Hyundai Santa Cruz adaptive cruise problems

Filed Jul 19, 2026 · Brakes, Driver assistance · TX

I’m concerned about the power brakes I’ve received these faults a few times. DTC DTC System DTC Sub System C184987 CHASSIS LKAS Also there are reports online that other owners have experienced this issue with their Santa Cruz’s Some reporting dealers lack of concern. Diagnostics History My vehicle Last Reported Original Date Mileage Status DTC DTC System DTC Sub System 02/23/26 02/20/26 572 C184987 CHASSIS LKAS This refers to the vacuum pump that controls the power brakes. When applied the brake pedal becomes firm. When this code is triggered, your vehicle will likely illuminate warning lights on your dashboard, such as the ABS and ESC warning lights. You might experience a change in how the brake pedal feels or a temporary deactivation of cruise control or stability features. The Diagnostic Trouble Code (DTC) C184987 is a chassis-specific trouble code that typically points to a fault in the vehicle's braking or stability control system.

Filed Apr 25, 2026 · Acceleration, Fuel system · DE

While driving on I-81 up a steep grade, truck suffered a sudden power loss, with speed dropping to 35 MPH from 65 MPH. Attempts to regain speed failed and it felt like truck downshifted to a lower gear. 35 MPH continued until I decided to use truck cruise control to attempt to gain speed. I was worried about tractor trailers hitting me due to low speed. Finally got vehicle to 65 MPH but would not go above 65 MPH. Rode that way for 100 miles ( trip home was ~ 200 miles) finally in lighter traffic when I had to brake, I tried to use gas pedal to maintain speed.and it worked. Rode the last 100 miles normally. I was at great risk when truck went from 65 MPH to 35 MPH. This is the second incident vehicle suffered in the last 2 months.. Dealer was not able to diagnoise problem. Vehicle had no warning lamps to warn me in both instances.

Filed Nov 7, 2025 · Acceleration, Driver assistance · MA

All safety feature warning alerts (3) of them, since it will not allow me to check all that apply they are the following adaptive cruise control not working, blind spot warning not working, forward collison detection not working, lane departure warning not working, lane keeping assistance not working, parking collision warning not working rear cross traffic warning not working.

Filed Aug 15, 2025 · Driver assistance · TN

Make: Hyundai • Model: Santa Cruz • Year: 2025 • Trim: Limited • Mileage: 2600 miles • Date of Purchase: July 2025 Description of the Problem: I am reporting a safety issue with the Forward Attention Warning (FAW) system on my 2025 Hyundai Santa Cruz Limited, which unexpectedly disables Smart Cruise Control (SCC) during highway driving. The FAW system, which uses an in-cabin camera to monitor driver attentiveness, frequently misinterprets normal driving behavior—such as wearing polarized sunglasses or holding the steering wheel at the 12 o’clock position—as inattention. This causes SCC to deactivate abruptly, resulting in sudden speed changes that create a safety hazard, particularly at highway speeds (e.g., 65–70 mph). The issue occurs multiple times per drive, especially when wearing sunglasses, and persists even after attempting to disable FAW in the vehicle’s settings (Settings > Vehicle > Driver Assistance > Driver Attention Warning > Off). For example, while driving on [XXX], SCC deactivated without warning due to FAW detecting my sunglasses, causing the vehicle to slow unexpectedly and requiring immediate manual intervention to maintain speed. This has happened regularly, creating a risk of rear-end collisions or driver distraction. I contacted my Hyundai dealership and they stated that no software fix is available and the system is “working as designed.” Hyundai’s Technical Service Bulletin (TSB 25-GI-001H) acknowledges FAW issues with sunglasses and hand position but offers no solution. I also contacted Hyundai Customer Service (1‑800‑633‑5151), but they provided no resolution. This issue is widely reported by other 2025 Hyundai owners (e.g., Tucson, Santa Fe) in online forums INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Dec 26, 2024 · Driver assistance · OH

The Hyundai Santa Cruz has a Driver Forward Attention Warning system. The steering column has a camera that monitors the driver's eyes and face to make sure the driver is watching the road while the cruise control is engaged. The feature shuts down the cruise control if it assesses the driver is not paying attention to the road. The feature does not account for the driver wearing sunglasses, however. It still shuts down the cruise system even if the driver is paying attention while wearing sunglasses. The feature can be disabled on the instrument panel, but it is never actually disabled; it still keeps shutting off the cruise control whether the function is enabled or disabled and is a safety hazard since the driver can't wear sunglasses and use cruise control simultaneously.

