Is the engine a common complaint area for the 2018 Kia Niro?

Yes. NHTSA lists 19 Engine complaints for the 2018 Niro, which is 32% of all 60 complaints filed for that model year.

Is there a recall for the 2018 Kia Niro engine problem?

No related recall is listed in NHTSA data for this Engine problem area on the 2018 Niro, though some owners mention receiving a recall letter tied to fire risk concerns.

At what mileage do 2018 Kia Niro engine problems tend to show up?

The median mileage at failure among reported Engine complaints for the 2018 Niro is 74,000 miles.

How does the 2018 Niro compare to other years for engine complaints?

The 2018 Niro's 19 Engine complaints (32% share) is lower than the 2017 Niro's 34 complaints (41% share), but higher in share than the 2022 (23%) and 2023 (16%) model years.

Did the 2018 Kia Niro engine problems cause any crashes or fires?

NHTSA data lists zero crashes and zero fires among the reported Engine complaints for the 2018 Niro.

2018 Kia Niro Engine Problems

NHTSA lists 19 Engine complaints for the 2018 Kia Niro, 32% of its 60 total complaints for that year. No related recall is listed for this engine problem area. The median mileage at failure was 74,000.

Engine complaints: 19; 32% of 60
Crashes reported: 0
Fires reported: 0
Injuries reported: 0
Median mileage: 74,000 mi
Related recalls: 0

Typical engine symptoms owners report

Owners report the Exhaust Heat Recovery System (EHRS) or catalytic converter heat exchanger leaking coolant into the exhaust, which burns off and exits through the tailpipe.
This coolant loss leads to overheating, with dashboard messages such as "Engine Overheating - Request Service Now" and loss of coolant not lasting long in the system.
Some owners describe sudden loss of power or sluggish acceleration, with the vehicle failing to respond to the accelerator pedal at highway speed.
Others report abnormal shaking or vibration while driving around 65 mph, sometimes paired with an "Engine Control System" warning.
A few owners describe the engine or hybrid system failing to start, with the HEV warning light illuminated and low battery charge noted.
Some owners mention receiving a recall letter related to fire risk but say no repair remedy was available yet.

When 2018 Kia Niro engine complaints were filed

First complaint Jan 2, 2018, latest Sep 15, 2026.

19 complaints filed with NHTSA from Jan 2018 to Sep 2026; peak Oct 2023 (3).

Engine recalls for the 2018 Kia Niro

No safety recalls on record for this model year.

Engine complaints by Niro model year

Raw complaint counts per model year; newer years have had less time to accumulate complaints.

201734 (41%)
201819 (32%)
201915 (27%)
202011 (29%)
20213 (33%)
20227 (23%)
20237 (16%)
20241 (11%)
20253 (18%)

Frequently asked questions

Is the engine a common complaint area for the 2018 Kia Niro?: Yes. NHTSA lists 19 Engine complaints for the 2018 Niro, which is 32% of all 60 complaints filed for that model year.
Is there a recall for the 2018 Kia Niro engine problem?: No related recall is listed in NHTSA data for this Engine problem area on the 2018 Niro, though some owners mention receiving a recall letter tied to fire risk concerns.
At what mileage do 2018 Kia Niro engine problems tend to show up?: The median mileage at failure among reported Engine complaints for the 2018 Niro is 74,000 miles.
How does the 2018 Niro compare to other years for engine complaints?: The 2018 Niro's 19 Engine complaints (32% share) is lower than the 2017 Niro's 34 complaints (41% share), but higher in share than the 2022 (23%) and 2023 (16%) model years.
Did the 2018 Kia Niro engine problems cause any crashes or fires?: NHTSA data lists zero crashes and zero fires among the reported Engine complaints for the 2018 Niro.