NHTSA campaign 21V301000 · Hyundai campaign 203
Hyundai Recall 21V-301: Improperly Heat-Treated Piston Oil Rings
NHTSA recall 21V301000 (Hyundai campaign 203) was reported by Hyundai Motor America on April 28, 2021, with 158,493 vehicles potentially affected (per NHTSA). NHTSA's record lists the Hyundai Kona, Hyundai Veloster and Hyundai Elantra for model years 2019–2021. Owners were notified on August 24, 2021, 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 21V301000 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
- 21V301000 (also written 21V-301 or 21V301)
- Filed by
- Hyundai Motor America
- Hyundai campaign number
- 203
- Report received
- Potentially affected
- 158,493 vehicles (per NHTSA)
- Component
- Engine
- Owners notified
Repair completion: 90.91% (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 21V301000. 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.
NHTSA's recall notice
As NHTSA's recall record states it for campaign 21V301000.
Defect description
Hyundai Motor America (Hyundai) is recalling certain 2019-2020 Elantra, 2019-2021 Kona and Veloster vehicles equipped with 2.0L Nu MPI engines. The piston oil rings may not have been properly heat-treated, which could result in engine damage.
Safety consequence
A damaged engine may stall, increasing the risk of a crash. In addition, oil may leak onto hot exhaust components, increasing the risk of a fire.
Manufacturer remedy
Dealers will inspect and, if necessary, replace the engine, free of charge. In addition, Hyundai will deploy Piston Ring Noise Sensing System (PNSS) software. Owner notification letters were mailed August 24, 2021. Owners may contact Hyundai customer service at 1-855-371-9460.
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 21V301000
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.