2017 Hyundai Santa Fe Sport engine problems

Filed Oct 15, 2026 · Engine · IN

Started car to reverse out of parking space and it started jerking as I accelerated. Drove jerkily the few blocks I had to go to make it home. Did not drive again but upon starting it the check engine light came on. Contacted Hyundai customer care who told me my car was covered under two extended warranties for a well documented engine failure on this exact vehicle - Hyundai Santa Fe Sport 2017. I’ve been researching and Hyundai knows about this problem and it had been through the courts after group legal action was taken. Hyundai refuses to pay for the car they know is a failure to be diagnosed. I cannot afford to have the car diagnosed especially not for a problem that Hyundai and half the world know (and have documented) is Hyundai’s fault. Vehicle can not be driven.

Filed Oct 14, 2026 · Engine, Transmission · OK

This is in reference to the Hyundai 9C2 ECU software update for Theta II engines that have caused my 2017 Santa Fe Sport to hesitate, surge and run poorly the first few minutes after a cold start! I contacted my dealership but they have not offered any resolution as of yet even though Hyundai Corporate is well aware of the problems caused by the 9C2 software upgrade!

Filed Oct 12, 2026 · Electrical, Engine · FL

I was driving my car and it showed no signs of any issue but the engine light came on and started blinking so I pulled over and got it towed to a mechanic. He told me that I would need a new engine that would cost me $8000. I looked into it and found that there was a defect with my vehicles engine and that if I took it to a dealership, I could possibly get it covered 100% so I did that and then they covered it and when I got the vehicle back, it had an issue every time I drove it where it was kind of speeding up and jerking when I drove it, I took it back after I told them what happened and then they told me that my catalytic converter was bad and needed to be replaced. I ended up paying $1500 to get that replaced and when I got the car back again it’s still jerking and doing the same exact thing even worse. I contacted them. They told me to bring it back which I did and they told me that it needed a software update that was not available so that I would just have to be patient. They told me that anytime I wanted to drive it I had to let it warm up for 5 to 10 minutes and that it wouldn’t do that. I’ve had my vehicle back for over two weeks and it doesn’t matter if I warm it up or not it’s still doing the same thing. I do not feel safe driving this vehicle and I have not been giving any resolution by either the dealership or by the consumer affairs case manager that I have been working with on this. This has been an ongoing issue for three months now. It’s costed me hundreds of dollars in Ubers because I don’t feel it’s safe to drive.

Filed Oct 1, 2026 · Acceleration, Electrical · MN

harsh engagement or hesitation between gears 1 through 3 specifically during cold starts before the powertrain warms up. But also during driving in the highway.

Filed Sep 29, 2026 · Engine · IA

Service Campaigh 9C2 Following completion of Service Campaign 9C2 (Theta II Emissions Improvement), certain vehicles may exhibit a brief hesitation or rough shifting condition during cold start operation. My 2017 Hyundai Santa Fe sport has severe loss of power and rough jerky transmission after the update. This condition will definately cause unsafe driving and vehicle engine and transmission damage. Hyundai corporate and local dealerships indicate no remedy for this situation. Dealer also indicated that Hyundai corporate may not release a new software update to fix the issue. This is unacceptable.

Filed Sep 17, 2026 · Engine · FL

My 2017 Hyundai Santa Fe was brought to a local Hyundai dealership for routine maintenance on July 1, 2026. The 9C2 software update was installed, without my knowledge or consent, during this service. Immediately after getting my car back, I noticed a problem starting the car (though no warning lights or alerts populated). The car seems to stall and then jerk during the first few minutes of driving, particularly after a cold start (car has been sitting for a few hours before starting). This has been a KNOWN issue by Hyundai for several months, yet this update continues to be installed. There is currently no fix, and Hyundai simply suggests letting the car "warm up" for 3-5 minutes before ever driving it. I have reported this to Hyundai corporate and have no other resolutions or timeline on a fix. Many other individuals are affected. This is particularly dangerous due to drivers not always having the ability to wait 3-5 minutes to let their car warm up, and the car is quite difficult to control with all the initial jerking and stalling. I live in a residential neighborhood and continue to be nervous about lack of control over the car when leaving my home. I firmly believe Hyundai should be held responsible for fixing this issue urgently.

