2020 Hyundai Santa Fe power train problems

“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…”

“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.”

“The contact owns a 2020 Hyundai Santa Fe. The contact stated that while driving at an undisclosed speed, the accelerator pedal was depressed; however, the vehicle failed to accelerate as intended. The contact stated that the vehicle lunged forward. In addition, the vehicle almost stalled. No warning lights were illuminated. The vehicle was taken to the dealer; however, the failure was not duplicated. The contact was informed that no fault codes were displayed. The contact was informed that the issues with the vehicle were just a case of bad luck. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The contact stated that the failure had occurred shortly after the vehicle was repaired under Technical Service Bulletin: 9C2, in May 2026. The manufacturer was made aware of the failure, and a case was filed. The failure mileage was approximately 74,558.”

“The contact owns a 2020 Hyundai Santa Fe. The contact stated that he received an unknown service campaign from the manufacturer indicating that a software update for emissions was needed. The vehicle was taken to a dealer where an ECU update was completed and an NP001-SC9C2 was installed for the engine and transmission. The contact stated that when his wife drove the vehicle home from the dealer, she noticed that something was wrong with the vehicle but did not specify the failures. The contact stated that the next day, while driving at an undisclosed speed, the vehicle hesitated and shifted improperly, and while depressing the brake, the vehicle accelerated forward. The contact stated that the failure persisted and became more prevalent in the morning after sitting overnight. The vehicle was then taken to the same dealer where a shift engine value reset, transmission value reset, shift adaptations were made (Part number 95447-6G200). The vehicle was repaired, but the failure reoccurred the next morning and has persisted every morning thereafter. The manufacturer was notified of the failure and a complaint was filed. The failure mileage was approximately 25,051.”

“I was driving on the road and all of the sudden my car went limp and would only move 45 miles per hour. I took it to the dealer which I have lifetime powertran on my car. It has been there for over a month at the dealer. They asked me to provide all oil changes,services, and registrations. I did that and then fidelity asked them to tear down the engine again to see if I had carbon build up. Then after the dealer did that they ask the dealer to tear the motor down even further to see if the exhaust valve was bad and if it was bad they would not replace my motor. My car consumed so much oil that I was changing my oil so often. I have been renting a car just to get back and forth to work. In my contract it says that the exhaust valve is covered under my lifetime powertran. I feel like hyundai and fidelity are giving me the run around. I took very good care of my car and I have shown that. Hyundai has had alot of problem with there motors with the oil consumption and motors just going limp. I feel I will never buy a hyundai again. I am losing money everyday because of the dealer and fidelity. I need the motor replaced and it was no abuse on my part I took care of…”

“Transmission issues with DTC light coming on, dealership did software update which did not resolve the problem. Transmission has rough shift and shuddering. Dealership is recommending complete transmission replacement.”