Problems · NHTSA complaints

2018 Kia Niro Hybrid problems

Owners filed 60 complaints about the 2018 Kia Niro Hybrid with NHTSA between Jan 2018 and Sep 2026. The most-cited component is power train (19).

Complaints
60
Filed with NHTSA
Crashes
5
Reported by owners
Fires
0
Reported by owners
Injuries
4
People reported injured
Deaths
0
Reported to NHTSA
01 —By component

Complaints by component

One complaint can cite several components
  1. Power train19
  2. Electrical system18
  3. Engine17
  4. Service brakes6
  5. Vehicle speed control4
  6. Structure3
  7. Exterior lighting2
  8. Fuel/propulsion system2
  9. Seats1
  10. Air bags1
  11. Engine and engine cooling1
  12. Other / unknown11

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
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
20188
20193
20200
20212
20221
202314
202413
20256
202613

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

Power train

19 reports
“The dealership is falsely reporting to Kia Corporate and the NHTSA that Recall SC276 is 'completed' by only replacing a fuse. They are refusing to replace the actively leaking, fire-hazardous Hydraulic Clutch Actuator unless I pay an out-of-pocket diagnostic fee. They are violating federal recall safety mandates by trying to release a vehicle with an active, un-repaired recall leak.”
Owner complaint to NHTSAFiled Sep 15, 2026Power train, EngineODI 11764305

Electrical system

18 reports2 crashes
“My kia niro 2018 backup camera takes a few seconds to start up when the vehicle is put in reverse. the time it takes differs from a second to sometimes 5 seconds. I know of accident caused in a McDonalds drive through where someone was backing up but the cam didn't turn on right away and they got in a small accident.”
Owner complaint to NHTSAFiled Sep 3, 2026Electrical systemCrash reportedODI 11761999

Engine

17 reports
“On April 21, 2026, Go Kia Renton performed an oil change on my 2018 Kia Niro Touring (VIN). The car was in perfect condition just two weeks earlier — North Seattle Transmission did a full service on April 6, 2026 at 283,649 miles with no issues noted. Later that night while driving, the red oil light flashed. I pulled over immediately and called AAA. AAA towed the vehicle from Belltown [XXX] ) at 12:11 AM on April 23 to my house then at 9:14 AM towed it straight to Go Kia Renton. The AAA driver found oil leaking all over his tow truck. The car now has a dead battery and is showing Hybrid Control System / Low Voltage DC/DC Converter and Engine Control System codes. This appears to be a sudden engine seizure caused by oil loss shortly after dealer service.”
Owner complaint to NHTSAFiled May 4, 2026Electrical system, EngineODI 11735577

Service brakes

6 reports4 crashes
“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 I do t know if any other kia cars had this problem I got real lucky”
Owner complaint to NHTSAFiled Apr 29, 2025Service brakesCrash reportedODI 11657629

Vehicle speed control

4 reports
“The vehicle just shut down as I exited. The power and gas pressure decreased. Pulled over to see if my hybrid battery was defective or drained. It wasn’t. A notification popped up and said “Hybrid Control System or Low Voltage DC/DC Converter, Contact dealer for service. Finally got it towed to Kia of Valencia the next day and they said it was “Hydraulic Clutch Actuator” and they want charge me $2200 to fix it. But looking up the part, it says there’s a recall for that exact problem.”
Owner complaint to NHTSAFiled May 21, 2026Electrical system, Vehicle speed control, Unknown or otherODI 11739377

Structure

3 reports
“Everything is falling off the bottom of this vehicle”
Owner complaint to NHTSAFiled Feb 14, 2026StructureODI 11718030
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.