The short version
Hyundai and Kia engine failures, most famously in the Theta II family, have been the subject of massive recalls, a federal civil penalty, and a nationwide class action settlement that extended engine warranty coverage for millions of vehicles. An engine that knocks, burns oil, stalls, or seizes under warranty is a classic lemon law defect in California. Getting a replacement engine does not end the story: if the replacement develops the same problems, the manufacturer has still failed to conform the vehicle to its warranty. Stalling is a safety defect, and for safety defects two repair attempts can be enough. A prevailing consumer's attorney fees are paid by the manufacturer.
Is Hyundai or Kia engine failure covered by California's lemon law?
Yes, an engine defect covered by the manufacturer's warranty that the dealer cannot fix after a reasonable number of attempts entitles you to a refund or replacement vehicle under Civil Code section 1793.2(d)(2). Few defects impair a vehicle's use, value, and safety as completely as an engine that knocks, consumes oil, loses power, or seizes. The legal questions in these cases are rarely about whether the defect is substantial; they are about repair counts, warranty coverage, and what earlier recall and settlement paperwork means for your specific vehicle.
Engine claims are one of the two big Hyundai and Kia patterns we see; the other is EV charging, covered in our guide to ICCU and charging system failures. Both are gathered on the Hyundai and Kia hub, and the general rules live in the California lemon law guide.
What is the Theta II engine problem?
The Theta II is a Hyundai and Kia four-cylinder engine family that became the center of years of recalls and litigation over premature bearing wear and engine failure, with owners commonly reporting a knocking or ticking sound, sudden loss of power, stalling, and in some cases engine fires. Public investigations pointed to manufacturing debris interfering with oil flow to the connecting-rod bearings. The fallout was unusually well documented: NHTSA recalls beginning in 2015, a record civil penalty against the companies, and a class action settlement, finalized years later, that extended coverage for qualifying engines to 15 years or 150,000 miles for connecting-rod bearing damage and required installation of knock-sensor detection software (KSDS) that puts the car in reduced-power "limp" mode when it detects bearing wear.
As always, a documented pattern does not mean every vehicle is defective; it means your individual repair history sits inside a story the manufacturer already knows.
The dealer replaced my engine and it still has problems. What now?
An engine replacement that does not cure the problem strengthens your lemon law claim rather than resetting it. The Song-Beverly Act requires the manufacturer to conform the vehicle to its warranty, not to swap parts. If the replacement engine knocks, stalls, burns oil, or triggers the same warnings, the nonconformity was never repaired, and every visit, before and after the swap, counts in the repair-attempt history. The same logic applies when a dealer performs the KSDS software update or a bearing inspection and sends you home: those are repair attempts for the underlying condition if your complaint was the underlying condition. Insist that your symptoms, in your words, appear on each repair order.
Days matter too. Engine replacements routinely keep vehicles at the dealer for weeks waiting on parts, and a cumulative total of more than 30 calendar days out of service for warranty repair is one of the situations where California law presumes the manufacturer has had its reasonable chance.
Is stalling a serious safety defect under the lemon law?
Stalling is naturally framed as a safety defect, because an engine that dies in traffic takes power steering, acceleration, and predictability with it. That framing has a concrete legal payoff. Under the Tanner Consumer Protection Act, Civil Code section 1793.22, a reasonable number of repair attempts is presumed within the first 18 months or 18,000 miles after just two attempts when the defect is likely to cause death or serious bodily injury, versus four attempts for ordinary defects or a cumulative total of more than 30 calendar days out of service. Whether a particular stalling condition meets the serious-safety standard is a fact question, but it should be argued from the first letter, not discovered at trial.
Does the Theta II class settlement stop me from suing?
Not necessarily, but it is a real question that requires looking at your VIN, your purchase date, and the settlement's release language before anyone gives you a confident answer. The nationwide settlement extended warranty coverage and set up compensation programs, and class members gave up certain claims in exchange. Individual Song-Beverly claims based on your own vehicle's failed repair history are a different animal from the class claims, and the extended 15-year, 150,000-mile coverage can actually help a lemon claim by keeping your defect inside an express warranty. But whether any part of your claim was released, and how the settlement interacts with a California buyback demand, is a vehicle-specific legal analysis. That is a large part of what the free consultation is for.
What compensation can I get for a Hyundai or Kia engine defect?
A qualifying vehicle gets you a repurchase or a replacement, at your choice, and the repurchase math is set by statute. The refund covers your down payment, monthly payments, payoff, official fees, and incidental costs such as towing and rentals. The one deduction is the mileage offset in Civil Code section 1793.2(d)(2)(C): miles at the first repair attempt, divided by 120,000, multiplied by the price you paid. Our lemon law calculator turns those inputs into a working estimate. Willful noncompliance exposes the manufacturer to a civil penalty of up to double damages under Civil Code section 1794(c), and fee-shifting under section 1794(d) puts a prevailing consumer's attorney fees on the manufacturer.
Do the 2025 lemon law changes apply to Hyundai and Kia?
Yes. The AB 1755 and SB 26 procedures apply only to manufacturers that opted in, and Hyundai and Kia are listed separately, but as of July 6, 2026 all three are on the DCA's published list: Hyundai Motor America elected in on April 28, 2025, Kia America on May 1, 2025, and Genesis Motor America on April 28, 2025. The opt-in system brings a shorter filing deadline, a mandatory pre-suit notice to preserve civil penalties, and mandatory mediation, and those rules now govern claims against all three brands. Manufacturers can elect in at any time, so confirm the current status on the Department of Consumer Affairs list when your claim starts. Our AB 1755 hub walks through what turns on the answer.
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