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EnginePart report

2018 Hyundai Ioniq Hybrid Engine Problems

Complaints
3about this part
Share
23%of 13 total for the year
Median mileage
4,300miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 3 complaints about the engine of the 2018 Hyundai Ioniq Hybrid, 23% of the 13 complaints for this model year. Where a mileage was given, the median is 4,300 miles.

Fewer than 15 complaints name this part, so treat the figures as a rough indication only.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“It began shortly after I purchased the car in feb 2018 with the A/C working only intermittently and the settings on the cluster having the same problem, and this electrical problem escalated into a safety issue when on dec 6 the rke failed (battery on fob strong) and a re-start on car did not work, until the spare key was tried. Since dealer found no problem with either key, the safety issue remains a major concern for the senior citizen owner who might get caught again without access to the car and with a non-functioning engine. …”

NHTSA complaint #11166040, filed 2019-01, 4,300 miles

“My 2018 Hyundai Ioniq Hybrid has a safety-critical transmission defect. The vehicle slips violently from 1st to 2nd gear, loses acceleration, and causes unpredictable hesitation. This creates a danger when merging onto highways or crossing intersections. Hyundai refused goodwill assistance, denied escalation, and directed me to BBB Auto Line, but BBB does not accept 2018 vehicles. This defect matches known DCT failures in Hyundai hybrid models and presents a significant safety risk, especially when transporting my two young children ( we lost mother during the childbirth .”

NHTSA complaint #11701382, filed 2025-11

“The car engine started to stall, the engine light came on and advised me to shut off engine then I pulled over and smoke immidiatley filled the cabin and outside the hood. My engine could have blown up. Had I not pulled over so quickly my car would have caught fire and I would have died. Yes the Hyundai Folsom inspected the car and listed issue was a hole in the engine block. They stated it was caused by premature wearing of the rod bearings and refused to repair. The ONLY warning happened within seconds of the car stalling and failing to accelerate before I pulled over. …”

NHTSA complaint #11581760, filed 2024-04

Related service bulletins

Engine: other model years

YearComplaintsShare of year
202214%
202118%
2019319%
2018323%
20171229%

Other parts of the 2018 Hyundai Ioniq Hybrid

Electrical system
3 complaints
Other or unknown
3 complaints
Transmission and drivetrain
3 complaints
Vehicle speed control
2 complaints
Air bags
1 complaints
Brakes
1 complaints
Steering
1 complaints
Visibility (wipers, defrost, mirrors)
1 complaints

← All problems reported for the 2018 Hyundai Ioniq Hybrid

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Nov 1, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology