2018 Hyundai Ioniq: recalls, fuel economy and safety ratings
EPA rates the 2018 Hyundai Ioniq at 52–58 mpg combined (gas versions) and 136 MPGe combined with 124 miles of EPA-rated range across 4 versions. NHTSA lists 3 safety recalls and 17 owner complaints for this model year.
Safety recalls
3
EPA combined mpg
52–58
NHTSA overall rating
—
Recall file dated Oct 28, 2026 · EPA file dated Sep 29, 2026 · updated Oct 28, 2026, 7:36 AM EDT
NHTSA lists this vehicle as IONIQ ELECTRIC, IONIQ HYBRID, IONIQ PLUG-IN HYBRID.
Check your own car: enter your 17-character VIN at nhtsa.gov/recalls to see open recalls for that exact vehicle, and contact a Hyundai dealer to schedule the repair — safety recall repairs are free. The list below covers the whole model year, so not every recall applies to every car.
2018 Hyundai Ioniq recalls
NHTSA's recall file lists 3 safety recalls for the 2018 Hyundai Ioniq, newest first.
Hybrid propulsion system: Inverter
NHTSA 22V459000Reported Jun 28, 2022
Filed by
Hyundai Motor America (manufacturer recall no. 232)
Units affected
10,575 (estimate)
Problem
Hyundai 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.
Risk
An overheated PRA increases the risk of a fire.
Remedy
Dealers 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.
Hyundai 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.
Risk
Unexpected acceleration following gas pedal release can increase the risk of a crash.
Remedy
Dealers 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.
Hyundai Motor America (manufacturer recall no. 178)
Units affected
10,575 (estimate)
Problem
Hyundai 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.
Risk
The increased electrical resistance can overheat the rear seat which is above the PRA, increasing the risk of a fire.
Remedy
Hyundai 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.
Recall summaries are written by NHTSA from manufacturers' defect reports. Dates are when NHTSA received the report.
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2018 Hyundai Ioniq fuel economy by version
EPA city/highway/combined estimates for each engine, transmission and drive combination; electric figures are in MPGe (miles per gallon equivalent). Annual fuel cost is EPA's estimate for 15,000 miles a year (55% city, 45% highway) at EPA's current fuel-price assumptions; your cost will vary.
Source: FuelEconomy.gov (U.S. DOE and EPA), file dated Sep 29, 2026. Each version links to its FuelEconomy.gov record.
EPA estimates come from standardized lab tests so cars can be compared fairly; real-world mileage depends on speed, weather, load, tires and driving style.
2018 Hyundai Ioniq crash-test ratings
NHTSA 5-Star Safety Ratings for the tested versions. More stars mean a lower chance of serious injury in that type of crash. Rollover risk is NHTSA's estimated chance of rolling over in a single-vehicle crash.
2018 Hyundai Ioniq NHTSA 5-Star Safety Ratings
Tested vehicle
Overall
Frontal
Side
Rollover
Rollover risk
Forward collision warning
2018 Hyundai Ioniq Electric 5 HB FWD
Not rated
Not rated
Not rated
Not rated
—
Optional
2018 Hyundai Ioniq Hybrid 5 HB FWD
Not rated
Not rated
Not rated
Not rated
—
Optional
2018 Hyundai Ioniq Plug-In 5 HB FWD
Not rated
Not rated
Not rated
Not rated
—
Optional
Source: NHTSA 5-Star Safety Ratings (New Car Assessment Program), checked Oct 26, 2026.
Star ratings compare vehicles of similar size and weight; a frontal rating for a large pickup is not directly comparable with one for a small car.
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2018 Hyundai Ioniq owner complaints
Owners have filed 17 complaints with NHTSA about the 2018 Hyundai Ioniq, most recently on May 13, 2026. 2 mention a crash, 0 a fire, 2 injured people and 0 deaths. These are unverified reports; a complaint is not proof of a defect.
Most-cited components in 2018 Hyundai Ioniq complaints
Component named in complaints
Mentions
Unknown or other
4
Electrical system
3
Engine
3
Power train
3
Vehicle speed control
2
Visibility/wiper
2
Air bags
1
Engine and engine cooling: Exhaust system: Emission control: Catalytic convertor
1
Service brakes
1
Steering
1
Source: NHTSA consumer complaint files (complaints received since January 1, 2015). One complaint can name several components.
