Ioniq (2026)
Reliability Score
Complaints by Engine Code
Every complaint of any kind (brakes, airbags, electrical and the rest) whose VIN names the engine, across all model years. The score above counts only engine, transmission and drivetrain complaints, so its figures for the same engine are smaller. Fire, injury and death figures count complaints that report one.
Hyundai Ioniq Unidentified Engine
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Complaint Breakdown
Battery & Propulsion Reliability
Battery Electric (BEV)
Battery & propulsion complaint analysis for the 2026 Hyundai Ioniq
Too few battery-related complaints to set against other electric vehicles yet.
What kind of battery complaint?
What the 7 battery-related complaints describe. One complaint can name more than one of these, so the shares add up to more than 100%. They describe what owners complained about, not how often the vehicle fails.
Loss of power, drive unit, inverter, traction motor, DC-DC converter.
Low-voltage battery deaths, common on EVs and hybrids that use a 12V for accessories.
Propulsion battery defects, capacity loss, BMS faults, replacement claims.
Charge port, cable, mobile connector, or session failures.
Sample complaint excerpts
Electric Propulsion
- [2026] I am reporting serious repeated safety failures with my 2026 Hyundai IONIQ 9 involving unintended emergency braking and sudden loss of propulsion. While traveling approximately 70–75 mph northbound on I-15, the vehicle suddenly displayed an emergency braking warning and aggressively slowed despite no apparent obstacle or traffic condition requiring emergency braking. Before I could regain control,
- [2026] On 8/3/26 my Ioniq 9 had a warning message to Check the Electrical System, but provided no additional information. I was able to drive the car home, anticipating that I be able to take it in to the Hyundai dealer where i purchased the vehicle. It should be noted that the car went into limp mode (max 25 mph) for the final six miles to my home. I researched the issue on line and determined that i
- [2026] An Integrated Charging Control Unit (ICCU) failure halts the vehicle’s ability to charge and power the 12-volt battery. When it fails, the car can no longer keep the 12V battery charged. This drains the 12V system, potentially causing a sudden loss of motive power while driving or a "bricked" car that won't start. The presents a safety problem because it happened while I was driving and the car sl
12V Auxiliary Battery
- [2026] My ICCU failed, which caused a fuse to blow and some electrical wiring in the car to melt. This caused the car to completely deplete the 12V battery, which left the car completely inoperable. The vehicle was towed to a Hyundai dealership, where they ordered the relevant parts and changed them under warranty. I was without the car for roughly two weeks.
High-Voltage Battery
- [2026] On XXX, my 2025 Hyundai Ioniq 9 displayed a battery fault warning (DTC P1AAF00). I was instructed by Hyundai to bring the vehicle to a dealership immediately as other Ioniq 9 owners had experienced sudden and complete loss of motive power during highway operation. The vehicle has been at Pacifico Hyundai in [XXX] since that date. I was initially told the battery control module required replacement
Source: classified from NHTSA complaint and recall data. "Battery-related" includes high-voltage propulsion battery, charging system, hybrid drivetrain, electric propulsion, regenerative braking, 12V auxiliary battery, and thermal-event complaints. Other complaints (suspension, steering, brakes, infotainment) appear in the engine and vehicle-level sections. The rate divides those complaints by the electrified versions built, from the production counts makers report to NHTSA, and it is not adjusted for age. Death and injury figures count complaints that report one, not the number an owner typed in.
Owner Complaints by System
Complaints owners filed with NHTSA about the Hyundai Ioniq, counted across every engine. A complaint can name more than one system.
NHTSA Safety Ratings About NHTSA ratings
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Frequently Asked Questions
What are the most common 2026-2026 Hyundai Ioniq complaints?
Owners have filed 37 complaints with NHTSA about the 2026-2026 Hyundai Ioniq. The systems they name most often are the electrical system, the fuel system and the safety systems.
Is the 2026-2026 Hyundai Ioniq a good used car?
That depends on the model year, the mileage and the maintenance history of the car in front of you. Owners have filed 37 complaints with NHTSA about the 2026-2026 Hyundai Ioniq. Check which systems they name most often and whether a recall is still open on that car.
How many NHTSA complaints does the 2026-2026 Hyundai Ioniq have?
NHTSA has 37 owner complaints on file for the 2026-2026 Hyundai Ioniq as of the latest data pull. A complaint is an owner's report, not a confirmed defect, and counts rise with sales.
What recalls affect the 2026-2026 Hyundai Ioniq?
NHTSA lists no recalls for the 2026-2026 Hyundai Ioniq.
What should I check before buying a used Hyundai Ioniq?
Run the VIN through NHTSA's recall lookup and confirm every open recall has been done. Look hardest at the electrical system, the fuel system and the safety systems, the systems owners complain about most. Ask for maintenance records, have an independent mechanic inspect the car and run a vehicle history report for prior accidents and title issues.
What are the NHTSA crash test ratings for the Ioniq?
The 2026 Hyundai Ioniq received an overall 5-star safety rating from NHTSA. Frontal crash: 5 stars. Side crash: 5 stars. Rollover: 5 stars (9.9% rollover probability). Electronic Stability Control: Standard. Forward Collision Warning: No. Lane Departure Warning: No. These ratings are based on standardized crash tests conducted by the National Highway Traffic Safety Administration.
Data from NHTSA federal complaints database. 37 complaints analyzed. Data confidence: moderate. Last updated: 2026-10-18.