NHTSA campaign 18V704000 · Hyundai campaign 178
Hyundai Recall 18V-704: Electrical Resistance at Main Relay May Cause Fire
NHTSA recall 18V704000 (Hyundai campaign 178) was reported by Hyundai Motor America on October 5, 2018, with 10,575 vehicles potentially affected (per NHTSA). NHTSA's record lists the Hyundai Ioniq Hybrid for model years 2017–2018. Owners were notified on February 28, 2019, per NHTSA.
Updated daily from NHTSA's recall files
Is my vehicle included?
This page lists, by model year, the vehicles NHTSA's recall record names for campaign 18V704000 in the model years try.vin imports (1995 and later); NHTSA's own record can list more. A model year on the list doesn't mean every vehicle of that year is included, and some may already have been repaired.
To see whether a specific vehicle is included and still needs the repair, enter its VIN at nhtsa.gov/recalls.
Hyundai VIN check: decode a VIN to see its year, make and model.
Key facts
- NHTSA campaign
- 18V704000 (also written 18V-704 or 18V704)
- Filed by
- Hyundai Motor America
- Hyundai campaign number
- 178
- Report received
- Potentially affected
- 10,575 vehicles (per NHTSA)
- Component
- Hybrid Propulsion System — Inverter
- Owners notified
Repair completion: 85.07% (latest rate the manufacturer reported to NHTSA; dataset updated October 21, 2026)
NHTSA cautions against comparing completion rates across recalls or manufacturers. How try.vin reads them.
Vehicles listed for this recall
NHTSA's recall record lists these vehicles for recall 18V704000. try.vin imports model years 1995 and later, so NHTSA's own list can be longer. Model years with a try.vin recall page link to it. Build dates are NHTSA's range for a model year (per NHTSA); a vehicle built in that range is not necessarily included.
Hyundai
All Hyundai recallsNHTSA's recall notice
As NHTSA's recall record states it for campaign 18V704000.
Defect description
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.
Safety consequence
The increased electrical resistance can overheat the rear seat which is above the PRA, increasing the risk of a fire.
Manufacturer 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.
Notes
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.
Sources
Official NHTSA notice for recall 18V704000
Campaign details come from NHTSA's recall files, which try.vin imports once a day. The plain-language subject and the completion rate come from the U.S. Department of Transportation's Recalls Data dataset. How try.vin reads recall data.