2018 Hyundai Ioniq Plug-in Hybrid: Recalls, Problems & MPG
Here are the deets on the 2018 Hyundai Ioniq Plug-in Hybrid: 1 recall, 4 owner complaints and up to 52 mpg combined.

Recalls
1 vehicle recall from the manufacturer. Repairs are free. Check your VIN to see if one is still open on your car.
Hybrid system Vehicle recall #22V459000 · 2022 · 10,575 vehicles
What's wrong: The power relay assembly (pra) located underneath the rear seat May overheat.
Why it matters: An overheated pra increases the risk of a fire.
The fix: Dealers will inspect and replace the main relay or pra, as necessary, free of charge. Owner notification letters were mailed August 23, 2022.
Most-reported problems
Owner complaints filed with NHTSA, by component. One complaint can list several components. 0 mention a fire, 0 injuries and 0 deaths were reported.
What owners describe
- Engine & cooling (1): no single recurring theme in the descriptions.
- Visibility/Wiper (1): no single recurring theme in the descriptions.
- Body & structure (1): no single recurring theme in the descriptions.
- Other / unknown (1): no single recurring theme in the descriptions.
The 2018 Hyundai Ioniq Plug-in Hybrid has 4 owner complaints, ranking #4 of 6 Ioniq Plug-in Hybrid model years for complaints (about average; the typical year has 4). Neighboring years: 2017 (0 complaints, 1 recalls), 2019 (10 complaints, 0 recalls).
Engines & fuel economy (EPA)
| Engine | Transmission | Drive | City | Hwy | Comb. | Fuel |
|---|---|---|---|---|---|---|
| 1.6 L 4-cyl hybrid | Automatic (AM6) | Front-Wheel Drive | 53 | 52 | 52 | Regular Gas and Electricity |
Want the full repair deets? Get the factory manual.
Recall and complaint data tells you what goes wrong. A service manual tells you how to fix it: torque specs, wiring diagrams, fluid capacities and step-by-step procedures for the 2018 Hyundai Ioniq Plug-in Hybrid.
Closest thing to the factory manual for most years. Pay once, keep it.
Most $25–$78, one-timePro-shop repair procedures, wiring diagrams and TSBs for your exact car.
From $19.99/mo · $39.99/yrOEM procedures, specs and recall/TSB info, the same source many shops use.
From $19.99/mo · $59.99/yrStep-by-step photos written from a real teardown. Great for first-timers.
Books ~$30–$40 · AllAccess $34.99/moHeads up: we may earn a commission if you buy through these links, at no extra cost to you. Prices checked 2026-10 and can change. We never host or link to pirated manuals. Disclosure
FAQ
Does the 2018 Hyundai Ioniq Plug-in Hybrid have any recalls?
Yes. NHTSA lists 1 vehicle recall for the 2018 Hyundai Ioniq Plug-in Hybrid. Recall repairs are free at any dealer, no matter how old the car is. Check your VIN at nhtsa.gov/recalls.
What are the most common 2018 Hyundai Ioniq Plug-in Hybrid problems?
Owners have filed 4 complaints with NHTSA. The most-reported areas are engine & cooling (1), visibility/wiper (1), body & structure (1).
What gas mileage does the 2018 Hyundai Ioniq Plug-in Hybrid get?
EPA ratings run up to 52 mpg combined (1.6 L, Automatic (AM6)), across 1 engine and transmission combos.
Where can I get a 2018 Hyundai Ioniq Plug-in Hybrid repair manual?
eManualOnline sells downloadable manuals, Mitchell 1 DIY and ALLDATAdiy sell online access to factory repair data, and Haynes sells printed guides and online access. Pick a download if you want to keep it, or a subscription for wiring diagrams and TSBs.