The short answer
The Theta II 2.4L GDI and 2.0L turbo engines in 2011–2019 Hyundai Sonatas, Santa Fe Sports and Tucsons, and Kia Optimas, Sorentos and Sportages have a well-documented rod bearing defect that starts as a knock and can end in complete engine seizure. There are Transport Canada recalls and a court-approved Canadian class action settlement with a lifetime short-block warranty — so before you pay anyone a dime, including us, find out whether Hyundai or Kia owes you a free engine. If they do not, a tested genuine OEM engine is usually the most sensible fix, and we will walk you through both paths honestly.
Symptoms, from first warning to failure
Faint tick or rattle at cold start
A light metallic tick or rattle in the first seconds after a cold start, especially on a -20 C Edmonton morning, is often the first hint of rod bearing wear. Oil is thick and slow to reach a worn bearing, so the clearance shows up as noise before the engine warms. It may quiet down once oil pressure comes up, which is exactly why people ignore it.
Oil consumption creeping up between changes
Many Theta II engines start using noticeable oil — a litre or more between changes — before any bearing noise appears. Low oil level thins the margin the rod bearings live on. If your dipstick keeps coming up short, treat it as a warning, not a quirk.
Metal glitter in the oil or filter
Fine metallic sparkle in the drained oil, or debris caught in the filter pleats, means bearing material is already circulating through the engine. A shop that cuts your filter open at an oil change can catch this early. It is the cheapest diagnosis you will ever get on this problem.
Knock that grows with engine speed
A deep, rhythmic knock that speeds up with the engine — most obvious under light acceleration or when the engine is loaded — is classic rod knock. On these engines it rarely stays quiet for long. Once you can hear it clearly from the driver's seat, the bearing is well into its failure sequence.
Blinking check engine light with code P1326
If the knock sensor software update (KSDS) has been installed, the computer watches for bearing-wear vibration. When it detects it, the check engine light blinks continuously and stores code P1326. This is the system doing its job — the engine has flagged itself. Get it to a dealer for inspection promptly, because this code is also your ticket into a warranty engine claim.
Engine protection mode — stuck around 1,800–2,000 rpm
Along with the blinking light, KSDS puts the engine into a reduced-power protection mode, limiting engine speed to roughly 1,800 to 2,000 rpm. The car will still move, slowly, so you can get it to a shop. Do not try to live with it or clear the code and carry on — the limp mode exists because seizure may be close.
Loud hammering and low oil pressure warning
A loud metallic hammering combined with an oil pressure light means the bearing is destroyed and the crankshaft is being damaged with every revolution. Shut the engine off and have the vehicle towed. Driving even a few more kilometres can turn a warrantable failure into a seized, unbuildable core.
Sudden stall or seizure while driving
The ugliest version of this failure is an engine that lets go without much warning — a bang or grinding, then the engine stops, sometimes at highway speed. Power steering assist and brake boost fade quickly once the engine dies, so get to the shoulder immediately. This is the scenario the recalls and the class actions were about.
Oil smoke or burning smell after a loud bang
In the worst cases a connecting rod punches through the block and dumps oil onto the hot exhaust, which can cause a fire. If you smell burning oil or see smoke from under the hood after a bang, pull over, shut it off, get everyone out and away from the vehicle, and call for help. Do not open the hood into a possible fire.
