Problems · NHTSA complaints
2021 Kia Niro problems
Owners filed 11 complaints about the 2021 Kia Niro with NHTSA between Jul 2021 and Apr 2026. The most-cited component is power train (3).
Complaints
11
Filed with NHTSA
Crashes
1
Reported by owners
Fires
0
Reported by owners
Injuries
1
People reported injured
Deaths
0
Reported to NHTSA
Complaints by component
One complaint can cite several components
- Power train3
- Engine2
- Electrical system2
- Service brakes1
- Vehicle speed control1
- Visibility1
- Back over prevention1
- Visibility/wiper1
- Other / unknown2
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 Oct 30, 2026NHTSA vehicle page
When complaints were filed
Does it get worse with age? Complaints per calendar year filed
2
1
2
2
1
3
View as table
| Model year | Complaints filed per calendar year |
|---|---|
| 2021 | 2 |
| 2022 | 1 |
| 2023 | 2 |
| 2024 | 2 |
| 2025 | 1 |
| 2026 | 3 |
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.
Top problems in owners’ words
Verbatim from NHTSA complaints, newest first
Power train
3 reports1 related recall
“This is a hybrid vehicle. It has Dual clutch transmission. Since I have owned it, intermittently the clutch does not disengage completely. This causes the vehicle to try to pull ahead but my foot is on the brake. The vehicle does not stall. Somehow it figures out it can't pull ahead and somehow fully releases. I have brought it to kia at least 3 times. In each case they tell me they cNt get the car to fail and since there are no codes produced they can't fix it. They even held onto the car several days. I asked them to please replace SOMETHING but the say Kia policy will not allow them to do that. So I am stuck with a car that keeps misbehaving. It is embarrassing because problems occur while a passenger is in the car and it seems to them that I am not driving correctly. I don't know what to do.”
Engine
2 reports
“EV motor and drive train have a clattering noise, much like a playing card attached to a bicycle clattering against the wheel spokes. it speeds up and slows down with the acceleration of the motor.”
Electrical system
2 reports
“I received important safety recall letter for NHTSA recall # 23V534. the HCA & or Fuse might need to be replaced . I brought the 2021 Nero to my local Kia dealership, Eagle kia ,Riverhead NY on January 18th. The dealership still has the vehicle & claims that a code came up when they did the diagnostics That requires a part that must be secured to complete the fix for the recall. they claim they are awaiting approval from kia corporate & NHTSA to add to the technical bulletin. But their is no timeframe they have or when this additional part will be available. The dealership has the fuses & Harness for the HCA replacement, but needs this additional part. I asked what the # of this part is or name, but all they would tell me TBT.”
Service brakes
1 report
“The rear brake rotors on the vehicle are pitted, as confirmed by a local repair shop. The "incident" is ongoing. Kia refuses to repair or replace them under warranty (25,500 miles on the car), claiming they are wear item. However, pitting is not wear, in fact quite the opposite. My analysis (30+ yrs in the auto business): As an EV, regenerative braking means the actual brake systems are rarely used. Noise at low speeds prompted the inspection at a local shop. Braking under high speeds does not result in noise, telling me the system relies too heavily on the front brakes. The result is the rear rotors are too often unused leaving them to rust and then pit. Tesla recognizes that regen braking can actually harm brake rotors, suggesting burnishing the brakes at times using the following procedure: 1) Drive the vehicle at approximately 50 mph - 55 mph (80 km/h - 90 km/h) on a straight road. 2) Apply moderate, consistent pressure to the brake pedal to slowly decelerate the vehicle, releasing at 10 mph (15 km/h). 3) Repeat this procedure 6 times, waiting at least 30 seconds between applications. Since the rear brakes do not appear to engage on the Kia Niro, this…”
Vehicle speed control
1 report1 crash
“I was backing out of a tandem parking spot in a private garage and got too close to a pillar, and tried to pull forward into the spot. It felt like the car got snagged on the pillar, but while pulling forward slowly, the gas pedal snapped off and the car accelerated quickly and uncontrollably. I was able to avoid hitting other cars but drove straight into a concrete wall despite immediately braking. I'm relatively uninjured, but if it had happened in a less controlled environment and/or I hadn't reacted as quickly, there could have been serious injuries to myself or others. There was no indication of an issue prior, and the car is currently in storage with my insurance company and will be appraised next week. I have photos of the broken pedal.”
Visibility
1 report
“While driving on a major highway, my sunroof suddenly exploded. Luckily the screen was pulled shut otherwise I would have been covered in glass. I was able to drive to the next exit and park the vehicle to then get out and observe the damage. There was a gaping hole in the sunroof. I called a tow who brought me to a Kia dealership. I explained what happened and after inspecting the car the dealership told me it was road debris that caused the issue. I did not see or hear anything hit my car prior to the explosion of the sunroof and I question their findings that it was debris related.”
Data from NHTSA Complaints API (owner reports, unverified) · synced Oct 30, 2026
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.