Hyundai Santa Fe knocking problems

Filed Sep 2, 2026 · Driver assistance, Engine · FL

Hyundai Motor America & Wallace Hyundai of StuartVEHICLE: 2020 Hyundai Santa Fe (2.4L Theta II GDI Engine)VIN: 5NMS23AD5LH181669INCIDENT MILEAGE: 181,000 MiHYUNDAI CASE NUMBER: 42981944SECTION 1: CATASTROPHIC INTERSTATE SAFETY INCIDENTOn July 16, 2026, while navigating heavy, high-speed traffic on Interstate 95 (I-95) at approximately 80 to 85 MPH, my vehicle suffered an un-commanded, catastrophic mechanical engine seizure. The vehicle instantly dropped from highway speeds down to a 21 MPH "limp mode," creating an immediate multi-car pile-up hazard on a major interstate. Physical inspection immediately after the failure proved that the engine oil level was completely full. The internal components catastrophically failed due to a documented, systemic factory defect involving premature rod bearing failure and oil starvation mechanisms, entirely unrelated to consumer maintenance.SECTION 2: PRIOR SAFETY COMPLAINTS & DOCUMENTED TIMELINEHyundai Motor America has intentionally forced me to operate a known, life-threatening safety hazard for 17 months, during which I drove an additional 31,000 miles under extreme duress. I filed formal oil consumption complaints with Hyundai Corporate every three to four months. I was forced to manually replenish the engine oil every 1,000 miles due to excessive oil loss.Specific safety reports detailing hazardous engine behavior were formally logged with Hyundai on November 25, 2025, and again in April 2026. Rather than remediating the vehicle, Hyundai corporate claims adjusters and dealership supervisors ignored these warning tracks, effectively throwing a consumer out into active traffic in an unsafe, defective vehicle.SECTION 3: AUTOMATIC SHUTDOWN TRAUMA & ACCIDENT RISKThe manufacturing defects caused an intermittent, un-commanded automatic The manufacturing defects caused an intermittent, un-commanded automatic engine shutdown condition. On 5 to 10 separate occasions while stationary at active traffic lights, the vehicle stalled10times

Filed Aug 31, 2026 · Engine, Transmission · NY

My car is consuming an immense amount of oil, the manufacturer recommends oil changes every 7,500 miles, I get an oil change less than 3,000 miles and on my last oil change i was told that there are oil shavings in my oil filter. I just got the SC9C2 update and now my engine is knocking. Car drives super rough and has signs of rod bearing failure. My engine is the Theta II 2.4GDI, a class action lawsuit was filed against Hyundai but my car wasn't included. I don't understand how Hyundai can know about this issue with this engine and not cover replacement. A car should at the very least last for the life of the loan, I am going to end up with no car and still making payments.

Filed Aug 24, 2026 · Electrical, Engine · NJ

My 2017 Hyundai Santa Fe, purchased new from Lynnes Hyundai in February 2017, has approximately 93,000 miles. The vehicle previously developed a significant oil-consumption/engine problem that was diagnosed by Hyundai, and Hyundai replaced the engine with a remanufactured engine. Approximately two weeks after the engine replacement, the check-engine light illuminated and DTC P1326 was identified. The dealership replaced the knock sensor. Approximately two weeks later, the check-engine light illuminated again with a recurring P1326 condition. The vehicle is currently at Lynnes Hyundai and has been there approximately three weeks while they attempt to determine the cause. Hyundai Techline is involved. Prior to the current repair visit, while traveling approximately 60 mph, the vehicle experienced a very forceful hesitation that jerked the vehicle. I immediately slowed down and pulled onto the shoulder. The vehicle continued to hesitate intermittently while I drove slowly to safety. I was concerned that the vehicle could lose power or shut down while I was driving at highway speed, creating a risk of a crash. The recurring P1326 condition has been confirmed by the Hyundai dealership. The vehicle and engine have been inspected by Hyundai/Lynnes Hyundai multiple times, including after the engine replacement. The current recurring condition has not been resolved. The check-engine light is the warning lamp associated with the current condition. I do not know the underlying cause of the recurring P1326 condition; Hyundai is currently attempting to diagnose it. The vehicle is currently available for inspection at Lynnes Hyundai.

