What 939 owners told NHTSA about the 2017 Hyundai Santa Fe Plug-in Hybrid

After going to the Hyundai dealership for them to perform Service Campaign SC2 on 6/10/26, the engine is a little jumpy for the first minute or two of driving, especially low speeds through my neighborhood.

NHTSA ODI 11749509

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 NHTSA 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.

NHTSA ODI 11749634

Hyundai Campaign 9C2 recall update: Took my vehicle in to have the Hyundai Campaign 9C2 recall update performed on the vehicle on June 9th, 2026. Since the update the vehicle is hesitant/jerky upon first drive of the day or anytime it sits more than a few hours. Occasionally it will do this while I am driving. I feel it is a saftey risk because this could cause my vehicle to abruptly hesitate without braking and cause someone to hit me, or worsetransmission to fail while at highway speeds. I took it back to the dealer that performed the required update around june 23rd 2026 and informed them of the problem caused by the 9C2 campaign update.I got the we don't know anything about it causing problems runaround. Even though it has been documented that dealers were notified of this problem. They then wanted to charge me a $100 diagnostic fee to see if it might be something else, I declined that because I know it is from this update. My vehicle ran perfectly fine and smooth before this update was applied and no CEL lights are on. I did this update because it was required to be done by Hyundai. When I started researching why my vehicle was hesitant/jerky after the update is when I found that anyone that did this update is having these same issues, and it has been happening for a while now and Hyundai corporation has done nothing to correct this problem other than tell us to sit for at least 3 minutes or more before driving it. That does not help when it does it even after driving for a bit and possibly creating transmission problems.

NHTSA ODI 11748778

The contact owns a 2017 Hyundai Santa Fe. The contact stated that while driving approximately 15 MPH on the interstate, the contact heard an abnormal tumbling sound coming from underneath the vehicle. The contact noticed an unknown object had detached from the vehicle. Upon inspection, the contact determined that the detached component was the radar sensor. The Automatic Emergency Braking (AEB) system and the adaptive cruise control became inoperative. The contact stated that the vehicle had not been involved in a crash prior to the failure. The vehicle was taken to an independent mechanic for inspection. The mechanic advised that the radar sensor could not be reattached and stated the failure was possibly caused by a crash. The local dealer was contacted, but the vehicle was neither diagnosed nor repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 130,000.

NHTSA ODI 11748721

Airbag light on. La Quinta Hyundai verified light on scanned codes found active b134800 Driver airbag resistance circuit short to ground 1st stage. Testing found clock spring issue internal fault. Since this clock spring is related to driver airbag, & horn, it would seem that this would be a safety hazard that would be under warranty. The extended warranty (Z01) that I received from Hyundai doesn’t cover my problem.

NHTSA ODI 11748248

We are driving on the highway and the engine just stop working but all lights are still working. I am trying to put gas but it seemed that the engine completely shuts off dangerously without warning. This put my family at risk because there were a lot of big trucks beside us. Theta II 2.0L Turbo engine just stalled I believe this has been around . Can you please help us.

NHTSA ODI 11747482

The contact owns a 2017 Hyundai Santa Fe. The contact stated that after an unknown Emission recall was performed on the vehicle, the vehicle started sputtering at start-up and then while driving. There was no warning light illuminated. The dealer was notified of the failure and informed the contact that it was a known failure after the Emission recall repair. The contact was informed that the manufacturer was working on a fix for the issue. Additionally, the contact was advised that the recall repair was optional, but the contact had opted to have the vehicle repaired under the recall. The manufacturer was contacted several times, but no assistance was provided. The failure mileage was approximately 78,000.