Filed Sep 17, 2026 · Acceleration, Engine · NC

Campaign /Service Update 9C2 / TSB-25-01-087H broke my Hyundai. The car hesitates idling and on acceleration. Hyundai have no solution to this failed software update or acknowledging other issues it may be causing.

Filed Sep 14, 2026 · Acceleration, Engine · LA

I took my SUV to get the 9C2 recall on 8/7/2026 performed and took it home. The next morning when I cranked it and left my driveway it acted as if the vehicle didn't recognize that I was pressing my accelerator. It sputtered and hesitated acceleration for about five minutes. It also acted as if it was not going to change from first to second gear. After about five min. of playing with the gas pedal it straightened out. Twice I was almost hit by other cars expecting me to pull away from a stop sign. I took it back the next day telling the service agent what was happening and he kept it overnight. I received a text saying the technician was unable to find a cold start problem and it was ready to pick up. I was so mad I could barely hold my temper. I took it home and for the next week every single day it acted like this when cold started in the morning. I took it back to Premiere Hyundai of Harvey and was treated rudely this time. They acted as if they never had a single other complaint and told me I might have to leave it for several days so they could cold start test it for several days. This was on a Wednesday morning 8/19. I was never updated or called and when I texted my service rep on Monday 8/24 I was told the tech was not able to duplicate the complaint and to come pick it up. I will not ever buy another Hyundai because of the way I was treated and lied to. PLEASE create a recall for this badly handled recall 9C2. My Sante Fe Sport ran beautifully before this recall messed up my SUV. Now I have found if I let it idle for five minutes in the morning and accelerate slowly until it changes gears, most mornings it will run well, but if I crank it and pull into the street on a cold start it does the sputtering HELP US HYUNDAI OWNERS

Filed Sep 11, 2026 · Engine, Transmission · NC

My 2017 Hyundai Santa Fe Sport exhibits a documented mechanical failure under active code P0420 (Catalytic Converter Efficiency Below Threshold). This failure is the direct proximate consequence of a severe, long term manufacturing defect in the Theta II engine block, which has caused excessive oil consumption. Following the official 1,000 - mile diagnostic driving protocol completed on XXX, Keffer Hyundai (a Hyundai dealer located in [XXX]) service department officially confirmed the active code P0420 catalytic converter failure. They issued a formal written recommendation to replace the entire engine assembly but generated an out-of-pocket consumer estimate of $10,035. This case falls under the the terms of the Theta II Class Action Settlement which requires Hyundai to cover the defective engine block under the Lifetime Warranty Extension, along with any subsequent component damage (the Catalytic Converter) destroyed as a direct result of the engine's oil burning defect under the Lifetime Warranty Extension. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Sep 1, 2026 · Acceleration, Engine · MA

Brought my 2017 Hyundai Santa Fe Sport into the dealer on July 25, 2026 for the ECU and Theta II software update (Hyundai Service Campaign 9C2). Before the recall service my car drove perfectly with no issues. After the recall service my car is extremely jerky when shifting at low speeds and has long delays when trying to accelerate. This problem is particularly apparent on cold start, and less so once the vehicle has been driving. The issue is not as noticeable if the vehicle has been driven, is turned off, and then turned on again before fully cooled down. The jerky shifting has been getting worse over the past month. Vehicle was taken back to the dealer that conducted the software update on August 26, 2026 and they charged me for throttle body cleaning and EFI service which they performed for carbon build up as they cited this as the cause for the issues. The issue was not resolved from this service despite the dealers claims and the vehicle still has the same jerky shifting and delayed acceleration on cold start. There are no warning messages. Issue is becoming more widely documented among users after this particular service campaign so it is not an individual isolated problem.