HyundaiIoniq Plug-In Hybrid2018Electric/hyundai/ioniq-plug-in-hybrid/2018/electric/

2018 Hyundai Ioniq Plug-In Hybrid

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2018 Ioniq Plug-In Hybrid.

Engine ElectricTransmission Automatic (AM6)

The 2018 Hyundai Ioniq Plug‑In Hybrid Electric, built on Hyundai’s K platform, combines a small electric motor with a gasoline‑assist system and runs through an automatic (AM6) transmission, offering a quiet, efficient powertrain that is well‑balanced for urban driving; its modest 4 owner complaints and a single recall underscore a strong reliability record that has only improved over time, with the model’s lowest complaint count—just 3—in 2022, placing the 2018 Ioniq among the more dependable entries in Hyundai’s hybrid lineup.

Quick specs

Fluid capacities, tune-up values and fuel economy at a glance.

Lug nut torque80-94 ft-lbsOEM · verified
EPA efficiency53/52/52 MPGeEPA · verified
EPA electric range630 miEPA · verified

Fitment & sizes

Replacement part sizes and factory part numbers — battery, bulbs, filters and belts.

From the factory this vehicle uses OE oil filter 2630035505. Each part links to every other vehicle that shares it, so a part you already stock may fit more of your fleet than you'd expect.

Tire sizeP205/55R16OEM · verified
Wheel / rim6.5-J inOEM · verified

OE service part numbers OEM · verified

Engine oil filter2630035505
Front wiper blades99H09AKA18H alt 99H09AKA26H

Full specifications

Engine, drivetrain, dimensions and economy.

Engine & drivetrain NHTSA vPIC

TransmissionAutomatic (AM6)

Dimensions & weight NHTSA vPIC

Overall length176 in
Overall width71.7 in
Overall height57.1 in
Wheelbase106.3 in
Curb weight3014 lb
Track (front / rear)61.4 / 62.2 in
Weight distribution (front / rear)54/46

Ratings & economy EPA / vPIC

EPA city / highway / combined53 / 52 / 52 MPGe
Electric range630 mi
Charge time (240V)2.3 hr
Electric motor32kW IPMSM
Energy use28.0 kWh/100mi
DrivetrainFront-Wheel Drive
Recommended fuelRegular Gasoline

Service quick specs OEM factory data

Capacities, torques and tune-up values from the factory service manual.

This engine DOT 3 brake fluid. Torque lug nuts to 80-94 ft-lbs.

Lubricants & capacities

Automatic Transmission FluidGL-4
Automatic Transmission Fluid Capacity1.1-1.8
Brake FluidDOT 3

Chassis torques

Lug Nuts80-94 ft-lbs
Lug Nuts80-94 ft-lbs

Brakes

Brake Caliper Bolt to Carrier Torque16-23
Brake Caliper Carrier to Hub Bolt TorqueFront: 72-; Rear: 47-
Brake Caliper Bolt to Carrier Torque16-23
Brake Caliper Carrier to Hub Bolt TorqueFront: 72-; Rear: 47-
Vented Rotor Minimum Thickness for ReplacementFront: .790; Rear: .331
Variation from Parallelism Thickness Variation.0002
Maximum Rotor Runout.002
Vented Rotor Minimum Thickness for ReplacementFront: .790; Rear: .331

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the spark plugs every 97,500 mi; coolant every 30,000 mi. The big-interval services (every 30,000 mi for coolant, and the transmission fluid) are the ones owners most often skip — on a lower-mileage example, assume the original fluids are still in it and check them first.