NHTSA ODI 11747342

Hi, I have a 2017 Hyundai Santa Fe sport and I recently went to the dealership to get my brakes done and that day they did the recall 9C2 which is a software update on the engine/transmission and the next morning when I drove my car the rpm’s were going up and my mph wouldn’t go past 15 mph for about a block down the road and the car jerked two times and then drove like normal. I call the dealership let them know about the issue and it’s never been an issue in the past and they set up a appointment I come in and they tell me if it’s not related to the brakes then I’ll have to pay $250.00 for a diagnosis test. Unbelievable I don’t believe this is a coincidence I have taken well care of my car and the past owner as well and the car doesn’t even have 100k miles. I have researched other people in the same situation as me and even read that Hyundai is recommended us to warm up our cars before driving now. It is so frustrating my car was perfectly fine until that recall and they won’t do anything about it.

NHTSA ODI 11746619

vehicle serviced on 5/7/2026 for Hyundai service campaign 9C2 immediately after noticed car was not driving as it had been prior to this update, sluggish acceleration on start, chugging and then rapid sudden acceleration. returned to service dept May19. Diagnostics revealed no issues, problem persisted. returned to service dept. May22. Informed Hyundai was looking into this issue related to the 9C2 update and awaiting a new update to fix the problem. As of todayJune15 there has been no action to remedy the problem. Do not feel safe driving a vehicle that hesitates when starting to drive and then accelerates roughly. this has happened consistently upon cold start up thus far but concerned it may happen while in traffic or at other times and result in an accident.

NHTSA ODI 11744314

Overview Over approximately six months, I reported persistent drivability concerns to Hyundai on Perryville — specifically hesitation, engine trembling, power loss on acceleration, and eventually a flashing check engine light, particularly when the engine was cold. Despite multiple dealership visits and over $1,500 in out-of-pocket expenses, the root cause was not identified until my fifth visit: a clogged catalytic converter. Hyundai Motor America determined the repair was not covered and declined to explain the diagnostic basis for that decision. When I sought a second opinion at an independent shop (recommended by the dealership), that shop ignored my explicit instructions not to drive the vehicle, drove it, and the car broke down in their care. Their own invoice now states the vehicle needs a new motor. I am filing this complaint to document the full pattern of negligence, misdiagnosis, and failure of care by both parties.

NHTSA ODI 11743838

My wife was driving our 2017 Hyundai Santa Fe around March 8, 2023 with our 3 children in the vehicle. She began merging onto interstate 70 when the vehicle made a noise and became undriveable. She could still steer but pushing the pedal down did not do anything. She had to carefully pull over off of the highway so that she did not get in an accident. This vehicle had to be towed to a mechanic who said the engine had seized up and that the oil is gone from the engine and that I would need to have it sent to a Hyundai dealer. This vehicle had 108,334 miles on it so it was just past Hyundai's 100,000 mile warranty. This vehicle was towed to a Hyundai dealer who confirmed that the engine was locked up and that an oil sample found metal in the oil. The dealership recommended to replace the engine with a used one for over $11,000 which I declined then charged me $160 for evaluating. No warning lights or indicators were ever showing any issues. We did notice sometimes after an oil change that they would state on the invoice that the oil was a half quart low. This vehicle was parked in a garage and never had a drop of oil leak. Hyundai recently extended the warranty for this vehicle to 150,000 miles and then declined my repair claim due to the repair not being done at a dealership. The sudden loss of power while driving was a scary incident for my family but thankfully no one was hurt.

NHTSA ODI 11743206

See attached document for complaint.

NHTSA ODI 11743251

I was told my top side of my engine failed, and they only cover bottom side engine failure. As well as pieces was missing. When I looked at the video it showed that my screws has fell off vs removed.

NHTSA ODI 11742869

The engine burns oil fast. You have to replace oil on a regular bases. The car also looses fluids fast as well. This causing the engine to over heat. This causes the cylinder to head blow.

NHTSA ODI 11743064

Air compressor and compression failed engine diagnostic test. Vehicle had high oil and gas consumption.

