"How reliable is the 2018 Kia Niro?"

"Based on 71 NHTSA complaints, the 2018 Kia Niro has a median complaint mileage of 4230 miles. The most common issue is Engine."

"What are common problems with the 2018 Kia Niro?"

"The most frequently reported component in NHTSA complaints for the 2018 Kia Niro is Engine, accounting for a significant portion of the 71 total complaints filed."

2018 Kia Niro: Reliability Data

Source: NHTSA — 71 complaints

Total Complaints

4,230mi

Median Mileage

Engine

Top Issue

Crash Reports

When Do Complaints Happen?

Distribution of NHTSA complaints by vehicle mileage at time of report.

250 25th Percentile

4,230 Median Mileage

91,000 75th Percentile

What Fails?

Most reported component issues from NHTSA complaints.

Engine

Electrical System

Power Train

Unknown Or Other

Service Brakes

Body

Vehicle Speed Control

Exterior Lighting

Fuel/Propulsion System

Engine And Engine Cooling

Severity Assessment

Crashes

Fires

Injuries

Deaths

Sample Complaint Reports

"ENGINE/TRANSMISSION BECOMES VERY SLUGGISH AS TEMPERATURES DROP AND THE TRANSMISSION SEEMS TO BE "ENGINE BRAKING" THE VEHICLE, MAKING COASTING NEARLY IMPOSSIBLE. PUTTING THE VEHICLE IN NEUTRAL ALLOWED THE CAR TO NORMALLY COAST BUT ONCE BACK IN DRIVE, ACCELERATION WAS TAXING. THE VEHICLE LACKS ANY POW..."

"WIRING HARNESS CHEWED UP BY RODENTS 6 WEEKS AFTER BUYING CAR NEW. ONLY 1900 MILES ON CAR. CAR WAS PARKED BETWEEN '01 TOYOTA TACOMA AND '04 F250 DIESEL, WHICH HAVE BEEN THERE SINCE NEW WITHOUT PROBLEMS, AS WAS A '06 VW DIESEL, AND A '12 VW DIESEL, ALSO PARKED THERE SINCE NEW. THE USE OF SOY BASED IN..."

"I AM WRITING TO YOUR COMPANY IN REGARDS TO A SERIOUS ACCIDENT WHICH HAPPENED ON THE DATE OF SATURDAY, MARCH 24TH AROUND 4PM EST. THIS ACCIDENT INVOLVED MY FAMILY AND I DRIVING THE NEW KIA NIRO HYBRID EX W/ TECH PKG WE PURCHASED FROM SANSONE DEALERSHIP ON NOVEMBER 24TH, 2017. MY VEHICLE WAS INVOLVED ..."

Source: NHTSA ODI Complaints Database. Names and identifying details omitted.

When Were Complaints Filed?

Number of complaints by the year the issue occurred.

When Does Each Component Fail?

Median mileage at complaint for top components.

Engine 15 complaints

25th: 3,175 mi Median: 62,115 mi 75th: 125,000 mi

Electrical System 15 complaints

25th: 250 mi Median: 1,927 mi 75th: 140,000 mi

Power Train 14 complaints

25th: 36,002 mi Median: 69,500 mi 75th: 102,415 mi

Unknown Or Other 8 complaints

25th: 745 mi Median: 1,355 mi 75th: 3,775 mi

Service Brakes 6 complaints

Median: 1,800 mi

Where Are Complaints Coming From?

Top states by complaint count.

FL: 15 CA: 9 NY: 7 VA: 5 NC: 5 MD: 5 WA: 3 NJ: 3 PA: 3 TX: 3

Kia Niro — Other Years

See how this model compares across different model years.

Year	Complaints	Median Mileage	Top Issue	Crashes
2017	95	30,000	Engine	4
2019	77	35,000	Power Train	6
2020	41	46,000	Engine	4
2022	33	-	Service Brakes	6
2023	63	-	Unknown Or Other	14

Data source: View this vehicle on NHTSA.gov | NHTSA ODI Complaints Database. Public domain.

Methodology: Complaint counts and mileage distributions are computed directly from consumer-reported NHTSA complaints. This data represents reported issues, not failure rates — vehicles without complaints are not represented. Full methodology.

Data through: 2026-03-28