Research · complaint index
Hyundai Ioniq Plug-in Hybrid years to avoidWhat NHTSA complaint data does and doesn’t say
We compared 5 model years of the Hyundai Ioniq Plug-in Hybrid by owner complaints to NHTSA, adjusted for how long each year has been on the road. 2021 stands out with at least twice the typical complaint rate.
Complaints per year on the road
1.0 = typical year for this model
| Year | Complaints | Per year on road | Index | Recalls | Crashes | Signal |
|---|---|---|---|---|---|---|
| 2022 | 3 | 1 | 0.7 | 0 | 0 | Typical |
| 2021 | 18 | 3 | 3.5 | 0 | 0 | Most complaints |
| 2020 | 6 | 1 | 1.0 | 0 | 2 | Typical |
| 2019 | 11 | 1 | 1.6 | 0 | 3 | Typical |
| 2018 | 4 | 0 | 0.5 | 1 | 0 | Typical |
- 20223 complaints · 0 recallsTypical
- 202118 complaints · 0 recallsMost complaints
- 20206 complaints · 0 recallsTypical
- 201911 complaints · 0 recallsTypical
- 20184 complaints · 1 recallTypical
Data from NHTSA Complaints & Recalls APIs · synced Nov 13, 2026
About this comparison
What Hyundai Ioniq Plug-in Hybrid years have the most complaints?
Adjusted for years on the road, 2021 drew at least twice the typical rate of NHTSA owner complaints among the 5 model years compared.
Is this a reliability rating?
No. These are counts of unverified owner complaints to NHTSA. They are not adjusted for how many cars were sold, so a popular year can collect more complaints. Use them to find patterns, then read the reports.
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.