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2018 Hyundai Ioniq

ElectricPlug-in hybridHybrid
Midsize Cars
4 EPA-rated configurations
Data refreshed 2026-09-11
D
Safety Signal
67 / 100 from the NHTSA recall record
Recalls2 critical3
Complaintsowner reports to NHTSA17
Crash ratingNHTSA overall—
EV rangebest configuration, EPA124 mi
Fuel economybest combined, EPA58 mpg
202220212020201920182017

The 2018 Hyundai Ioniq is sold in the U.S. as a electric, plug-in hybrid and hybrid midsize car with 4 EPA-rated configurations. Its longest-range version, the Ioniq Electric, is EPA-rated at 124 miles with 136 MPGe combined efficiency. NHTSA lists 3 recall campaigns for this model year, 2 rated critical, which gives it a Safety Signal grade of D. Owners have filed 17 complaints, most often about the electrical system.

Specs & fuel economy

Source: EPA fueleconomy.gov
ConfigurationPowertrainDriveEngine / motorCityHwyCombRangekWh/100miCharge (240V)Annual fuel*
Ioniq ElectricElectricFWD88 kW AC PMSM150122136 MPGe124 mi254 h$550
Ioniq Plug-in HybridPlug-in hybridFWD1.6L 4-cyl + 32kW IPMSM535252 (76 MPGe blended)29 mi electric282.3 h$1,200
Ioniq BlueHybridFWD1.6L 4-cyl + 240V Li-Ion575958———$1,100
IoniqHybridFWD1.6L 4-cyl + 240V Li-Ion555455———$1,150

*EPA estimate at 15,000 miles/year at EPA reference fuel and electricity prices. fueleconomy.gov record ids: 39641, 39768, 39614, 39615.

Factory warranty running out?

The 2018 Hyundai Ioniq is in the years where high-voltage electronics and module repairs land on the owner. Compare extended-coverage quotes in about two minutes.

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Recalls (3)

Source: NHTSA recall database
!critical

Hybrid Propulsion System

232
10,575 vehiclesHybrid onlyPlug-in hybrid only
ProblemHyundai Motor America (Hyundai) is recalling certain 2017-2018 Ioniq HEV and Ionic PHV vehicles previously recalled under recall number 18V-704. The Power Relay Assembly (PRA) located underneath the rear seat may overheat.RiskAn overheated PRA increases the risk of a fire.FixDealers will inspect and replace the main relay or PRA, as necessary, free of charge. Owner notification letters were mailed August 23, 2022. Owners may contact Hyundai customer service at 1-855-371-9460. Hyundai's number for this recall is 232. This recall replaces NHTSA recall number 18V-704. Vehicles already repaired under the previous recall will need to have the new remedy completed.
NHTSA campaign 22V459000reported Jun 28, 2022Hyundai Motor America
○minor

Electrical System

215
2,679 vehiclesElectric only
ProblemHyundai Motor America (Hyundai) is recalling certain 2017-2019 Ioniq electric vehicles. An unstable electrical ground may cause the vehicle to enter a fail-safe mode with reduced acceleration and power. In certain conditions while in fail-safe mode, the vehicle may accelerate after the gas pedal is released.RiskUnexpected acceleration following gas pedal release can increase the risk of a crash.FixDealers will update the EPCU (Electric Power Control Unit) software and repair the ground wiring, free of charge. Owner notification letters were mailed February 9, 2022. Owners may contact Hyundai customer service at 1-855-371-9460. Hyundai's number for this recall is 215.
NHTSA campaign 21V944000reported Dec 7, 2021Hyundai Motor America
!critical

Hybrid Propulsion System

178
10,575 vehiclesHybrid only
ProblemHyundai Motor America (Hyundai) is recalling certain 2017-2018 Hyundai Ioniq Hybrid and 2018 Ioniq Plug-In Hybrid vehicles. The Main Relay within the Power Relay Assembly (PRA) may have inadequate connections between its contacts, causing increased electrical resistance.RiskThe increased electrical resistance can overheat the rear seat which is above the PRA, increasing the risk of a fire.FixHyundai 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 February 28, 2019. Owners may contact Hyundai customer service at 1-855-371-9460. Hyundai's number for this recall is 178.
NHTSA campaign 18V704000reported Oct 5, 2018Hyundai Motor America

NHTSA defect investigations

Electrical System:Propulsion System — Pedestrian alert sounds closed

NHTSA received a petition on or about July 18, 2022, requesting that Federal Motor Vehicle Safety Standard (FMVSS) 141 be applied to all electric and hybrid vehicles operating in the United States. The petition can be reviewed at NHTSA.gov under ODI Number 11486072. FMVSS 141 establishes performance requirements for pedestrian alert sounds for motor vehicles. The standard applies to hybrid and electric vehicles that have a gross vehicle weight rating of 4,536 KG or less or are defined as low-speed vehicles. The standard became fully applicable to all such vehicles manufactured on or after March 1, 2021.On January 27, 2023, NHTSA opened Defect Petition (DP) 22-005 to evaluate the subject matt

Opened Jan 27, 2023 · closed Aug 7, 2023 · action DP22005

Owner complaints

Source: NHTSA complaint database
17complaints filed

2 involved a crash · 0 a fire · 2 injuries · 0 deaths reported

Filed per year: 2018: 4 · 2019: 2 · 2020: 1 · 2021: 1 · 2022: 3 · 2023: 1 · 2024: 3 · 2025: 1 · 2026: 1

Most-cited components

Unspecified4
Electrical System3
Engine3
Power Train3
Vehicle Speed Control2
Service Brakes1

What owners describe

“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 direc…”Nov 25, 2025 · Engine · NHTSA owner report
“The contact owned a 2018 Hyundai Ioniq Hybrid. The contact stated while driving 75 MPH with her aunt in the front passenger's side seat, another vehicle suddenly merged into the contact's lane, causing the passenger's side of the vehicle to crash into the driver's side of the other vehicle. The vehicle then veered into…”Nov 25, 2024 · Air Bags · NHTSA owner report
“The clutch failed and the clutch and I believe the clutch actuator had to be replaced. It was not available for inspection upon request. My safety and the risk of others were compromised by the constant jerking and sputtering, of the gears that took place during vehicle operation. My acceleration was laggy and at some …”Oct 11, 2024 · Power Train · NHTSA owner report

Complaint counts are raw owner reports to NHTSA, not verified defects, and scale with how many were sold. Use them to spot patterns, not to rank.

Crash ratings

Source: NHTSA NCAP

NHTSA has not published 5-Star crash ratings for this model year.

Other Ioniq model years

A

2022 Hyundai Ioniq

0 recalls · 27 complaints

A

2021 Hyundai Ioniq

0 recalls · 20 complaints

B

2020 Hyundai Ioniq

1 recalls · 29 complaints

B

2019 Hyundai Ioniq

2 recalls · 32 complaints

F

2017 Hyundai Ioniq

5 recalls · 50 complaints

Sources & method

Safety Signal starts every model-year at 100 and subtracts points per open NHTSA recall campaign by severity: critical 15 (fire risk, park-outside or do-not-drive advisories), high 8 (brakes, steering, airbags, loss of drive power, structure, battery), moderate 6, minor 3 (software, labels, lighting fixed by an update). Floor 35. A ≥ 90, B ≥ 80, C ≥ 70, D ≥ 60, otherwise F. Complaint counts and NHTSA crash ratings are shown separately and are not blended into the grade.

EPA figures come from fueleconomy.gov vehicle records. Recalls, complaints, investigations and crash ratings come from NHTSA's public flat files, refreshed weekly.

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