Hyundai Ioniq Plug-In Hybrid vs KIA K4
Both cars' complete complaint records, side by side.
Read the totals carefully. NHTSA publishes no sales figures, so the car that sold more collects more complaints regardless of quality. The rows worth weighing are the proportions — the share of complaints that involved harm, and which part dominates.
| Measure | Hyundai Ioniq Plug-In Hybrid | KIA K4 |
|---|---|---|
| Complaints on file | 41 | 101 |
| Model years covered | 2018–2022 | 2025–2026 |
| Worst model year | — | — |
| Best model year | — | — |
| Crashes reported | 9 | 25 |
| Fires reported | 1 | 0 |
| Injuries reported | 5 | 16 |
| Deaths reported | 0 | 0 |
| Most complained-about part | Electrical System | Driver Assist & Collision Avoidance |
| Share of complaints involving harm | 36.6% | 40.6% |
Hyundai Ioniq Plug-In Hybrid by year
What breaks
Electrical System
7
17.1%
Transmission & Drivetrain
5
12.2%
Brakes
4
9.8%
Acceleration & Cruise Control
4
9.8%
Driver Assist & Collision Avoidance
4
9.8%
Other & Unspecified
4
9.8%
Body & Structure
3
7.3%
Seat Belts
3
7.3%
KIA K4 by year
What breaks
Driver Assist & Collision Avoidance
28
27.7%
Other & Unspecified
14
13.9%
Electrical System
13
12.9%
Engine & Cooling
9
8.9%
Steering
8
7.9%
Transmission & Drivetrain
7
6.9%
Airbags
6
5.9%
Acceleration & Cruise Control
5
5.0%