Adaptive Cruise Control problems of the 2023 Hyundai Santa Fe

The vehicle's software was updated on oct 21, 2025. The software has serious flaw. When driving on slight incline on the passing lane the vehicle will apply the brakes without warning. This has happened 3 times. At times, when vehicles were following me they also had to apply the brakes unexpectedly. Had they not applied their brakes, they would have rear ended me at highway speeds. I also recall that there were no vehicles either in front or to the right ahead of me when it occurred. Also there was a guardrail on the left side of the highway at the time. This did not occur with the previous installed software. Every time this happened, the vehicle was in cruise control and driver assist was on to keep vehicle in the lane.

In January, 2024, my vehicle (2023 Hyundai Santa Fe) started shuddering when brakes were applied at high speed, on quick or hard stops, in stop and go traffic, and especially going downhill. I had only been driving the vehicle for about 5 months. I took the vehicle to an independent mechanic, who explained that my front rotors had burn spots. He recommended that I have them resurfaced. I did not want to pay for the problem to be fixed when I believed it was a factory defect and should be covered by warranty. I asked the mission hills Hyundai dealership service department to investigate and correct the problem, because I felt that my family's safety was jeopardized by faulty brakes. They showed me the burn spots on the front rotors and recommended resurfacing. They said I could wait for the pads to wear down and do the resurfacing at the same time as the pad replacement. Their estimate for resurfacing was higher than the one from my mechanic. I found a Hyundai technical service bulletin, number 23-br-004h, which described the exact defects of my vehicle. I returned to the dealership with the TSB in February, 2024. They replaced the two defective front rotors and front disc pads at no charge. The shuddering was no longer evident, and I thought the problem was resolved. However, 10 months later in December, 2024, I once again experienced the shuddering while braking on the freeway while going downhill and when slowing for stops from high speed. Since I had been told that the new rotors and pads were covered by warranty for 5 years or 60,000 miles, I returned to the dealership on 1/16/25 and asked them to evaluate the brakes again. They said that the front rotors again had burn spots. They once again recommended resurfacing at a cost of $249. I reminded them that there was a warranty on the new parts, they claimed that the only warranty was for the original parts that had been replaced. They agreed to resurface no charge. Please investigate and respond to my complaint.

Currently have 518 diagnostic history codes (dtc)in memory. Additionally, I have 3 active dtc’s. The codes are: dtc c160c87 dtc system chassis dtc sub system lkas, and dtc c160c87 dtc system chassis dtc sub system scc, and dtc c163881 dtc system chassis dtc sub system scc first occurrence: during actual assembly in montgomery, al plant. I have asked three Hyundai service dealers for help. All have tried. Noting noted that contributes to the issues above. At first, my dealer replaced the front camera. Was told it was a heating issue. I have contacted Hyundai bluelink service for help. An information report was filed, twice. The first report I received feedback that Hyundai’s engineers had corrected the issue. On the following day, the codes returned. A second concern was filed with Hyundai bluelink. Hyundai motor America case#: [xxx] to wit: “thank you for contacting Hyundai motor America. We are in receipt of your e-mail and one of our representatives will get back to you shortly. Sincerely, Hyundai motor America” is my vehicle going to fail and cause me injury while operating it on an interstate highway? this is quite concerning as I drive my car. All I want from Hyundai is to get this issue repaired. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

I've been driving in arizona on southbound 101 just south of w guadalupe rd and noticed an issue that is very odd. I have a 2023 Hyundai Santa Fe that has highway driving assist that does both speed control and distance from the vehicle ahead of me and lane keeping assist. After I pass guadalupe, but before an overpass for the sun cir trail, my vehicle, if those systems are on, goes haywire and all those safety systems turn off. I have experienced it on at least 3 of the lanes on that stretch. It happens both early in the am and later regardless of sun. It doesn't happen on northbound. As more cars have these features, this interference should be looked in to. I have not experienced this on any other of our highways. Here's a link to the the rough location. Https://maps. App. Goo. Gl/lravlg6mqqez8xuq6.

Occasionally the cruise control when accelerating will exceed the set speed and continue to climb and I will be going 20 miles faster than the set speed and climbing. The only way to sop this is to turn cruise off, slow down and restart. My thought is it happens after I have disengaged the cruise and then when safe reengage which is done by pressing the switch straight down. In my previous vehicles I would push the control up. I may be doing this by accident and giving the system an unknown command. Whatever I am doing to create tis situation is too easy to do and creates a safety issue. This has happened multiple times.

Over the last tom th, I have encountered some pretty scary issues with my brand new Santa Fe purchased in April. Last week, while driving, after I turned on adaptive cruise control, the system alerted me that “Smart crusade control conditions weren’t met” and kept trying to engage the front left brake — this occurred three days in a row. After turning off the Smart cruise control and entering residential roads, the front left brake tried to engage in a manner that seemed consistent with abs issue. I brought car in two days later to dublin Hyundai and they said they couldn’t find anything wrong with it. I picked the car up yesterday morning and then last night while driving on the highway, it alerted me that I need to “check highway drive assist system” and a warning light came up. After about 5 minutes, the car jerked me incredibly hard to the left on the freeway and then athe light turned off. Then two days ago, I was driving my car on the highway the car randomly said “emergency braking system activated” twice, while going 70 on the freeway in the middle of nowhere. This was while driving safely and no cars nearby either time. I looked online and it appears this is a problem that’s occurred in many Santa Fe’s, so there is clearly an issue with manufacturing (which I’m assuming is the same case as the previous issues I’ve run into).

Driving on highway with cruise control selected to 80 mph. Left signal is applied to travel to left lane to pass a semi trailer. When the vehicle is half way into the left lane, the automatic system applies hard braking even though the semi trailer has not been detected as too close. Vehicle slowed to 74 to 75 mph before cruise control was turned off. Vehicle behavior is a total surprise to vehicles following since the braking is unexpected on a clear road. Repeated the symptoms several times. This braking does not occur if the vehicle ahead in the right hand lane is an automobile. This only occurs if it is a large vehicle such as a semi. Moving quickly or slowly to the passing lane affects the total time the braking is applied. The slower the movement, the longer the braking is applied. Repeated this behavior at 75 mph and 70 mph with similar results.