Filed Jul 21, 2026 · Engine · FL

Driving on highway no warning lights appeared the car made a loud pop noise and heavy smoke appeared from under the hood. Immediately pulled over and noticed all of the oil poured out and was nasty looking. The car was up to date on oil change. My car was towed home and bone dry no oil and no coolant the engine now had loud knocking and needs to be replaced for failure. The car was looked at by independent mechanic. Miles on the car are 152010. I had no warnings and up until the issues the car was serviced and cared for.

Filed Jul 12, 2026 · Engine, Fuel system · GA

COMPLAINT SUMMARY: [XXX] / ENGINE THERMAL FIRE RISK / WARRANTY DECEPTION My 2019 Hyundai Santa Fe (2.4L GDI Engine) is experiencing severe powertrain degradation under the known Theta II engine defect class-action framework. On November 7, 2025, the vehicle logged a Permanent Diagnostic Trouble Code (DTC) P1326 via an independent scan, indicating catastrophic internal rod bearing wear. On XXX, the vehicle was brought to Hyundai of Milledgeville for safety recall verification. Instead of executing the mandatory corporate-directed Bearing Clearance Test (BCT) to replace the failing engine block, the service department committed technical campaign malpractice. The technician forced the 9C2 ECU Software Update directly over the locked mechanical fault to suppress the dashboard warning lights and alter the vehicle's ROM ID parameter limits. When caught via a photograph of their active GDS diagnostic tablet showing 7 historical system faults, the service manager provided a truncated printed report hiding Page 1 and omitting the critical P1326 powertrain code count to evade a warranty engine replacement. Due to these unmitigated delays, the vehicle has suffered severe consequential safety damage. The advanced engine degradation and oil consumption have flooded the exhaust system, melting the catalytic converter substrate and triggering a new DTC P042000 (Catalyst Efficiency) fault immediately after the dealer visit. The extreme engine vibrations have also damaged the transmission's torque converter clutch (DTC P074100). The dealership refused a service loaner and knowingly sent a disabled consumer and an elderly passenger away in an active, failing vehicle that presents a sudden stall-on-highway hazard and a severe thermal exhaust fire risk under extreme summer heat conditions. Hyundai Motor America Corporate has failed to provide emergency towing or alternative mobility accommodations despite a registered corporate case file. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(

Filed Jul 10, 2026 · Transmission · VA

The vehicle is in limp mode and is displaying a flashing check engine light with a P1326 powertrain code. The vehicle in question is a 2017 Hyundai Santa Fe Sport equipped with a Theta II 2.4L GDI engine at 118,000 miles. Per the service campaign T3G, listed on the federal safety agency website, this vehicle is covered under warranty repair since it is a Theta II engine vehicle that is displaying an active P1326 power train code. The vehicle is under he 10 Year/120,000 miles limitations of the extended warranty. The dealer just submitted to us a quote to repair the vehicle and is stating that none of the repairs listed are covered under warranty. This includes a quote to replace the engine knock sensor, which is a warranty item under the T3G service campaign’s extended warranty.

Filed Jun 22, 2026 · Engine · NM

On June 16, 2025, I dropped my 2012 Hyundai Santa Fe GLS (VIN: [XXX]) off at Larry H. Miller Southwest in Albuquerque, NM for the federal safety agency safety recall #20V746000 (Theta II engine connecting rod bearing failure). It has now been over one week with zero communication from the dealership regarding the status of my vehicle. When I attempted to follow up by phone I was unable to reach anyone in the service department. Upon calling Hyundai corporate customer service I was informed that the dealership had a name discrepancy in my paperwork and my owner profile was not linked to my VIN in their system. The recall work has not begun. I was given a corporate case number but was told to call back the following day to check in rather than receiving a callback. The burden of all follow up has been entirely on me. This is my only vehicle. I have been without transportation for over a week affecting my ability to get to work. No loaner or rental vehicle has been offered or provided. My vehicle was brought in specifically for a federal safety recall involving a known engine defect that can cause fire or engine stall. The dealer’s handling of this recall has been completely unacceptable and I am requesting the federal safety agency intervention to ensure compliance. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jun 11, 2026 · Engine · NY · crash