Filed Nov 14, 2024 · Driver assistance, Electrical · GA

While driving at highway speeds with Smart Cruise Control set during the day I put on sunglasses and the driver attention system turned off the system 6 seconds later. I repeated this event set several times at various speeds and driving conditions with the same 6 second failure result. I made the dealership aware of this and verified it with them in the vehicle. Apparently, system uses an IR camera to determine driver attention level via eye contact and does not work with most sunglasses. This seems to be a safety issue the dealership (or the manufacturer) should be the making the general public aware of.

Filed Oct 15, 2024 · Engine, Transmission · OH

On 3 separate occasions this has occurred . When accelerating, the engine or power train completely loses all propulsion. Twice I was starting a left hand turn and crossing oncoming traffic. On one occasion I was turning right onto a 50 MPH highway and quickly veered off the road onto the berm. The only item on dash board flashing on the third incident was the cruise control preset and it was flashing 20. At the time I was not using the cruise control and I did not set it for 20. No dash board warning lights lit during the first two losses of power. I reported it to the dealer. Today I had a maintenance appointment and inspection at the dealer. After that inspection, they informed me that they found no codes to identify the issue. I should let them know if it continues. My 3 failures happened at approximately 10,000, 15,000 and 20,000 miles. My safety and that of my passenger were most definitely affected each and every time. After 30 seconds to one minute the full functionality returns as if it never happened.

Filed Sep 26, 2024 · Engine, Fuel system · 13,803 miles · MO

The contact owns a 2023 Hyundai Santa Cruz. The contact stated while driving approximately 65 MPH with the cruise control engaged, the vehicle started losing motive power. The contact stated that the check engine warning light was illuminated. The contact stated that the vehicle slowed to approximately 15 MPH while depressing the accelerator pedal and failed to respond as needed. The contact was able to drive the vehicle to the residence. The contact turned off the vehicle and attempted to restart the vehicle; however, the vehicle failed to restart. The contact had the vehicle towed to a dealer who diagnosed the vehicle and determined that a fuel injector had failed and needed to be replaced. The vehicle was repaired. The manufacturer was not informed of the failure. The failure mileage was 13,803.

Filed Jul 15, 2024 · Brakes, Driver assistance · 1,000 miles · FL

The contact owns a 2023 Hyundai Santa Cruz. The contact stated that while driving 60 MPH with the cruise control feature activated, the braking system erroneously activated causing the vehicle to abruptly decelerate. After parking and restarting the vehicle, the vehicle operated normally, and the failure was corrected. The vehicle was later taken to the local dealer who was unable to determine the cause of the failure. There was no repair performed. The contact stated that the failure had reoccurred. The manufacturer was not yet contacted. The failure mileage was 1,000.

Filed Feb 22, 2023 · Transmission · MS

On February 10, 2023, I was driving my 2023 Hyundai Santa Cruz on Interstate 10 near Gautier, Mississippi. My cruise control was activated and I was cruising at a speed of about 76mph. Suddenly the vehicle began to rev up to 7,000 RPMs and decelerate. The vehicle then began to coast at around 45mph and pressing the accelerator did not increase the speed but did cause the vehicle to rev. I was able to coast down the off-ramp and turn into a parking lot, however I was nearly hit by oncoming traffic because the vehicle was losing power and I was unable to accelerate. Hyundai Roadside Assistance towed me to the nearest dealership with service center, Jason Pilger Hyundai. By the time the tow truck arrived, the vehicle would not accelerate at all and the driver had to push the vehicle around to the tow truck. After assessing the vehicle, the Hyundai dealership called Hyundai Tech Line and told me that my 2023 Santa Cruz needed a new transmission. The transmission is also on backorder, so I have no idea when my vehicle will be repaired. Hyundai Customer Care is also refusing to reimburse me the cost of my car payment for a brand new vehicle that I will be unable to drive or access for the foreseeable future. My Santa Cruz only had 5,337 on the odometer when this occurred.