NHTSA ODI 11742268

Hi, my name is [XXX], i bought used Hyndai Santafe sport 2017 from dealership in 2020. It had around 47,000 Miles on it, intitially it was running fine but after driving 2 years i discovered that engine is burning oil and after the oil change right after 1000 miles i had to add a quart of oil and it was like every two weeks. I had many srevices from dealership and other auto mechanic stores but it didn't improved. I had no choice but to keep driving the card on XXX th the engine crashed with out any sign on dashboard. There was slight noise and it increase by the way car was parked on the side road from Highway. The car was towed to my local mechanic and confirmed that engine is crashed. After i had to towed to dealership and i am still waiting for their response. Now we have put 43,000 miles in 6 years (91,000) total mileage. I had bought the waranty from dealership by $ 2500 which expired in 2025 Currently no warranty. My question here is that the car is still under 100,000 and engine failed. What if the dealership refuse to replace the engine. What are my leagal rights. Thanks [XXX] [XXX] [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ODI 11742118

My vehicle experiences severe, unpredictable harsh downshifting/surging when slowing down, specially from 3rd to 2nd and 2nd to 1st gear. The transmission kick causes unexpected vehicle hesitation and deceleration changes in active traffic: presenting an immediate crash hazard. The dealership head technician has physically test-driven the vehicle and confirmed the failure. However, Hyundai Corporate is refusing to replace the failing transmission under 10 years/100,000 mile warranty because the vehicle's computer has not yet thrown an electronic error code. The manufacture is actively trying to force me to drive an unsafe vehicle until the transmission completely fails in traffic, putting my family and other drivers at severe risk. May 28, 2026 currently milage is around 88,000. The dealership currently has the vehicle.

NHTSA ODI 11740634

reporting a serious safety concern involving my 2017 Hyundai Santa Fe Sport with the Theta II engine. While driving on the highway, my vehicle suddenly lost power without warning. The vehicle became unsafe to drive and I had to pull over and have it towed. There was no warning light before the failure. The vehicle has been regularly maintained. Hyundai later stated there was internal engine damage. My vehicle also shows an open engine-related recall/campaign since November 2025. I have found many similar complaints from other Hyundai owners describing sudden loss of power, excessive oil consumption, and engine problems involving the Theta II engine. I contacted Hyundai Motor America and provided documentation and videos, but I have not received a meaningful response. I am concerned this issue may represent a serious safety defect because the sudden loss of power occurred while driving on a highway.

NHTSA ODI 11740312

The engine in my 2017 Hyundai Santa Fe Sport equipped with the 2.4L Theta II GDI engine is experiencing severe excessive oil consumption. The vehicle consumes approximately 2–2.5 quarts of oil every 1,000 miles despite multiple repair attempts and dealership-performed combustion cleaning procedures. Hyundai Motor America and the dealership documented the condition under PA #[XXX] and recommended engine replacement. Hyundai Motor America advised me in writing that the vehicle should not be operated in its current condition because of the excessive oil consumption and pending engine replacement. Excessive oil consumption creates a risk of sudden engine failure, engine seizure, stalling while driving, and potential engine fire if oil levels drop unexpectedly. Because the engine rapidly loses oil between normal service intervals, the vehicle may become unsafe to operate without warning, placing myself, passengers, and other motorists at risk. The defect was confirmed multiple times by Capital Hyundai in San Jose, CA through two official Hyundai oil consumption tests. The dealership documented oil consumption of approximately 2–2.5 quarts per 1,000 miles and submitted the results to Hyundai Motor America under PA #[XXX].The dealership also performed multiple repair attempts, including spark plug replacement, fuel induction cleaning, combustion chamber cleaning, and repeated oil changes, but the excessive oil consumption continued. Prior symptoms included: Check engine light illumination, Cylinder #4 misfire condition, Engine noise, Excessive oil loss between oil changes, and Oil level dropping significantly within short mileage intervals. The check engine light and misfire condition first became severe enough to require dealership diagnosis on or around [XXX], when the vehicle was towed to the dealership. The excessive oil consumption issue was formally documented beginning [XXX] during Hyundai’s oil consumption testing process. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ODI 11739834