Affected models
| Model | Years | Notes |
|---|---|---|
| Hyundai Sonata | 2011–2019 | 2.4L GDI and 2.0L turbo GDI Theta II engines. The 2011–2012 cars were the first recalled (US, 2015) and are the highest-risk years, but the Canadian settlement covers the full 2011–2019 run. Sonata Hybrid is excluded from the Theta II GDI settlement and its lifetime warranty — it uses the port-injected (MPI) version of the same engine family — but 2011–2013 Sonata Hybrids were recalled separately in late 2020 for the same rod-bearing wear, so run your VIN rather than assuming you are unaffected. |
| Hyundai Santa Fe Sport | 2013–2019 | The five-seat Santa Fe Sport with the 2.4L GDI or 2.0T. The three-row Santa Fe XL used a V6, which is not affected by this defect. |
| Hyundai Tucson | 2014–2015, 2019 | Canadian settlement documents list 2014–2015 and 2019 Tucsons with genuine Theta II GDI engines; the US settlement also lists 2018. Coverage on Tucson is engine-specific, so confirm your VIN with Hyundai Canada rather than assuming either way. |
| Kia Optima | 2011–2019 | 2.4L GDI and 2.0T (SX/SX Turbo) Theta II engines. Same engine family and same failure pattern as the Sonata. Optima Hybrid is excluded from the GDI settlement — it uses the port-injected (MPI) version of the same engine family — but 2011–2013 Optima Hybrids were recalled separately in late 2020 for the same rod-bearing wear (with the KSDS update), so run your VIN rather than assuming you are unaffected. |
| Kia Sorento | 2012–2019 | Applies to four-cylinder 2.4L GDI Sorentos. The 3.3L V6 Sorento, common in Canada, is not affected — many Sorento owners can relax. |
| Kia Sportage | 2011–2019 | 2.4L GDI and the 2.0T in the Sportage SX. Kia issued three separate Transport Canada recalls on Theta II vehicles between April 2017 and March 2019. |
What actually goes wrong
The Theta II is the four-cylinder engine family Hyundai and Kia leaned on through the 2010s — a 2.4L direct-injection (GDI) engine in most trims and a 2.0L turbo GDI in the sporty ones. The core defect traces back to manufacturing: machining debris left inside the crankshaft during production could restrict the oil passages that feed the connecting rod bearings. A rod bearing is a thin shell of soft metal that lives on a film of pressurized oil between the crankshaft and the connecting rod. Starve it of oil, even slightly, and it wears metal on metal. That is not a maybe — it is a countdown.
Once a bearing starts to wear, the failure feeds itself. Worn bearing material circulates through the oil and scores other surfaces. Clearances open up, the bearing hammers against the crank journal, and you get the classic rod knock — a deep rap that rises and falls with engine speed. From first audible knock to complete failure can be months or minutes; there is no reliable way to predict it. The end state is a spun or seized bearing that locks the engine, sometimes at highway speed. In the worst cases the connecting rod breaks and exits through the block, dumping oil onto hot exhaust components — which is why this defect carried a fire risk, not just a breakdown risk. Alberta winters do these engines no favours either: cold, thick oil takes longer to pressurize a marginal bearing on start-up, which is why so many of these knocks first show up on frigid mornings.
The recall history is long. Hyundai first recalled 2011–2012 Sonatas in the United States in 2015, then both companies expanded recalls in 2017 to more models and years. In Canada, Transport Canada recalls followed — Kia alone issued three separate recalls on Theta II vehicles between April 2017 and March 2019, and Hyundai Canada ran its own campaigns over the same period. In late 2020, the US regulator NHTSA hit Hyundai and Kia with consent orders and more than US$200 million in combined penalties over how the engine recalls were handled, and the companies settled US class actions valued at roughly US$1.3 billion. This is one of the largest engine-defect sagas in modern automotive history, and it is thoroughly documented — you are not imagining the knock, and you are not alone.
Canada got its own class action settlements, approved by the Ontario Superior Court of Justice in March 2021 for both Hyundai and Kia Theta II vehicles. The headline benefit is a lifetime warranty on the engine short block — the block, crankshaft and its bearings, connecting rods and their bearings, and pistons — for any repair, replacement, diagnosis or inspection connected to rod bearing failure. There is no kilometre cap. The main conditions: the vehicle needs the knock-sensor software update installed, and the warranty can be denied for what the settlement calls exceptional neglect — think years of skipped oil changes with no records. The window to claim cash reimbursement for past out-of-pocket repairs closed in 2021, and a further Canada-wide Hyundai/Kia settlement dealing with engine fire risk was approved in late 2025 with a claim deadline of May 19, 2026, which has now passed. But the lifetime short-block warranty itself continues to travel with eligible vehicles — that part is not a limited-time offer.
The knock sensor update — Hyundai and Kia call it KSDS, Knock Sensor Detection System — deserves a plain explanation, because it is widely misunderstood. It is software, not a repair. The engine's existing knock sensor listens for the specific vibration signature of a rod bearing wearing out. When it hears it, the check engine light blinks continuously, code P1326 is stored, and the engine goes into a protection mode limited to roughly 1,800–2,000 rpm so you can limp to a dealer instead of being stranded — or worse — on the highway. KSDS does not fix the bearing and it does not prevent the failure. What it does is catch the failure early enough that the engine can be replaced before it grenades, and it creates the paper trail that gets your claim approved. Skipping the update is a mistake twice over: you lose the early warning, and you can jeopardize your lifetime warranty eligibility.
