Hyundai and Kia Theta II Engine Recall: What Every Owner Should Know
If your Hyundai or Kia is powered by the 2.0L turbocharged Theta II GDI engine, you may have heard about one of the largest engine-related recall and class-action actions in the U.S. auto industry. Affected owners have widely reported sudden engine knocking, stalling, loss of power, and in severe cases engine seizure or fire. This guide explains the issue in plain English, how to check whether your vehicle is affected, and what your options are if your engine has already failed.
Which engines and models are involved?
The concern centers on Hyundai and Kia's Theta II GDI family — most notably the 2.0L turbo (engine code G4KH) and related 2.4L variants used across popular models, including:
- Hyundai Sonata, Santa Fe / Santa Fe Sport, Tucson, Veloster N, Elantra N
- Kia Sportage, Optima, Sorento
Manufacturing debris and bearing wear can restrict oil flow to the connecting-rod bearings, producing a metallic knocking noise that often precedes catastrophic failure.
Common warning signs
- Deep knocking or ticking from the engine that worsens under load
- Illuminated oil-pressure or check-engine light
- Loss of power, stalling, or refusal to restart
- Excessive oil consumption between changes
Not sure whether it is time to act? See our guide on when to replace your car engine.
Recall, warranty, and the class-action settlement
In response to these failures, Hyundai and Kia issued recalls and a software update known as the Knock Sensor Detection System (KSDS), and a class-action settlement provided extended engine warranties and reimbursement for qualifying repairs to many owners. Eligibility depends on your VIN, model year, and repair history.
To confirm your status: enter your VIN on the manufacturer's official recall page or at NHTSA (nhtsa.gov/recalls), and contact the official settlement administrator for any claim questions. This article is general information, not legal advice — for settlement or warranty disputes, consult the official program or a qualified attorney.
If your engine has already failed: replacement options
When a Theta II engine has seized or is no longer covered, installing a quality replacement is usually faster and more cost-effective than a full dealer rebuild. Power Engines stocks brand-new and low-mileage Theta II GDI engines with a warranty, ready to ship:
- Hyundai Sonata 2.0L Turbo G4KH Theta II GDI engine
- Hyundai Santa Fe 2.0L Turbo G4KH Theta II GDI engine
- Kia Sportage 2.0L Turbo G4KH Theta II GDI engine (Gen 1)
- Kia Sportage 2.0L Turbo G4KH Theta II GDI engine (Gen 2)
Browse the full lineup in our Hyundai engines and Kia engines collections, or view all engines for sale.
The bottom line
The Theta II issue is well documented, and many owners still qualify for manufacturer assistance — always check your VIN first. But if your engine is already gone and coverage has lapsed, a warrantied replacement gets you back on the road quickly. Our team can help you match the correct engine to your exact VIN.
Disclaimer: This content is provided for general informational purposes and does not constitute legal advice. Recall eligibility and settlement terms are determined solely by the manufacturer and the official settlement administrator.
