500 - 3,5006 of 6
Needle bearing in the front reduction gear can develop whining noise under load, typically above 60,000 km · more· less
Early Ioniq 5 AWD models (2021 to mid-2022) experienced front motor bearing wear caused by inadequate oil flow to the reduction gear housing. Symptoms include whining or grinding under acceleration and vibration between 60-100 km/h. Hyundai issued TSB 22-EV-007 and revised the bearing cage design and oil jet targeting from Q3 2022 onward. The Ioniq 9, being a 2025 model, benefits from these revisions. However, the Performance AWD variant puts higher loads through both motors, and at 2,700 kg the front motor works harder than in the lighter Ioniq 5. If a bearing failure occurs, the motor assembly typically needs replacement at 1,500-3,500 euros including labor, depending on whether the complete drive unit or individual components are replaced. This is covered under Hyundai's 5-year powertrain warranty for the original owner.
First-generation product with known platform concerns, but improving
The Ioniq 9 Performance AWD inherits the E-GMP platform's ICCU and 12V battery concerns, though the second-generation ICCU used in 2025+ models shows improved reliability compared to earlier variants. Hyundai's 15-year ICCU warranty extension in several European markets provides significant protection. As a brand-new model, long-term data is still limited. The main financial risks come from the car's sheer weight and large tire size, which drive up consumable costs compared to smaller EVs on the same platform.
Service history
Verify complete Hyundai dealer records. Check that all software updates and recall campaigns have been applied.
Tires
Check tread depth, date codes, and uneven wear. At 2,700 kg, the Ioniq 9 wears tires faster than lighter EVs. Verify correct 275/50R20 EV-rated tires are fitted.
Test drive
Drive for at least 30 minutes including highway speeds. Test regenerative braking in all modes. Listen for any drivetrain whining.
Charging test
Test both AC and DC charging if possible. AC charging failures are the first symptom of ICCU degradation.
Specific for this vehicle
Test AC charging (Level 2) for at least 15 minutes
Plug into a Level 2 charger and verify it ramps up and holds steady. If charging stops or drops to a low rate, this may indicate early ICCU degradation.
Check 12V battery voltage and age
If the car has been sitting on a dealer lot for weeks, the 12V battery may already be degraded. Voltage should be above 12.4V with the car off. Ask when the 12V battery was last replaced or charged.
Verify ICCU recall and software updates applied
Contact Hyundai with the VIN to confirm all recall campaigns (SC271, SC302, SC327) and the latest software version are installed. The second-gen ICCU in the Ioniq 9 should have these from factory, but verify.
+ 3 more checksShow less
Test all ADAS systems during the drive
Enable adaptive cruise control and lane keep assist on the highway. Watch for false collision warnings or unexpected braking events. Test the driver attention system.
Inspect rear suspension for noise or play
Drive over speed bumps and uneven surfaces. Listen for clunking or abnormal noises from the rear axle, which could indicate loose fasteners (subject of a US recall on Georgia-built cars).
Check battery state of health in on-board diagnostics
Navigate to the battery health display in the vehicle settings. A new or near-new car should show 95-100% state of health. Anything below 90% on a car with under 50,000 km warrants investigation.
Recalls and Technical Service Bulletins
High-voltage battery bus bar insufficiently tightened (US-assembled vehicles, Jan-Sep 2025)Verify if applicable
Rear suspension fasteners may loosen (US-assembled vehicles, Mar-Jul 2025)Verify if applicable
ICCU software update campaigns (SC271, SC302, SC327, applies to all E-GMP vehicles)Verify completed
The two hardware recalls (battery bus bar, rear suspension) primarily affect US-assembled vehicles from the Georgia Metaplant. European Ioniq 9 units are assembled at Hyundai's Asan plant in South Korea. Contact Hyundai with the VIN to verify which assembly plant produced your specific car and whether any recalls apply.
Warranty Status
Factory warranty (5 years, unlimited km)Applies to most used Ioniq 9 units (production started 2025)
High-voltage battery warranty (8 years / 160,000 km)Covers battery capacity above 70% state of health
ICCU extended warranty (15 years / 300,000 km)Available in Germany, UK, Finland, Ireland; other EU markets expected
Electric motor and inverter warrantyCovered under 5-year factory warranty; check transferability to second owner
Hyundai offers one of the strongest warranty packages for EVs in Europe. The 5-year unlimited mileage factory warranty covers most components, and the high-voltage battery is covered for 8 years / 160,000 km. The separate 15-year ICCU warranty extension in several EU markets specifically addresses the platform's most concerning failure mode. Verify with Hyundai that all warranty coverage transfers to subsequent owners.
Sources: Research draws on model-specific owner forums and owner communities, recall information from official authorities, German automotive press, and multiple workshop cost references cross-checked against each other.
This report is for informational purposes only and does not constitute professional advice. Estimates may be inaccurate. Always have a qualified specialist inspect the vehicle before purchase. We accept no liability for decisions made based on this information.