Every 7,500 miAccessory Drive Belt (inspect) · Air Conditioning System (inspect) · Battery (inspect) · Brake Line (inspect) · Brake Linings (inspect) · Brake Rotor (inspect)
Every 15,000 miBrake Hydraulic System (inspect fluid level) · Brake Pedal Assembly (inspect) · Clutch Hydraulic Line (inspect) · Exhaust System (Complete) (inspect) · Fuel Evaporative Canister Filter (inspect) · Fuel Filter (inspect)
Every 22,500 miClutch Hydraulic System (drain & refill) · Engine Air Filter Element (replace)
Every 30,000 miEngine Coolant System (drain, flush & refill) · Fuel Evaporative Emission Control System Lines (inspect) · Fuel Line (inspect) · Fuel Tank Filler Cap (inspect) · Hybrid Inverter (drain, flush & refill coolant)
Every 37,500 miTransmission Assembly (inspect fluid level)
Every 67,500 miDrive Belt (replace)
Every 97,500 miSpark Plugs (replace)
At 120,000 miEngine Coolant System (drain, flush & refill) · Hybrid Inverter (drain, flush & refill coolant)

Reliability & federal safety record

Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.

The 2018 model year represents the second year of the Ioniq Plug-In Hybrid's production run, carrying over the single recall and open investigation from the 2017 launch year while registering only four complaints—tied with 2020 as the second-lowest volume in this generation and significantly below the 2021 spike of eighteen complaints. Unlike subsequent model years that saw zero recalls but fluctuating complaint volumes, 2018 sits at the end of the initial recall phase yet maintains zero crash and fire complaints according to federal records. Technical Service Bulletins peaked at forty-four for 2018, substantially higher than the seven issued in 2017 and declining through thirty-eight in 2020 to eleven by 2022, indicating concentrated manufacturer guidance for early production refinement. Complaints were distributed evenly across disparate categories including structure, visibility, and engine cooling with no dominant pattern, and the data does not specify a single systemic root cause. Given its low complaint volume, absence of crash or fire incidents, and position before the 2021 complaint surge, the 2018 represents a relatively stable acquisition point within this generation, provided the single open recall has been addressed.

1
Open recalls
NHTSA campaigns
44
Service bulletins
Manufacturer communications
1
ODI investigations
Office of Defects Investigation
4
Owner complaints
0 involved a crash · 0 a fire
Owner complaints by model year NHTSA · this generation & adjacent

Owner complaints filed with NHTSA, by component

All 4 complaints on record, top 4 components.

Unknown Or Other1
Structure1
Visibility/Wiper1
Engine & Engine Cooling1

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 1 of 1 campaigns on record for this vehicle.

22V459000Hybrid Propulsion System: InverterReported 28/06/2022

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… 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…

Technical service bulletins NHTSA · verified

Showing 5 of 44 bulletins on record with NHTSA.

BulletinDateComponentSummary
DTN DL2026-04-10Air BagsThe National Highway Traffic Safety Administration (NHTSA) has identified the presence of…
DTN DCS2026-04-10Air BagsThe National Highway Traffic Safety Administration (NHTSA) has issued an urgent safety…
25-BD-012H TSB2025-11-05Exterior LightingThis bulletin provides information regarding condensation related to the accumulated…
25-01-024H-1 TSB2025-05-08Electrical SystemSome vehicles may exhibit a loss of connectivity or interruptions in the middle of using…
24-BD-001H2024-02-14VisibilityThis bulletin contains information about the proper removal of the windshield wiper blade…

VIN tools

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VIN
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Build data
Plant, GVWR class, engine and body data for any 17-character VIN.
Recalls
Check open recall campaigns against a specific vehicle by VIN.

Vehicles with shared specs

Find every vehicle that shares this one's battery, bulbs, oil capacity, platform or parts.

Reference guides

Cross-vehicle references for the kinds of data on this page.

Frequently asked

Does the 2018 Ioniq Plug-In Hybrid have open recalls?

NHTSA lists 1 recall campaign(s) for this model year. Check your specific vehicle by VIN.

What is the EPA range and efficiency of the Ioniq Plug-In Hybrid?

EPA figures are 53 city / 52 highway / 52 combined MPGe. EPA electric range is 630 miles.