Here is the part a lot of owners do not want to hear: when a Theta II bearing fails, engine replacement is the fix. By the time you hear the knock, debris has circulated through the entire oiling system and the crankshaft journals are usually scored. Throwing a set of bearings at the bottom end almost never holds — the underlying oil-passage contamination and crank damage are still there, and the repair comes back. Hyundai and Kia dealers replace these engines with new or updated assemblies under warranty for the same reason. If your car does not qualify for the warranty, your realistic options are a good genuine OEM engine, a remanufactured engine, or a new engine from the dealer at full retail — and the price gap between those three is enormous, which is exactly what the cost section below lays out.
What it costs to fix
Typical ranges in Canadian dollars — every vehicle is quoted individually.
Recall work and warranty engine claim at the dealer
$0
The KSDS software update, recall inspections, and — if your vehicle qualifies under the Canadian settlement's lifetime short-block warranty — a replacement engine are all free at a Hyundai or Kia dealer. This is always step one. Check your VIN on the Hyundai Canada or Kia Canada recall lookup, or call a dealer. If the engine is knocking or the P1326 light is blinking, the dealer inspection is the front door to a no-charge engine.
Independent diagnosis and claim documentation
typically $150–$400
If you want a second opinion before or after the dealer, we can confirm rod bearing noise, inspect the oil and filter for bearing material, and document the engine's condition and your maintenance history so your warranty claim has the best possible footing. Cheap insurance if you are worried a claim might be denied.
Genuine OEM replacement engine, supplied and installed (through Eskimo Auto and Truck Parts)
typically $4,000–$7,000
A tested, mileage-verified genuine OEM Theta II engine typically runs $1,500–$4,000 in Canada depending on year, mileage and availability, plus roughly 12–16 hours of labour, fluids, seals and the odds-and-ends that should be replaced while the engine is out. This is the sensible route when the warranty does not apply. Be picky about the donor — see the FAQ on whether a genuine OEM engine will fail the same way.
Remanufactured engine, installed
typically $7,000–$10,000
A remanufactured long block with updated internals, plus installation. You get fresh internals and usually a longer parts warranty than a genuine OEM engine, at roughly double the price. Worth discussing on a newer, low-rust vehicle you intend to keep for many years.
New OEM engine at the dealer, out of pocket
typically $9,000–$13,000+
A new engine assembly at dealer retail plus dealer labour rates. Very few of these cars justify this spend out of pocket — which is exactly why it matters so much to establish warranty eligibility first, and why the genuine OEM route exists.
Repair it, or replace it?
Step one, every time: run your VIN through the Hyundai Canada or Kia Canada recall lookup and talk to a dealer before paying anyone — including us. The settlement lifetime warranty on the short block has no kilometre cap, so even a Sonata with 280,000 Alberta kilometres can qualify for a free engine if the KSDS update is done and the car was not neglected.
If the warranty covers it, take the free engine. Full stop. A dealer-installed replacement engine on Hyundai's or Kia's dime beats anything an independent shop can offer on price, and you keep the factory paper trail.
If the claim is denied or the vehicle does not qualify — branded title, no service records, missed recall — do the math on the car, not the engine. A rust-free 2015–2019 Sonata, Optima or Santa Fe Sport with a good transmission is still worth meaningfully more than the $4,000–$7,000 a genuine OEM engine swap typically costs, especially at today's used-vehicle prices. That swap usually makes sense.
On a 2011–2013 car with 250,000+ km, visible rust, or other looming repairs, think hard before spending $5,000 on an engine. Sometimes the honest answer is to sell it as a mechanic's special and put the money toward the next vehicle. We would rather tell you that up front than install an engine into a car that owes you nothing.
Do not pay anyone to re-bearing the bottom end of a knocking Theta II. Debris has already been through the oiling system and the crank journals are usually scored — bearing-only repairs on these engines have a terrible track record, and you will pay twice.
