What 162 owners told NHTSA about the 2021 Hyundai Santa Fe Plug-in Hybrid

Car misfiring symptoms like rough or shaky idle, hesitation and loss of power during acceleration, stumbling, unusual popping/backfiring noises, poor fuel economy, and a lit Check Engine Light. Felt vibrations / heard sputtering sounds, as if the engine skipped a beat, often becoming more noticeable under load or when accelerating. Sometimes, the issue goes away after restarting the engine.

NHTSA ODI 11709148

On 1/1/26 while traveling on the highway with no traffic in front of or right of my vehicle the ADAS emergency brakes applied themselves and slowed the vehicle nearly causing my vehicle to be rear ended. Vehicle is available for inspection. Faulty assistance nearly caused a rear end collision along the highway. Not aware of ADAS being tested inspected although multi-point inspection was done 10/2025. No warnings prior to incident.

NHTSA ODI 11708328

My transmission failed, even after the #236 recall in 2022. My car was recalled for Recall #236 in 2022. My car was updated and "fixed" and now in 2025 is showing the p1c2d03 code and requiring a new transmission. The same recall, without the fix.The car is in great health and never had issues until I was going 60 miles per hour on a busy highway and it reduced to 26 miles per hour during busy traffic. Causing me to almost get rear-ended multiple times and people swerving off the highway to miss me. My car was not going, even with the gas pedal down. I had no warnings, it happened out of nowhere.

NHTSA ODI 11696391

While traveling Interstate 75in Florida en route to Venice Hyundai for routine oil change at 65 mph, vehicle rapidly slowed to 40mph, driver pressing on gas pedal but vehicle would not accelerate( while being tailgated by semi that was flashing warning headlights at me). There was burning smell while this was happening. Pulled onto shoulder and called Hyundai service for assistance tow truck brought me in. Vehicle inspected by Hyundai Venice technicians ran through computer tests all ok, tech drove vehicle not able to reproduce problem. Oil changed tired rotated. Instructions included not able to do any repair because cannot find anything wrong with vehicle please contact us if problem recurs. I have had several conversations with service advisor voicing serious safety concerns regarding driving this vehicle and informing him that what occurred was my car went into failsafe/limp home mode which is what happens when there is serious problems with vehicle and should not be driven till repaired. And cannot repair until computer finds a code signifying problem.

NHTSA ODI 11695077

The transmission in my 2021 Hyundai Santa Fe has failed multiple times. The first failure occurred within the first two years of owning the vehicle. The car began jerking, hesitating, and struggling to accelerate, and the check engine light came on. The dealership confirmed a transmission issue and replaced the transmission under warranty. After that replacement, the same symptoms returned, and the transmission had to be replaced a second time, again under warranty. The most recent transmission replacement was only a few weeks ago, and the same symptoms are already returning — the vehicle hesitates, jerks, and occasionally loses power when trying to accelerate. These problems create serious safety concerns, especially when merging onto highways or crossing intersections. The hesitation and loss of power make it unpredictable and unsafe to drive. I have two young children who ride in car seats, and I no longer feel confident that this vehicle is safe for my family. Hyundai service employees have acknowledged that this is a known, recurring issue with this model’s transmission design. However, no permanent fix or recall has been issued, and I have been told to continue replacing the transmission under warranty until the coverage runs out. This approach does not address the underlying safety defect. The issue has been confirmed by Hyundai dealerships multiple times. The check engine light has come on before each failure. I am reporting this because repeated transmission failures that cause hesitation and power loss are a clear safety risk, and Hyundai has not provided a lasting solution.

NHTSA ODI 11694090

The contact owns a 2021 Hyundai Santa Fe. The contact stated that while driving at an undisclosed speed, the controls on the steering wheel became inoperable. In addition, the air bag warning light was illuminated. The vehicle was taken to an independent mechanic where it was diagnosed with clock spring failure. The contact was informed that the clock spring needed to be replaced. The vehicle was not repaired. In addition, the contact stated that the Department of Motor Vehicles declined the registration renewal due to the failure. The manufacturer was made aware of the failure, and several cases were filed. In addition, the contact was informed that the repair was not covered under the recall nor special program. The failure mileage was approximately 60,000.

NHTSA ODI 11691820

The horn on my 2021 Hyundai Santa Fe has completely stopped working. This is a severe safety hazard. I recently attempted to warn another driver who was drifting into my lane but was unable to, forcing me to swerve and nearly resulting in a head-on collision. The horn failed without any warning. After researching online, I have found that this appears to be a known issue with the Santa Fe model and Hyundai vehicles in general. I am requesting a diagnostic and repair as this is a safety feature failure that could lead to a serious accident. Please let me know if this issue qualifies for a recall. Thank You

NHTSA ODI 11688330

The contact owns a 2021 Hyundai Santa Fe. The contact stated that while the vehicle was parked and occupied, a bystander noticed that the glass partition had shattered without impact. The dealer was contacted. The vehicle was taken to the dealer, and the contact was informed that the part replacement was not covered under warranty. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 46,677.

