2025 Hyundai Santa Fe

My 2025 Hyundai Santa Fe Hybrid has recurring powertrain communication failures starting at only 67 miles and continuing at 5,300 and 6,200 miles. Diagnostic trouble codes include U010100 (lost communication with engine control module) and multiple U100xxx codes related to transmission and CAN bus communication failures. These indicate loss of communication between critical control modules. The issue has happened multiple times and remains unresolved. I am concerned this could cause drivability problems, warning lights, or sudden loss of power. This appears to be a system-level defect in the vehicle’s communication network.

Within a month of purchasing the vehicle [March of 2025] I was having a windshield replaced due to a crack. After I had that one installed, it needed to be replaced due to scratches on the windshield [safelite warrantied it under faulty glass]. Now within 2 weeks I have had 2 small impacts and 2 chip/cracks filled. I have never had issues with windshields in my driving career thus far like this. I understand windshields can pick up rocks and what not but searching online it doesn't seem to be an isolated incident at all. I think Hyundai may be using cheap glass or something. This is very frustrating because im constantly looking anytime I hear an impact on the windshield. Also, I do not want to be constantly calling safelite for chip repairs

While driving on a service road at approximately 45 mph, the corner side glass on my 2025 Hyundai Santa Fe shattered suddenly and without warning. There was no impact from a rock or object, and no other vehicles were present that could have caused debris. We had just entered the service road, and road conditions were normal. My [XXX] was seated in the front passenger seat at the time of the incident. The glass shattered inward, and the only thing preventing glass from entering the cabin was the window tint holding the shattered pieces together. This presented a serious safety hazard, as occupants could have been injured if the tint had not contained the glass. Once parked in my garage, I took pictures and tried to examine the damage but the window was still crackling and popping. My husband was able to inspected the window immediately after he returned home and confirmed there is no visible rock chip or point of external impact. The fracture pattern appears to originate from inside the glass or along the edge, consistent with a stress fracture or defect rather than road damage. This failure occurred under normal driving conditions with no accident, no debris strike, and no extreme temperature change. The sudden shattering while driving posed a significant risk to driver control and passenger safety, especially with multiple children in the vehicle. I am also aware of other owner complaints involving unexplained glass cracking or shattering on Hyundai Santa Fe vehicles, which raises concern that this may represent a broader defect rather than an isolated incident. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

I am submitting this complaint to formally report ongoing and unresolved vehicle safety defects involving a leased 2025 Hyundai Santa Fe. These defects include persistent toxic or chemical odors inside the passenger cabin, electrical and body control system malfunctions, and unintended vehicle operations that present serious risks to occupant health, vehicle security, and public safety. Despite multiple service visits and repeated requests, Hyundai dealerships have refused or failed to conduct comprehensive diagnostic testing, leaving the vehicle in an unsafe and unreliable condition.

I am reporting a safety hazard with the Driver Monitoring/Driver Assistance system in my 2025 Hyundai Santa Fe SEL (VIN: [XXX] ). The system frequently misinterprets my normal driving behavior as inattentiveness and triggers constant, loud beeping while I am driving. In many cases, it also disables assistance functions mid‑drive, which is dangerous and unexpected. The false alerts appear to be caused by the system misreading my eyes due to their natural shape and size. This issue does not occur with my wife, who has larger eyes, which indicates the system is biased toward certain physiologies and does not reliably detect all drivers. I have tested this repeatedly: if I strain my eyes unnaturally wide, the alerts stop, but this is extremely uncomfortable and only sustainable for a few seconds. The system is effectively pressuring the driver to adopt unsafe, unnatural behavior to avoid constant alarms. Environmental conditions such as sun glare, rain, and darkness make the false alerts even more frequent. The sudden loud beeping is startling and forces me to divert attention from the road. The unexpected loss of assistance features during driving further increases the risk of an accident. This system is not functioning as an assistive feature. Instead, it creates distraction, encourages unsafe compensatory behavior, and fails to accommodate normal variations in driver physiology. I request that NHTSA investigate whether Hyundai’s driver monitoring system meets safety and reliability standards and require corrective action if necessary. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

After a maintenance service was performed at 16500 miles, we began to notice a high pitched whistling sound when pressing gas pedal doing highway driving above 75mph. The car was brought back to the dealer who couldn’t duplicate the complaint. We drove cross country, sound consistent until it began to make the sound at lower and lower speeds. We arrived at our destination and I took the car to the dealer we bought the car from. Their tech claimed it was normal coil whine. Since it was progressing I had the manager test drive the vehicle who agreed it was not normal. After a week we switched service advisors who immediately determined it was a failing transmission that needed replacement Now waiting for parts to arrive. I am requesting a buyback per California lemon law

I have had my 2025 Santa Fe since May 28, 2025. Shortly after, I was driving to the supermarket and once I found a spot, I put the car into Park. Unfortunately, I did not start recording the episodes and taking pictures until July 29, 2025. I had had my car into Hyundai of 110 two weeks prior. One of the in-take people saw the episode happen once I put the car into P. I asked him if this was normal and he told me no. He then got several of the managers and they immediately came over because this was occurring: My dashboard was literally screaming at me, the MPH and RPM were flashing and the battery warning light along with the warning light that shows the car with the hood open were flashing. The following message was displayed: Auto Stop is OFF. Shift to P or N and start engine manually. I asked this person several times if it was ok to shut off. Every time, he said yes. I asked if he wanted to take a pic or record it and he told me not to worry. He'd remember. So I shut the car off. Well, he never once spoke up while they were trying to find out what the silly female was speaking about. Since then, this has happened MULTIPLE times. I recently dropped my car off at Hyundai of 110 and they concluded that because they were unable to "replicate the problem", there was nothing wrong. I had sent them every single video or picture. Despite concluding that there was nothing wrong with my car, they will not put that in writing. Nor will they put in writing that they will accept fault for when my car stops working in the middle of nowhere and God forbid, something happens with myself and/or my passengers. My car is currently sitting at Hyundai of 110. They refuse to allow a manufacturer's technician to look at my car. All of my videos exceed 10 MB

There have been several times that I have been driving and either turning onto a 4-lane road (2 lanes going each way) or driving on the parkway, where my car has slammed on the brakes by itself. Not only was I not prepared for this to happen, but neither were the cars behind me. I tend to drive with at least 1.5 car-length space between myself and the car in front of me. Last week, I was making a right hand turn (going north) into the right lane from a residential street. The only other car near me was the one driving in the left lane (also going north). My car drove about 100 ft and maybe realized that there was a car next to me and just slammed on the brakes. I was suddenly thrown forward. My seat belt locked and I was thrown back into my seat. I had a bruise from my seat belt and came too close to slamming my head on my steering wheel. Thankfully, the car behind wasn't tailgating. About a month ago, I was driving on the parkway going east. I was originally in the right lane. I put on my blinker and when it was clear, I changed lanes to the middle lane. After I was clear and my blinker was off, my car started screaming to tell me that there was a car in my driver's blind spot (this happens EVERY time I switch lanes). I drove for maybe 1.5 - 2 miles and then suddenly, my car slammed on the brakes. Someone must be watching over me because the Escalade behind me (definitely tailgating) was somehow able to swerve into the left lane and then swerve around me to cut me off in revenge. They were screaming and honking at me, while I was screaming and yelling at my car. They could have easily have plowed into me (we were driving at least 60mph) and could have caused a horrible accident that could have killed myself or others around me. I have notified Hyundai of this issue and have read many similar complaints online. Hyundai claims they cannot "replicate the situation" and therefore, Hyundai Corp is unable to fix the problem.