If the engine has already seized, do not scrap the car in a panic. Document everything, keep your receipts, and have it towed to a dealer for a warranty decision first. A seized engine with the KSDS update done and oil-change records in the glovebox is still very much a warranty candidate.
How we fix this in Edmonton
Engine Repair & Replacement in Edmonton
A bad engine doesn't automatically mean a new vehicle. We diagnose before we condemn — and then we can fix it every way there is: rebuild it in-house, install a remanufactured ATK engine, or fit a genuine OEM engine sourced through our sister company, Eskimo Auto and Truck Parts.
See the service →Vehicle Diagnostics & Check Engine Light in Edmonton
A trouble code tells you what the computer noticed, not what's broken. We test before we replace anything, because the most expensive repair is the one that didn't fix the problem.
See the service →The genuine OEM parts option
When a Theta II engine lets go and the warranty route is closed, a genuine OEM engine is the fix that makes sense — and that is where our sister company comes in. Eskimo Auto and Truck Parts is one of Edmonton's largest parts operations with a steady flow of Hyundai and Kia donor vehicles, and their genuine OEM 2.4L GDI and 2.0T engines are compression-tested and mileage-verified before they go on the shelf, with a parts warranty behind them. Because Theta II engines are in heavy demand across the country — a lot of them failed, so good donors are scarce — having that inventory in the family means we can usually source the right engine faster than ordering blind from an online broker. If you are in the Edmonton area, we can supply and install the engine as one job; if you are anywhere else in Canada, or you are a shop doing the swap yourself, Eskimo Auto and Truck Parts ships genuine OEM engines nationwide. One honest note: always let us check your warranty eligibility first. If Hyundai or Kia owes you a free engine, we would rather tell you that than sell you one.
Browse inventory at Eskimo Auto and Truck Parts →How to make yours last longer
- Get the recall and the KSDS knock-sensor update done. It is free at any Hyundai or Kia dealer, it gives you an early-warning system against sudden seizure, and it protects your lifetime warranty eligibility. Check your VIN today if you are not sure it has been done.
- Keep every oil change receipt. Warranty claims on these engines live or die on maintenance records — the settlement lets the manufacturers deny coverage for exceptional neglect, and no records looks like neglect. If you change your own oil, keep dated receipts for oil and filters and log the odometer.
- Shorten your oil change interval. These are direct-injection engines prone to fuel diluting the oil, and marginal bearings need every bit of protection. We suggest quality synthetic in the correct spec every 5,000–8,000 km rather than stretching to the maximum the manual allows.
- Check the dipstick monthly. Many Theta II engines consume oil well before they knock, and running a litre low is exactly how a borderline bearing tips over the edge. Top up with the right oil and investigate consumption that gets worse.
- Take any new noise seriously. A cold-start rattle or a light knock under acceleration on one of these engines is not a wait-and-see item. And if the check engine light ever starts blinking, slow down and get to a shop — that is the engine telling you the bearing is going.
- Buying a used 2011–2019 Hyundai or Kia? Before money changes hands, run the VIN for open recalls, confirm the KSDS update and whether the engine was ever replaced, and ask for oil change records. A car with a fresh warranty engine and paperwork is a genuinely good buy; one with a lazy previous owner and no records carries the whole risk.
Frequently asked questions
How do I find out if my Hyundai or Kia is affected by the engine recall in Canada?
Run your 17-digit VIN through the recall lookup on the Hyundai Canada or Kia Canada owner websites, or search the Transport Canada recalls database. Any dealer can also check it in seconds. Affected vehicles are the 2011–2019 Sonata, 2013–2019 Santa Fe Sport and certain Tucsons on the Hyundai side, and the 2011–2019 Optima, 2012–2019 four-cylinder Sorento and 2011–2019 Sportage on the Kia side — but coverage is VIN-specific, so check rather than assume. If the KSDS software update shows as outstanding, book it. It is free and it matters.
Will Hyundai or Kia replace my engine for free?
Quite possibly. Under the Canadian class action settlements approved in 2021, eligible Theta II vehicles carry a lifetime warranty on the engine short block — block, crank, rods, bearings and pistons — for rod bearing failure, with no kilometre limit. The practical conditions are that the KSDS software update is installed and that you can show reasonable maintenance; the settlement lets the manufacturer refuse claims for exceptional neglect. If your engine is knocking or has failed, have it towed to a dealer and open a claim before paying for anything. We routinely tell customers to try this first, because a free engine beats anything we can sell you.
