VehicleVerdict

2018 Kia Niro problems

Verdict · NHTSA data

One of the years to avoid

With 79 complaints filed to NHTSA — about 1.7 times the median Niro year — the 2018 model ranks #3 of 9 Niro years for complaint volume. It lands on the years-to-avoid list.

No single system dominates the record — complaints spread across engine (17), electrical system (17), and transmission (16), which usually points to general build quality rather than one defect.

79

NHTSA complaints

3

Recalls

1

Investigations

6

Crash-involved

0

Fires reported

6

Injuries

0

Deaths

—

NCAP overall

How does 2018 compare to other Niro years?

Niro NHTSA complaints by model year, 2018 highlighted109 complaints2017: 109 complaints2018: 79 complaints2019: 83 complaints2020: 48 complaints2021: 12 complaints2022: 40 complaints2023: 65 complaints2024: 13 complaints2025: 19 complaints
Niro NHTSA complaints by model year, 2018 highlighted. Red bars are years to avoid.

See all Niro years to avoid →

What are the most common 2018 Kia Niro problems?

ComponentComplaintsShare
Engine1722%
Electrical System1722%
Transmission1620%
Other1013%
Brakes68%
Speed Control45%
Body & Structure34%
Lighting23%
Fuel System23%
Seats11%
Airbags11%

Does the 2018 Kia Niro have recalls?

3 NHTSA recall campaigns on file. Recall repairs are free at franchised dealers.

23V534000TransmissionJuly 31, 2023 · 121,411 units

Defect

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.

Consequence

A fire increases the risk of injury.

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. Owners may contact Kia customer service at 1-800-333-4542. Kia's number for this recall is SC276.

22V836000Fuel SystemNovember 11, 2022 · 27,030 units

Defect

Kia Motors America (Kia) is recalling certain 2017-2018 Kia Niro hybrid electric vehicles previously recalled under recall 18V-666. The Main Relay within the Power Relay Assembly (PRA) may have inadequate connections between its contacts, causing increased electrical resistance, which can overheat the rear seats.

Consequence

Overheated rear seats increase the risk of a fire.

Remedy

Dealers will inspect the PRA and replace either the PRA or the Main Relay, as necessary, free of charge. Owner notification letters were mailed January 9, 2023. Owners may contact Kia customer service at 1-800-333-4542. Kia's number for this recall is SC256. This recall supersedes NHTSA recall number 18V-666. Vehicles already repaired under the previous recall will need to have the new remedy completed.

18V666000Fuel SystemSeptember 25, 2018 · 27,030 units

Defect

Kia Motors America (Kia) is recalling certain 2017-2018 Kia Niro hybrid electric vehicles. The Main Relay within the Power Relay Assembly (PRA) may have inadequate connections between its contacts, causing increased electrical resistance.

Consequence

The increased electrical resistance can overheat the rear seat which is above the PRA, increasing the risk of a fire.

Remedy

Kia will notify owners, and dealers will inspect the Power Relay Assembly (PRA) for damage. If no damage is found, the main relay will be replaced. If damage is found, the PRA will be replaced. These repairs will be performed free of charge. The recall began November 23, 2018. Owners may contact Kia customer service at 1-800-333-4542. Kia's number for this recall is SC168.

Consumer complaints filed with NHTSA

Representative excerpts, cleaned of personal information. These are consumer statements, not verified defects.

“On 2/15/2022 around 10:00AM, I was driving my vehicle as normal. Noticed brake lights ahead, I was about 3 car lengths back, which I always try to drive since I am on the road a lot and I prefer not to have an accident. Well this time, I put my foot on the brake as normal and the vehicle felt like…”

Complaint filed with NHTSA · Electrical System · February 15, 2022 · crash

“Internal combustion engine coolant leaking out exhaust. The heat exchanger located in the catalytic converter system is leaking, leading to the ICE coolant draining. This leads to the engine overheating, and damage. Signs of the issue started with the coolant level lowering quickly, then the car…”

Complaint filed with NHTSA · Engine · October 30, 2024

“The contact owns a 2018 Kia Niro. The contact received notification of NHTSA Campaign Number: 23V534000 (Power Train) however, the part to do the recall repair was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The…”

Complaint filed with NHTSA · Transmission · January 19, 2024

“PURCHASED THE VEHICLE WITH SAFETY TECH PACKAGE WHICH INCLUDES AEB (AUTO EMERGENCY BRAKING) AND VEHICLE DID NOT STOP EVEN WHEN I APPLIED FULL BRAKES TO PREVENT A COLLISION. THE MAIN REASON I PURCHASED THIS VEHICLE WAS FOR THIS SAFETY FEATURE.”

Complaint filed with NHTSA · Other · May 30, 2018 · crash

“I'm 59 years old never have an accident or had to slam breaks on the guy in front of me slammed his breaks on so I did the same time the brake pedal was to the floor the car didn't even slowed down and not even skid marks hit him then air bags deployed the car was totaled no one got hurt thank God…”

Complaint filed with NHTSA · Brakes · April 27, 2025 · crash

2018 Kia Niro — common questions

Is the 2018 Kia Niro reliable?

NHTSA data argues against it: 79 complaints put the 2018 model at #3 of 9 Niro years. It is one of the Niro years to avoid.

What are the most common 2018 Niro problems?

According to NHTSA complaint data, the leading problem areas are engine (17 complaints), electrical system (17 complaints), transmission (16 complaints).

Does the 2018 Kia Niro have recalls?

Yes — NHTSA lists 3 recall campaigns affecting the 2018 Kia Niro. Recall repairs are free at franchised dealers; check the VIN at nhtsa.gov/recalls to confirm the work was done.

Is the 2018 Kia Niro under NHTSA investigation?

NHTSA opened one investigation into this model year; all are now closed.

Which Kia Niro years should you avoid?

Based on complaint rates and open investigations, the Niro years to avoid are 2017, 2019, 2018. The cleanest record among Niro years belongs to 2021.

Related

Based on NHTSA ODI data through June 2026. Complaints are consumer-reported and unverified. Updated July 5, 2026.

Compiled by Sharon Ben-Moshe, Founder.