WHAT FAILED: The engine — the 3.3L Lambda II GDI V6 (engine family GHYXV03.31XE per the federal emissions label) — failed catastrophically: a connecting rod penetrated the engine block. The failed engine IS available for inspection on request. It has been preserved unrepaired since the failure, the rod penetration of the block is externally visible, and the vehicle is currently at Niagara Hyundai in New York. WHAT HAPPENED / SAFETY RISK: On [XXX], I was driving at approximately 65 miles per hour on [XXX] southbound near Bath, New York, with four occupants aboard, when the engine failed suddenly and without warning — no warning lamps, messages, or symptoms preceded it. The vehicle immediately lost all motive power at highway speed. I was forced off the roadway and through brush and debris to bring the vehicle to a stop. The sudden total loss of power at highway speed created an immediate loss-of-control hazard to my occupants and to surrounding traffic. CONFIRMED BY OTHERS: The tow was dispatched through a 911 emergency call. A New York State Trooper was at the scene and observed the debris trail. The towing company's invoice (T&R Towing and Service, Call #[XXX], [XXX]) records "Break Down," winch recovery, vehicle not drivable, and the tow operator's handwritten condition description: "Motor go Boom." The vehicle is now in the possession of a Hyundai dealership (Niagara Hyundai), and Hyundai Motor America has an open case (#[XXX]); however, Hyundai has refused to inspect or diagnose the engine unless I first pay to repair unrelated damage, so the manufacturer has NOT yet inspected the failure — leaving this safety defect undiagnosed by Hyundai. RELEVANT BACKGROUND: In 2024, Hyundai issued warranty extension TXX8 (15 years / 150,000 miles) for connecting rod bearing failure in this exact engine, acknowledging the failure mode. Mileage at failure was under 100,000 miles. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jun 6, 2026 · Engine · GA

I filed a complaint when the first engine seized. It's a miracle we got off the road safely that day. While it was at the dealership, the engine was replaced with a used engine and covered by my extended warranty from Vroom. I believe the cost was approximately $14,000. I was told the engine had around 30,000 miles on it. I've put around 20,000 miles on this engine and the same thing happened again. This time, the engine had been knocking for a few months. When it started knocking, I took it to the dealership because the new extended warranty by Hyundai was in effect and I assumed it would be covered. Immediately, Autonation Hyundai in Savannah, GA said it would not be covered because it was a used engine. I don't understand why when the engine can be traced and the mileage known by the number on the engine. On XXX, my [XXX] granddaughter took her driving test in the vehicle. About 2 hours later, the engine seized with her driving. We were on the same road and it was about the same time of day. Once again, it was a miracle we got off the road safely. I just talked to Hyundai and we'll see what they say. From the stories I've seen, they'll do anything they can to avoid covering these engines and they get away with it. The people who get hurt the most from this are the ones who can least afford it. I'm a [XXX] widow raising my 5 grandchildren by myself and believed I was getting a good vehicle, mainly due to the report by Consumer Reports magazine. Even after the first engine failed and was replaced, I still wasn't in a financial position to get another vehicle and assumed if something happened again, it would be covered under the extended warranty Hyundai was made to provide. Obviously, that means nothing. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jun 5, 2026 · Engine, Transmission · PA

My 2019 Hyundai Santa Fe 2.4L (VIN: [XXX]) is experiencing a severe safety defect involving rapid engine oil starvation. The vehicle recently failed an official oil consumption test conducted by Fred Beans Hyundai of Abington, where it was documented that the engine consumed 1 quart of oil in just 881 miles (PA Request #XXX). This vehicle is equipped with the Theta II engine, which currently has active warranty extensions (TXXC and TXXI) specifically covering connecting rod bearing failure. Despite the documented severe oil loss—which is the primary known cause of connecting rod bearing wear and sudden engine seizure—Hyundai Corporate (Case #XXX) is refusing to evaluate the vehicle under these warranties. They have improperly classified my claim as a denied "goodwill" request and are refusing to perform a connecting rod bearing clearance test to determine if the bearings have been damaged by this starvation. Because Hyundai refuses to perform the required diagnostic safety protocols, the vehicle must be driven in an oil-starved condition. This poses an imminent and severe safety risk of sudden engine seizure, stalling, and complete loss of motive power at highway speeds without warning, which could result in a catastrophic crash. The manufacturer is ignoring their own failure thresholds and putting driver safety at risk. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)