My check engine light is blinking and the car will not go over 2,000 rpm. What is happening?
That is the knock sensor detection software (KSDS) doing exactly what it was designed to do. It has detected the vibration signature of a wearing rod bearing, stored code P1326, and put the engine into a protection mode limited to roughly 1,800–2,000 rpm so you can get to a shop without the engine seizing on the highway. Do not clear the code and keep driving, and do not let anyone talk you into just replacing the knock sensor. Drive it gently to a dealer — or tow it if the knock is loud — because this exact scenario is what the lifetime warranty was built for.
How much does it cost to replace a Hyundai or Kia 2.4 engine in Canada if I have to pay myself?
Honest ranges: a tested genuine OEM engine installed typically lands around $4,000–$7,000 all in, depending on the engine's price and what else needs replacing during the swap. A remanufactured engine installed typically runs $7,000–$10,000, and a new engine at dealer retail can exceed $9,000–$13,000. Labour alone is usually 12–16 hours. Those numbers are exactly why we push every customer to exhaust the warranty route first — and why genuine OEM engines from our sister company, Eskimo Auto and Truck Parts, are the most common fix we actually perform on these cars.
Was there a class action in Canada, and am I too late?
Yes — the Ontario Superior Court approved Canadian settlements for both Hyundai and Kia Theta II vehicles in March 2021. The window to claim cash reimbursement for past repairs closed in 2021, and a further Canada-wide settlement dealing with engine fire risk had a claim deadline of May 19, 2026, which has now passed. But the piece that matters most going forward — the lifetime warranty on the short block for rod bearing failure — is not a claim you missed; it stays with eligible vehicles. If your engine fails tomorrow, you pursue it through a dealer as a warranty claim, not through the courts.
Why was my warranty claim denied, and is that the end of it?
The common denial reasons: the KSDS update was never installed, there are no oil change records (the exceptional neglect exclusion), the vehicle has a branded title, the failure is judged unrelated to rod bearings, or the damage got worse because the car was driven long after the knock started. A denial is not always final — go back with complete records, ask for the denial in writing with the specific reason, and escalate to Hyundai or Kia Canada customer care. We can help by documenting the failure mode independently. And if the denial sticks, that is when a genuine OEM engine becomes the practical path.
Will a genuine OEM engine just fail the same way?
It is a fair concern, and we will not pretend otherwise: a genuine OEM Theta II engine came out of the same production era, and some donors carry the same defect. That is why the donor matters. A good genuine OEM engine is one that has been compression-tested and inspected, comes with verified mileage, ideally from a later production year or a vehicle that already received an updated replacement engine under the recall program. We are honest about this trade-off: a genuine OEM engine does not carry Hyundai's lifetime warranty — only the supplier's parts warranty — but it is usually the right call on a car the factory will not cover.
Is the 2.0 turbo engine as bad as the 2.4?
Both are Theta II GDI engines and both are covered by the recalls and the Canadian settlement — the rod bearing defect is not exclusive to the 2.4. The 2.4L GDI in base and mid trims accounts for most of the vehicles and most of the failures we see, simply because it sold in far greater numbers. The 2.0T in Sonata, Optima SX, Santa Fe Sport and Sportage SX runs higher cylinder pressures, so a wearing bearing there does not last longer. Treat a knock in either engine the same way: stop driving, check warranty coverage, then decide.
Should I avoid buying a used 2011–2019 Sonata, Optima or Santa Fe Sport altogether?
Not necessarily — these can be genuinely good value used cars precisely because the engine saga scared the market. The trick is buying the right one. Best case: a car whose engine was already replaced under the recall program with a documented updated engine, plus service records. Acceptable: original engine, KSDS update done, full oil change history, no noise on a cold-start listen. Walk away from: no records, an outstanding recall, any tick or knock, or a seller who will not let you get a pre-purchase inspection. We do those inspections, and on these particular cars they are worth every dollar.
Dealing with this problem right now?
Edmonton and area: bring it in and we'll confirm the diagnosis before any work. Anywhere else in Canada or the USA: our sister company ships the genuine OEM parts to your shop.