2018 Hyundai Santa Fe Sport: engine failure

Filed Oct 9, 2026 · Engine · CA

My 2018 Hyundai Santa Fe is burning oil and I run the risk of engine failure. I have to check my oil level daily. The mechanic who performed my last oil change said he is seeing this frequently with this age Hyundai Santa Fe. He said Hyundai should be willing to replace my engine but of course they won't. I fear that I am going to be on the freeway and have sudden engine failure creating a risk for me and drivers around me.

Filed Oct 5, 2026 · Engine · WA

While driving over the pass the car suddenly lost power and was running very rough. Luckily there was an exit close by that we took and the engine died on the exit. We were able to get it started and get to a parking lot where it died and would not start again. While trying to start it in the parking lot the check engine light came on. So, after a $375 tow to the nearest town the mechanic discovered a damaged spark plug and the compression test showed 0 psi. The scope showed a hole in the piston. The car also leaks and burns oil. The mechanic recommended scrapping the vehicle since it would not be cost effective to repair it. The mechanic said ours is the 6th Santa Fe in their shop with a blown engine in the past month. It has not been inspected by anyone else.

Filed Sep 15, 2026 · Engine · NE

My 2018 Hyundai Santa Fe Sport (2.4L Theta II GDI, VIN [XXX], approx. 110,000 miles) has suffered a chain of engine and emissions-system failures that create a loss-of-power safety hazard. At about 80,000 miles, Hyundai replaced the original engine under warranty for excessive oil consumption, a defect Hyundai has acknowledged across the Theta II engine family. After only about 20,000 miles on that replacement engine, the catalytic converter failed and set a P0420 code. The vehicle now bogs down, hesitates, and loses power under acceleration. This is dangerous when merging or accelerating into traffic, where a sudden loss of power raises the risk of a collision. A restricted or failing catalytic converter causes exhaust backpressure and abrupt power loss, and the underlying oil consumption also risks low-oil engine damage and stalling. A catalytic converter should last far longer. This premature failure is consistent with the well-documented Theta II pattern in which engine oil consumption contaminates and destroys the converter substrate. It indicates the replacement engine Hyundai installed is itself consuming oil and damaging downstream exhaust and emissions components. I reported this to the dealer and to Hyundai. Hyundai declined to cover the catalytic converter, treating it as unrelated, even though its own warranty engine replacement is the direct cause. I am filing so this safety-related failure is documented. No crash, fire, or injury has occurred. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jun 17, 2026 · Engine · 75,314 miles · MA

The contact owns a 2018 Hyundai Santa Fe Sport. While the contact’s daughter was driving approximately 10 MPH, the vehicle started bucking and shaking abnormally. The warning light indicating that the oil level was low had flashed on the screen. The driver pulled over to the side of the road and waited for the contact to arrive on scene. The contact inspected the vehicle and became aware that the oil level was extremely low. The contact added oil to the engine, and the dipstick failed to indicate the oil level until there was a quart full. The vehicle was taken to a certified mechanic, who diagnosed the vehicle with engine failure and referred the contact to the dealer. While attempting to drive the vehicle at approximately 20 MPH with the hazard light flashing on the highway, the vehicle lost drive power. The contact was able to coast to the side of the road and waited for the vehicle to be towed. The vehicle was towed to the dealer, but the vehicle was not diagnosed or repaired. The contact stated that the failure had occurred after consistent oil changes, and the next oil change was not due for 11 days. The manufacturer was not made aware of the failure. The failure mileage was approximately 75,314.

