The 2.4L Theta II GDI engine is at the center of one of the largest engine recall and class-action campaigns in U.S. automotive history. Connecting rod bearings fail because of manufacturing debris in the oil galleries, leading to engine knock and catastrophic failure. The KSDS (Knock Sensor Detection System) recall installs software that detects pre-failure - and many affected VINs now carry a lifetime engine warranty.
If your VIN is in scope, the engine is covered by an extended (often lifetime) warranty after the KSDS recall is performed. Past out-of-pocket repairs may also be reimbursable under the class-action settlement.
Manufacturing debris left in the oil galleries starves the rod bearings, causing knock that escalates into a thrown rod or seized engine. Typically 60,000-150,000 miles. Replacement long block is the only real fix.
Run free diagnosis →A rhythmic knock that gets louder with throttle. The KSDS recall installs software that lights a warning lamp before catastrophic failure. If your VIN is eligible, get the recall done immediately.
Run free diagnosis →Some affected vehicles experience sudden stalls as a precursor to engine failure. Multiple recalls and TSBs address this. Confirm VIN and recall status with Hyundai/Kia.
Run free diagnosis →Many Theta II engines burn 1 quart per 1,000 miles or worse. Consumption testing at the dealer is required to start a warranty claim - bring documentation.
Run free diagnosis →GDI engines develop carbon on the intake valves with no fuel washing them. Walnut blasting around 60,000-80,000 miles restores idle quality and prevents misfires.
Run free diagnosis →The metal debris that causes bearing failure also lodges in the pickup screen. Replacing the engine without cleaning the pan and lines causes repeat failures.
Run free diagnosis →Run a free AI diagnosis tailored to your exact vehicle. Get the most likely cause and repair estimate in under 30 seconds.
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2011-2014 Sonata, 2013-2014 Santa Fe Sport, 2014 Tucson, 2011-2014 Optima, 2012-2014 Sorento, 2011-2014 Sportage with the 2.4L Theta II - highest failure rates in the recall data.
Post-2019 vehicles use updated Smartstream engines or revised Theta II castings with cleaner machining. The 2.0T Theta and 2.0L Smartstream are both better-behaved than the original 2.4 Theta II.
Engine replacement out of pocket runs $5,000-$9,000. With the KSDS recall complete and an active extended/lifetime warranty, this is often $0 to the owner. Past repairs are reimbursable under the settlement - keep your receipts.
If your vehicle is throwing a check engine light, these are the codes most often associated with the problems above. Click any code for full diagnosis steps and typical repair costs.
Run your VIN through the Hyundai or Kia recall lookup tool. If covered, the KSDS recall is free, and many engines are eligible for a lifetime engine warranty after the recall is performed.
It is a software update that monitors the knock sensor pattern and lights a warning lamp + reduces power before catastrophic engine failure. It does not fix the bearing - it warns you in time to claim warranty repair.
Yes - the class-action settlement (Mendoza v. Hyundai and related) covers many past repairs. File a claim with documentation through the official settlement portal.
Yes, for many affected VINs. The terms require the KSDS recall to be performed and routine maintenance to be documented. Confirm coverage with a dealer in writing.
Only with full recall documentation, a clean knock test, and an oil consumption check. With recall complete and lifetime warranty intact, the risk drops dramatically.