NHTSA ODI 11680406

For a few month now the light of ABS have been turning on. At the beginning there was no diagnosis specific, cause kept turning off. Two or three months ago again turn on and gave code of back caliper on the left and was changed. An now yesterday August 5, 2025 the diagnosis its need of change of the SBS module whole.

NHTSA ODI 11678694

The car horn stopped working very suddenly, without any prior warning, while I was driving. The car has around 36000 miles on it, so the horn dying out was a surprise. Driving without a functioning horn has also become a safety issue. I have an upcoming appointment with the dealership to diagnose and fix the problem.

NHTSA ODI 11672538

I am writing to formally report an issue with my vehicle that I believe may warrant a recall investigation. The issue involves the fuel door, which is failing to open after the car has been turned off. This has occurred repeatedly and is preventing me from refueling the vehicle, posing a significant inconvenience and potential safety concern. Despite ensuring that the vehicle is unlocked and powered down as instructed, the fuel door remains stuck and will not release. This malfunction requires manual intervention or technical assistance each time I need to access the fuel tank, which is not only frustrating but could also become hazardous in certain situations. I would appreciate it if this matter could be reviewed for possible recall consideration or guidance on next steps. Please let me know if additional documentation, including my VIN or service history, is needed.

NHTSA ODI 11668144

The contact filed the complaint on behalf of the contact's mother. The contact owned a 2021 Hyundai Santa Fe. The contact stated that while the contact's mother was driving at an undisclosed speed, the vehicle was crashed into by an oncoming vehicle. The other vehicle crashed into the front passenger's side close to the front bumper area. The driver's side door independently opened, although it was secured and locked prior to the crash. The contact stated the vehicle spun around and flipped onto the driver's side. In addition, the contact's mother's left leg and left foot were pinned underneath the vehicle. The vehicle was towed to a local tow yard. The vehicle was condemned as a total loss by the insurance company. The paramedics and Police arrived on the scene. A Police report was filed. The contact's mother was transported to the local medical center. The contact's mother sustained compartment syndrome, the big toe bone was broken in two places, and the left foot was broken. The manufacturer was made aware of the failure. The failure mileage was unknown.

NHTSA ODI 11663064

I am writing to formally express my deep concern and dissatisfaction with the ongoing quality and safety issues I have experienced with my 2021 Hyundai Santa Fe, which I purchased new in March 2021. Despite regular maintenance and careful ownership, this vehicle has presented a persistent pattern of failure—most notably involving the electrical systems, onboard cameras, and overall build quality. Specifically, the following issues have occurred: •The rear backup camera has intermittently failed for an extended period, frequently displaying a black screen or static lines, rendering it unusable. •The front camera system has now failed entirely, disabling several advanced safety features. A warning alert is permanently displayed on the dashboard and cannot be dismissed. •I was recently informed that repairing this front camera will cost approximately $2,400, a significant expense for a system that should not fail this early in the vehicle's life cycle. •The overall quality of the interior materials has proven to be poor, with excessive wear and inconsistent performance of various controls and features. •In general, the engine power and performance fall well below expectations, especially given Hyundai's advertised standards. These recurring issues have not only affected our driving experience but have also introduced serious safety concerns, particularly as critical systems such as cameras and driver-assist features are now non-functional. We have never experienced this extent of problems with any vehicle in our ownership history. At this point, we are extremely disappointed and frustrated, and we feel that Hyundai has failed to uphold the level of quality and reliability expected from a modern, family-oriented SUV.

NHTSA ODI 11663198

Horn failure, confirmed by Hyundai dealership. No warning or indication of failure. Went to use horn in a safety situation when I needed it, and it was non-functional. A huge safety risk for myself and other drivers on the road. In doing research, this is a known manufacturer defect, with most owners having to replace low and high horns multiple times due to failure. The horn units apparently due to placement and design fill up with water, which leads to failure, again, without warning.

NHTSA ODI 11662919

Ever since I have purchased these tires I have been experiencing extreme violent vibration between 60 to 75 Mi an hour on the highway at first I wondered if something was wrong with the balance on the tire so I had them checked at the dealership twice and then I went to another dealership because the problem continue and had them checked same results no issues the balance machine only goes to 55 mph then I took it to a private garage paid out of pocket for the diagnostic twice because the problem over time persisted I also had an alignment done out of pocket and the problem again persisted I did a little research yesterday and there's many threads and forms in which people have complained about the exact same problem with the exact same tires I have screenshots I have video of my car doing it this is a manufacturer's defect that I'm trying to get addressed before somebody gets killed I have spoken to Pirelli corporate itself about this they're going to be issuing me a warranty claim let's see how far I get with that but the problem still is out there for others

NHTSA ODI 11662812

This vehicle has two instances of transmission disengagement. One at highway speed and the other while driving in a residential area. In both cases the vehicle suddenly started to slow down, and the rpms went up to 4-5 thousand. I was able to stop the car and turn it off and after a few minutes restarted the car and completed the journeys without any further issues. I have contacted the dealer and will be taking the car in for a diagnosis. I did not notice any warning lamps or other symptoms before each occurance.

