A rhythmic knock from under the hood is one of the worst sounds a car can make. On a lot of Santa Fes, though, it's also one of the most likely to be fixed for free. Hyundai's Theta II four-cylinder engines had a well-documented manufacturing problem, and the recalls and settlements that followed still matter today. Here's how to figure out where your SUV stands.
What actually goes wrong inside
Hyundai's own recall filing explains it plainly: leftover debris from factory machining could restrict oil flow to the bearings. A worn connecting rod bearing makes a knocking noise and can eventually fail, which can stall the engine while you're driving. In the worst cases described in later lawsuits, a connecting rod can break and punch through the block.
Warning signs Hyundai lists in the recall paperwork:
- A cyclic knocking noise from the engine
- Reduced power or hesitation
- Check engine light
- Oil pressure warning light
Owners also commonly report metal flakes in the oil at oil changes, plus stalling and higher oil use, according to The Drive's rundown of the settlement.
Which Santa Fes are covered (and by what)
| Model years | Engine | Coverage | What you pay |
|---|---|---|---|
| 2013-2014 Santa Fe Sport (built Jun 28, 2012 to May 31, 2014) | 2.0T / 2.4L GDI | Recall 17V-226: inspection, short block replaced if needed | $0 |
| Santa Fe Sports that got a recall engine | 2.0T / 2.4L GDI | Recall 18V-934: high-pressure fuel pipe checked for leaks after the engine swap | $0 |
| 2013-2018 Santa Fe Sport, 2019 Santa Fe (qualifying VINs) | 2.0T / 2.4L GDI | Class settlement: lifetime short block warranty after the KSDS update | $0 for covered repairs |
| 2010-2012 Santa Fe | 2.4L Theta II MPI | Engine II settlement: 15 years / 150,000 miles | $0 for qualifying repairs |
| 2021-2022 Santa Fe (certain build dates) | 2.5L turbo | Recall: fuel pipe between the high-pressure pump and fuel rail inspected, tightened or replaced | $0 |
| 2022 Santa Fe (11 SUVs built Mar 3-7, 2022) | 2.5L turbo | Recall 22V-197: cracked turbo oil feed pipe replaced | $0 |
What the KSDS update does
KSDS stands for Knock Sensor Detection System. It's free software a Hyundai dealer installs. It listens through the knock sensor for the vibration pattern of a worn rod bearing. If it hears it, the check engine light blinks and the engine drops into a protection mode with reduced power and an RPM cap of roughly 1,800 to 2,000, according to Hyundai and Kia's settlement announcement. Brakes, steering and airbags keep working so you can limp to a dealer.
For the 2.0L and 2.4L GDI settlement, the KSDS update is your ticket to the lifetime warranty. No update, no lifetime coverage. So even if your Santa Fe Sport runs perfectly today, getting KSDS installed is worth a short dealer visit. The warranty sticks with the vehicle, so it matters for second and third owners too.
Easy things to do first
- Run your VIN at nhtsa.gov/recalls. Takes a minute and shows any open recalls.
- Call Hyundai at 855-371-9460 (the number Hyundai gives for recall questions) and ask whether your VIN has KSDS and the lifetime warranty on file.
- Check the oil level and look at the old oil. Low oil makes a weak bearing worse fast. Glitter in the oil is a big red flag.
- Keep your oil change receipts. Claims can be denied for neglect, so records help.
What about a newer Santa Fe?
The 2024 and later Santa Fe isn't listed in any of the Theta II recalls or settlements above. If a 2024+ SUV knocks, take it straight to the dealer while it's under warranty and let them chase it. On the 2021-2022 2.5L turbo, the clues to watch for are a fuel smell, smoke or a burning odor from under the hood, since the recalls there were about fuel and oil pipe leaks, not bearings.
What to ask the dealer
- "Has KSDS been installed on this VIN, and is the lifetime engine warranty on file?"
- "Are recalls 17V-226 or 18V-934 open or complete on my Santa Fe Sport?"
- "If you find bearing damage, is the short block covered under the settlement?"
- "Does the settlement cover my tow and a rental?" (it included reimbursement for some of these costs)
- "Can I get any denial in writing?" Under the settlement, you can dispute a denied claim through arbitration within 60 days, and Hyundai pays the arbitration fees unless the claim is found to be in bad faith.
Is it worth fixing?
If your Santa Fe qualifies, absolutely, because the fix costs you nothing. A fresh short block for a phone call and a dealer visit is a pretty sweet deal on a 10-year-old SUV. If it doesn't qualify and the engine is already knocking loudly, get a written quote and compare it with what the SUV is worth before you commit. A knocking engine doesn't get better with time.
See all our Santa Fe help on the Hyundai Santa Fe page, and if you're also hearing grinding when you stop, read our Santa Fe brake pad cost guide. Recall and settlement details checked October 14, 2026.
