Most common 2021 Kia Niro problems
Share of the 9 complaints; one complaint can involve more than one system. "~" is the median mileage when the problem started.
Kia Niro complaints by model year
Best Niro years: 2021. Years to avoid: 2023, 2025, 2022. Compare all years →
2021 Kia Niro recalls (1)
Power train › Automatic transmission › Internal › Clutches/bands › Actuators/solenoids
Kia America, Inc. (Kia) is recalling certain 2017-2022 Niro and 2018-2022 Niro Plug-in Hybrid vehicles. Fluid may leak into the printed circuit board inside the hydraulic clutch actuator, which can result in an engine compartment fire.
Remedy: Dealers will inspect and replace the hydraulic clutch actuator as necessary and install a new fuse, free of charge. Owner notification letters were mailed December 29, 2023.
NHTSA defect investigations
Federal safety investigators have looked into a possible defect involving the 2021 Kia Niro:
Pedestrian alert sounds
NHTSA received a petition on or about July 18, 2022, requesting that Federal Motor Vehicle Safety Standard (FMVSS) 141 be applied to all electric and hybrid vehicles operating in the United States. The petition can be reviewed at NHTSA.gov under ODI Number 11486072. FMVSS 141 establishes performance requirements for pedestrian alert sounds for motor vehicles.
What 2021 Kia Niro owners say
Transmission & drivetrain
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.
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.
2021 Kia Niro engines & fuel economy
| Engine | Transmission | Drive | MPG city / hwy / combined | Range |
|---|---|---|---|---|
| Electric | Single-speed | FWD | 123 / 102 / 112 MPGe | 239 mi |
| 1.6L 4-cyl hybrid | 6-speed dual-clutch | FWD | 53 / 48 / 50 | — |
| 1.6L 4-cyl plug-in hybrid | 6-speed dual-clutch | FWD | 48 / 44 / 46 | — |
EPA ratings. Class: Wagon.
Frequently asked questions
Is the 2021 Kia Niro a good car?
Based on 9 owner complaints filed with NHTSA, the 2021 Niro rates better than average: 52% fewer complaints than a typical year of the Niro at the same age. It is one of the best Niro years by this measure. Complaint counts don't account for sales volume or individual maintenance, so have any used car inspected before buying.
What is the most common problem with the 2021 Kia Niro?
The transmission & drivetrain — 3 complaints, 33% of all complaints for this model year. Next are the windows, wipers & sunroof (2) and electrical system (2).
How many recalls does the 2021 Kia Niro have?
There is 1 recall for the 2021 Kia Niro, the most recent from July 31, 2023 (actuators/solenoids). Recall repairs are free at any authorized dealer — check whether yours has been done with the VIN recall check.
What are the best and worst years of the Kia Niro?
The best years by complaints, compared at the same age, are 2021. Years to avoid or approach with caution: 2023, 2025 and 2022. See the full Kia Niro years comparison.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.