After the installation of the Service Campaign 9C2 engine update, the car now seems to surge or rev up briefly at lower speeds like it can't find the right gear or is trying to briefly accelerate. It doesn't seem to be as noticeable at highway speeds, but in residential or low speeds, it's very noticeable and a little unsettling as the car feels like it wants to briefly lunge forward. No lights are on the dash and there is no indication of any malfunction, but it did not behave this way prior to the 9C2 engine program update. I waited for a couple weeks before contacting Hyundai Corporate about this issue because I was hoping maybe the transmission or engine was relearning after a battery disconnection, but it has not gone away.

NHTSA ODI 11738814

I am submitting a complaint regarding a turbocharger failure on my 2017 Hyundai Santa Fe VIN [XXX] . The vehicle experienced turbocharger-related failure symptoms including loss of power and drivability concerns. This created a potentially dangerous situation because the vehicle was unable to accelerate normally and could have caused difficulty merging into traffic or maintaining safe roadway speeds. I contacted Hyundai Motor America requesting assistance with repair coverage. Hyundai denied assistance solely because the vehicle was outside the warranty period by time and mileage, despite the seriousness of the failure. I am concerned this issue may be related to broader engine or oil-related defects reported in Hyundai vehicles, including possible oil starvation, excessive oil consumption, or internal engine contamination that could contribute to turbocharger damage or failure. I believe this condition may represent a safety-related defect because sudden power loss during operation increases the risk of a crash. I request that NHTSA review this issue and investigate whether similar turbocharger or related engine failures are occurring in 2017 Hyundai Santa Fe vehicles. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ODI 11738896

The contact owns a 2017 Hyundai Santa Fe. The contact stated that the vehicle was using an excessive amount of oil. There were no warning lights illuminated. There was no indication of a leak. The local dealer was contacted, but the vehicle was not diagnosed or repaired. The dealer informed the contact the failure was related to combustion chamber cleaning. The manufacturer was contacted, who informed the diagnostic fees were at her expense and there was no coverage. The failure mileage was approximately 94,700.

NHTSA ODI 11736987

After conducting Hyundai Service Campaign 9C2 for an emission update, vehicle now lunges and lags when accelerator is depressed. Symptoms tend to be more present soon after vehicle is started and reappear less often after the vehicle engine is at optimal temperature. This problem was not at all present prior to the service campaign update. The vehicle had no warning lights prior to the service update. This problem causes a safety issue when acceleration is not consistently present in a time of lane merging and turning onto higher speed roads. There are no warning lamps on the vehicle currently. Hyundai customer service was contacted about problem and I requested to remove the campaign update as this safety problem was not present prior to the update. Hyundai would not attempt to do this and required me to pay a diagnostic fee of several hundred dollar to troubleshoot the source of the problem. I declined.

NHTSA ODI 11737161

The contact owns a 2017 Hyundai Santa Fe. The contact stated that while driving at an undisclosed speed, the air bag warning light illuminated and remained on, despite no accident occurring. The vehicle was taken to an independent mechanic who could not determine the failure and advised the contact to visit the dealer. At the dealer, the vehicle was diagnosed with a failed passenger air bag inflator that needed replacement. The dealer also found that the SRSCM (Supplemental Restraint System Control Module) required replacement due to the part shorting the inflator. The airbag was replaced, but the dealer refused to replace the SRSCM as it was no longer under warranty. The manufacturer was not notified of the failure. The failure occurred at approximately 77,000 miles.

NHTSA ODI 11736061

Engine seized up on the interstate. Vehicle has ~97,000 miles. Towed to dealership. Dealership wanted $8,000+ to replace engine. Hyundai refused to honor their warranty of 15 years/150,000 miles. Remains at the dealership, unrepaired.

NHTSA ODI 11735603