Problems · NHTSA complaints

2021 Hyundai Ioniq Hybrid problems

Owners filed 13 complaints about the 2021 Hyundai Ioniq Hybrid with NHTSA between Oct 2021 and May 2025. The most-cited component is electrical system (7).

Complaints
13
Filed with NHTSA
Crashes
0
Reported by owners
Fires
0
Reported by owners
Injuries
0
People reported injured
Deaths
0
Reported to NHTSA
01 —By component

Complaints by component

One complaint can cite several components
  1. Electrical system7
  2. Service brakes3
  3. Forward collision avoidance3
  4. Vehicle speed control2
  5. Engine1
  6. Back over prevention1
  7. Other / unknown3

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.

Data from NHTSA Complaints API · synced Nov 10, 2026NHTSA vehicle page
02 —Trend

When complaints were filed

Does it get worse with age? Complaints per calendar year filed
View as table
Model yearComplaints filed per calendar year
20212
20226
20232
20242
20251

Mileage at failure isn’t a structured field in NHTSA complaint data, so we don’t chart it. Some owners mention it in their reports below.

03 —Owner reports

Top problems in owners’ words

Verbatim from NHTSA complaints, newest first

Electrical system

7 reports
“The contact owns a 2021 Hyundai Ioniq Hybrid. The contact stated that while driving at various highway speeds, the electronic parking brake and auto hold indicator lights erroneously activated. The cause of the failure was not yet determined. The local dealer was notified of the failure, but no assistance was offered. The manufacturer was not yet contacted. The VIN was not available. The failure mileage was 16,000.”
Owner complaint to NHTSAFiled Aug 30, 2023Electrical systemODI 11541595

Service brakes

3 reports
“Auto brake fault has been a constant issue with this 2021 Hyundai Ioniq Hybrid. This causes lots of system functions to stop working (adaptive crusice control, lane keeping assistant, etc.) The dealer originally replaced the wiring harness, but it came back again and again with the same issue. They finally figured out that replacing the rear calipers seemed to make it stop. They have done that twice and this past weekend the fault warning appeared again. So, for the 4th time, we will be taking the car back in so this error goes away. For additional details, I will give you the most recent time, but note that the other 3 times all happened with in the first 1-3 years of ownership.”
Owner complaint to NHTSAFiled Oct 6, 2024Service brakesODI 11618338

Forward collision avoidance

3 reports
“I’m driving with cruise control on the highway at 65 and all of a sudden it shuts off. The check cruise system light comes on along with a triangle with an exclamation point in the middle of it in the lower left side of dashboard and the letters EPB lights up on the lower right side of dashboard.”
Owner complaint to NHTSAFiled Aug 6, 2023Electrical system, Vehicle speed control, Forward collision avoidanceODI 11536725

Vehicle speed control

2 reports
“Two different scenarios with this cruise control are problems with this vehicle. When it is raining the system with the cruise control does not work and the shop told me it happens with other vehicles. A warning light appears when this happens. This last time it was not raining and the cruise control quit working and the warning light came on as well as another system warning light. I showed the picture to the guy at the shop and he said after I showed him the picture he knew what to do, he had to reset the system. Yes, it’s available for inspection. When you’re driving in traffic on the highway going 65 and the car slows down for no apparent reason, that is a problem. The vehicle has not been inspected.”
Owner complaint to NHTSAFiled May 25, 2022Electrical system, Vehicle speed control, Forward collision avoidanceODI 11466017

Engine

1 report
“The contact owns a 2021 Hyundai Ioniq Hybrid. The contact stated that upon depressing the accelerator pedal, there was an abnormal ratting sound coming from the vehicle, and the vehicle failed to accelerate as needed. The contact stated that the check engine and oil warning lights were illuminated on the instrument panel. The vehicle was taken to a dealer where the vehicle was diagnosed with connecting rod bearing failure. The contact was then provided an estimate for an engine replacement. The manufacturer was also notified of the failure and the contact was provided a case number. The vehicle remained in the possession of the dealer and was not yet repaired. The failure mileage was 73,020.”
Owner complaint to NHTSAFiled May 8, 2025EngineODI 11659724

Back over prevention

1 report
“The backup mirror remained on while driving down the road.”
Owner complaint to NHTSAFiled Aug 22, 2022Back over preventionODI 11480586
Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 10, 2026

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.