Filed May 25, 2026 · Engine, Fuel system · KY

2018 Hyundai Santa Fe Sport. Purchased January 2026 took to Oxmoor Hyundai Service Center March 2026. February 2026 began using oil at a measured rate of 700 miles per tank of oil. Used 3 full tanks of oil within the month of February. Oil lights and engine lights on and off and flashing during this time. March 8, 2026, engine light flashed and then stayed on continuously. Engine shook and stuttered and made a loud noise. Engine stalled while I was driving at 35-40 miles per hour. I was able to continue driving to my home with the stuttering and stalling. The next morning I drove it to the Oxmoor Hyundai Service Center. I told relayed the timeline of all symptoms I had experienced over the 2 month lifetime of my ownership. They did not attempt to reproduce the issue. They only entered "shakes in reverse" as the customer provided issue on the intake information. Service Center performed diagnostic, found cylinder misfires on cylinder 2 and cylinder 4. Replaced spark plugs to resolve Cylinder 2. Cylinder 4 continued to misfire. Used Borescope and found broken valve. They did not address the scoring on the cylinder of the valve. Recommended engine replacement. Advised it would not be covered under a warranty because the rod did not break. The oil consumption was proven with documentation from multiple Valvoline visits and the vertical scoring was present on the cylinder with the broken valve in the borescope photo. The Service Center refused to do a Boring Clearance Test or any other test that would prove the engine should be covered under an extended warranty or class action settlement. It wasn't until I reviewed HMA documents uploaded to the BBB Arbitration, that I realized that the information I initially gave to the Service Center of all the symptoms with timelines had not been entered into the system for diagnostic review by Techline. Arbitrator denied my claim under the theta settlement because the rod had not broken yet, BUT she said my engine was defective.

Filed Apr 7, 2026 · Engine, Fuel system · TX

My 2018 Hyundai Santa Fe Sport equipped with a Theta II GDI engine began exhibiting excessive oil consumption, engine knocking, and cylinder misfires consistent with the known Theta II engine defect covered under the Hyundai class action settlement. Prior to the failure, the check engine light illuminated and I experienced repeated misfires and audible engine knocking. The vehicle required frequent oil additions between oil changes due to excessive consumption. The vehicle was taken to an authorized Hyundai dealership where a diagnosis confirmed a burnt valve inside the cylinder head. The dealership recommends replacement of the cylinder head or complete engine replacement to correct the issue. The dealership performed a bearing failure test and attributed the burnt valve to carbon buildup. However, excessive oil consumption in a GDI engine directly accelerates carbon buildup on intake valves, as burning oil deposits carbon on valve surfaces preventing proper seating and causing overheating and valve failure. The carbon buildup is therefore a consequential result of the Theta II oil consumption defect, not an independent cause. The safety risk is significant as engine misfires and knocking while driving create unpredictable loss of power and potential for stalling in traffic. The vehicle is currently not reliably operable. The manufacturer has been contacted regarding coverage under the Theta II settlement. The component is available for inspection upon request at the servicing dealership

Filed Apr 1, 2026 · Engine · FL · crash

I own a 2018 Honda Santa Fe it is using oil so fast. I know that there is other people complaining about the oil consumption so my engine just blew up because I had it changed on March 13 brand new oil change and on Monday night the engine blew up.. The people who changed my oil said that there have been a complaint that they have been using so much oil and I have talked to Hyundai about this and they refuse to do anything Now I have a Hyundai Santa Fe that is no good to me because I personally can’t afford a new engine/motor

Filed Mar 19, 2026 · Engine · IN

I drove 2.5 hours north to a Marine brother's father's funeral, who unexpectedly passed. I started my drive home and made it to Yorktown in about 15 minutes, and the engine light came on, started flashing, and went into limp mode. I pulled over on I-69 to shut it off, pulled the dipstick, and the oil level was full. I pushed the Bluelink button on my rearview mirror, and HMA sent a tow truck to tow the vehicle to a local dealership about 10-12 minutes away. The dealership did not inspect the vehicle until the following Monday, since it was Friday, three weeks ago. The dealership found DTC codes for misfires in cylinders 1 and 2, multiple-cylinder misfire, and too-high pressure in all four cylinders. The vehicle has had the knock sensor replaced, a KSDS ECM update, and a series of gaskets replaced. It has been burning oil since 69,362 miles and is now not operational, 2.5 hours from home. HMA has declined to replace the engine on a vehicle involved in a class action settlement due to problems with several completed replacements. The dealership has followed the manufacturer's process, and, due to the engine not producing a code it had at 87,986, but now not capable due to piston damage, cylinder scouring, and spark plug damage, the manufacturer has declined a goodwill replacement. The engine failure did put others in harm's way, as it did me when having to pull off the busy interstate to inspect the obvious failure. I have been driving a rental since this situation occurred, have a vehicle that is not operational, and a manufacturer that is not assuming responsibility for the catastrophic failure. I have read numerous forums across several platforms about the Theta 2 engines. The vehicle has been serviced as needed, including multiple requests to fix or repair the engine noises it produced, when the oil level became low, and oil had to be added.