NHTSA ODI 11660982

The horn has failed and been replaced 2 times after purchasing from brand-new. It has failed again but the vehicle is now out of warranty.

NHTSA ODI 11660786

Horn stopped working on my 2021 Santa Fe. Reported to dealer and they confirmed that both horns (high and low?) were broken. There was no indication that the horn was malfunctioning. It worked and then it didn't.

NHTSA ODI 11655003

The contact owns a 2021 Hyundai Santa Fe. The contact stated that the horn had become inoperable. There was no warning light illuminated. The dealer was notified of the failure and informed the contact that the failure was a common failure. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 55,000.

NHTSA ODI 11646266

Upon starting the vehicle and placing in drive, it drove like it was stuck in a low gear. A few seconds later the vehicle stopped moving while in drive and would not respond to drive or reverse despite turning off the ignition and restarting. I was stranded in an intersection and the car would not move. It had to be towed to the dealer.

NHTSA ODI 11645700

12v connector for phone charger melted my phone cord. Reported to Centennial Hyundai Las Vegas and High Desert Hyundai Kingman Az. Both service departments said my vehicle cannot detect the problem because I purchased a substandard plug-in. I have worked as an operator of high voltage electrical systems. I understand in some circumstances that a system cannot detect a fault, however the company is still responsible for the fire it caused. This is unsafe and can cause serious consequences. It must be corrected.

NHTSA ODI 11643612

The seat belt is incredibly slow to retract. Most times I need to help it along. I've tried pulling it out to check for kinks (none there) and tried cleaning it but it still won't retract

NHTSA ODI 11641254

I bought this vehicle brand new in 2021. It failed its first safety inspection in 2022. I was asked ..did you know your horn is not working? Took it to the dealer and was told this has been a common issue, the relays are freezing and popping in the cold. Have lots in stock because of this issue. The service dept has stated on each replacement parts are in stock because this happens all the time. It has now become an annual replacement for me. I just had my third set of horns in 3 years installed on 1/21/25. So for one this is a vehicle safety requirement to pass inspections in NYS. Two: I dont know my horn isnt working until I go to use it because I need to in a dangerous situation and its dead. There is no fix other than replacing the horns which is a huge inconvenience since closest dealer is 30+ miles away and can be weeks before they can get it in. There also has been no recall on this. My repair invoices are available in required.

NHTSA ODI 11637595

I hadn't been begging Hyundai to help remove a public safety risk for years ! Today, The service lady witnessed my car have a severe safety defect. Although initially offering a rental car, ultimately denied due to my inability to provide insurance until the 1st. My insurance is valid until tomorrow. N they REFUSED to provide the rental without the insurance being dated for 4 days from today. The man in the service office asked if I needed a ride home!? Suggesting i drive the car home. Hyundai has witnessed this cars emergency parking failing, and are aware that this car has rolled out of gear TWO TIMES, W my son in it !!?? Until today, claiming unable to "duplicate" the defect. And unable to "substantiate " my claims due to not being able to duplicate the deflect. They duplicated the defect today. The car no longer has a safety system, that safely parks the car, when the door is open. The safety system fails, at more then half of the attempts,engage and the car will roll in either direction with the car door wide open The service department duplicated the defect today. They claim to have documented the defect . i would like to believe they will finally do what is right.. The realistic fact that they have chosen to disregard the safety of the community, and refuse to offer the rental car, is extremely dangerous to the community and neglectful to the laws of the Safety Act and my Consumer rights. With now, TWO (NOT AT FAULT) Rollaway accidents , insurers are refusing n to provide coverage for the vehicle. Some only offer liabilit, or want 4 xs the quoted rate. Hyundai is aware that this car is defective.. Hyundai has a recent consent order, for over 54 millionth dollars, for untimely recalls and falsafying reports to the NHSTA . They are now, as they then, are in violation of the Safety Act and the NHSTA Consent Order with Kia in the Theta II engines Class Action The purpose of the Safety Act, is to prevent serious injuries, from known defects before

NHTSA ODI 11633275

Rearview Camera does not work (Signal Loss message appears). I nearly hit 1 adult and 2 small children that were passing behind my vehicle in a parking lot. I felt the need to report this even though a recall is being put into place. I have an appointment already to have the camera repaired.

NHTSA ODI 11632063