Filed Mar 18, 2026 · Engine · FL

I am reporting a serious safety concern involving a 2018 Hyundai Santa Fe Sport with approximately 132K miles. While driving at highway speed, the vehicle suddenly lost power/velocity and the engine light flashed. This created an immediate safety hazard, as maintaining speed is critical in highway traffic. Within seconds, the vehicle regained power and the warning light turned off, giving the impression that the issue had resolved. Shortly afterward, while exiting the highway, the vehicle began shaking and felt as though it would stall but was able to drive home less than one mile. A mechanic retrieved misfire codes for cylinders 2 and 4. Further inspection revealed internal engine damage in cylinder 4 requiring major rebuild. A full deconstruction revealed that one of the valves in cylinder 4 had partially broken. This failure occurred with little to no warning and involved a sudden loss of power at highway speed, which could have resulted in a serious accident. The vehicle’s warning systems did not provide adequate or persistent alerts prior to significant engine failure. Over the last 6 months it began consuming oil frequently requiring weekly checks, however no warning systems or errors to indicate an underlining concern. Based on research, similar Hyundai vehicles have documented issues involving excessive oil consumption and internal engine damage without sufficient warning. This raises concerns about a potential safety defect affecting engine performance and failure detection.

Filed Feb 18, 2026 · Engine · 122,000 miles · IL

The contact owns a 2018 Hyundai Santa Fe Sport. The contact stated that while driving at 55 MPH, the engine made a knocking sound, and the vehicle started shaking before starting to smoke. There was no warning light illuminated. The vehicle was towed to the dealer, who determined that there was a hole in the engine block and that the engine needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure and informed the contact that since Service Campaign: 953 (ECM & Cluster Update) was not completed in a timely manner, the engine replacement was not covered. The contact had not received the notification for Service Campaign: 953 (ECM & Cluster Update) or owned the vehicle when the Service Campaign had started. The failure mileage was approximately 122,000.

Filed Feb 6, 2026 · Engine · NC

Constantly losing oil and there is NO oil leak. Had numerous Oil Consumption Test done. Paid for other unnecessary testing as well. Thousand of complaints on line of other Santa Fe Sports also having the same issue. Hyundai denied a new engine even though dealership recommended it. Also Hyundai Consumer also denied, since corporate told dealership no. Losing 4 quarts of oil, going less than 1000 miles. Let it sit for over a month, then took it back. Now they said I was 2 quarts over. It has the dealership tamper seals on it. Only dealership has been adding oil. Customer Service representative, accused me of adding oil. I asked how do you think I did that? Your Seals are on my car that your dealership out on there. Said it needed an oil change since it was over. Told him that's fine, but I was not paying for it, since they were the only one who out the oil in. So now I am having to do yet another oil consumption test. This was on 2.3.26

Filed Feb 5, 2026 · Engine · TX

engine consumes excessive amounts of oil. we have to check oil every day and add oil even after 30 mile trips. low oil can result in a seized engine which could result in a crash if power is lost in high traffic areas or highway speeds. hyundai knows there is an issue and engines that seize are replaced with the same defective design. this is dangerous and could result in a crash or being stranded in an unsafe area