2017 Hyundai Santa Fe: adaptive cruise control problems

Filed Jul 7, 2026 · Acceleration, Driver assistance · 130,000 miles · TX

The contact owns a 2017 Hyundai Santa Fe. The contact stated that while driving approximately 15 MPH on the interstate, the contact heard an abnormal tumbling sound coming from underneath the vehicle. The contact noticed an unknown object had detached from the vehicle. Upon inspection, the contact determined that the detached component was the radar sensor. The Automatic Emergency Braking (AEB) system and the adaptive cruise control became inoperative. The contact stated that the vehicle had not been involved in a crash prior to the failure. The vehicle was taken to an independent mechanic for inspection. The mechanic advised that the radar sensor could not be reattached and stated the failure was possibly caused by a crash. The local dealer was contacted, but the vehicle was neither diagnosed nor repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 130,000.

Filed Feb 11, 2025 · Engine · ME

In October I took my car to dealership for an oil consumption test and I was going through 10-15 quarts of oils between oil changes. In 322 miles I used 2 quarts of oil.Replace the engine is what I was told and manufacturer denied all goodwill. I ride around with a 5qt jug of oil and funnel in my car at all times. 10 days I was driving down the highway with my husband and child with the cruise control on, when I noticed that my tactometer was continuing to increase and the engine reving for no reason. I shut the cruise control off and the car speed slowed immediately, and when apply my foot to the gas I was not gaining any speed only slowing down. I pulled over into the break down lane and put the car in park. Once I put the car into park, it started to idle very loud and hard with the check engine, oil pressure and battery lights coming on and stalled, would not start. Had towed to personal mechanic he recommended taking it to the dealership as he was coming up with no pressure in the 4th cylinder and the 3rd at about 50%, checked with boarscope for faulty valves and saw nothing. Towed to dealership they say valve was consumed thru the engine it runs fine but not because engine needs to be replaced.

Filed Nov 29, 2022 · Acceleration · MN · fire

Vehicle spontaneously caught on fire in the engine compartment while driving in a parking lot. Within 30 minutes, the vehicle was incinerated down to the frame. Prior to this incident, a warning had flashed on the message center that the adaptive cruise control system was being disabled. It is pending insurance inspection and we are trying to contract Hyundai. The police report is not available yet, but is with the Faribault, MN, Police Department and is #[XXX]. INFORMATION Redacted PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6).

Filed Oct 2, 2020 · Acceleration, Fuel system · ID

During acceleration from a stop sign/red light or turning the engine hesitates for approximately 5 seconds after several tries before reaching desired speed. When using cruise control on freeways there is a 10 to 15 second delay when accelerating or passing another vehicle which in one instance caused a near accident on a high speed freeway. My vehicle slowed down causing other vehicles go around me passing from the right side lane. These hesitations have caused me several near accidents and makes me not feel confident when driving this car. I have taken the vehicle to the dealership on many occasions and they report no error codes show up and, the mechanic cannot duplicate the problem. However, the dealer replaced the transmission earlier this year. There has been no improvement. I have reviewed many other complaints of this hesitation problem. Will it take death reports to help us owners? My issue began in 2018 right after purchase and the problem is occurring more often now. No help is in sight when hyundai and the dealership refuses to admit the problem and makes me and other owners feel like we don't know our vehicles or our own minds!! We need help before a death occurs not after!!

Filed Jan 14, 2020 · Acceleration, Transmission · 30,700 miles · IL

When I drive going straight at about 40 to 48 MPH on eco mode or any drive mode the car jumps/ jerks like it shifts into a low gear and then goes back into a high gear with no heavy acceleration. If I have it on cruise control at 45mph it will kick back and forth occasionally as if I was slamming on the gas pedal then slightly on the break but quickly.

Filed Sep 5, 2017 · Acceleration, Brakes · 2,500 miles · NY

Smart cruise control fails to brake intermittently. It is designed to match speed with the car in front of it. It usually works fine, unless another vehicle cuts in front, even if there is enough time to brake. I have to slam on the brakes manually to avoid an accident. This has happened on multiple occasions. I now fear using the cruise control at all, as it does not perform correctly 100% of the time. The dealer said they could find nothing wrong, but this is a very real issue that puts my family at risk. They have now called in a master tech from hyundai to look at it, but I wanted to document this issue. I noticed it first within two weeks of purchase. Hyundai support closed my case several times without action. I bought it 5 months ago. Current mileage is 3462, so it is well within warranty.

Filed Sep 20, 2016 · Acceleration · 3,500 miles · KY

While driving our 2017 hyndai santa fe on interstate 64 with the cruise control set at 65 MPH the transmission will down shift to 5th and then 4th and then 3rd gear with the RPM almost red lining. This is while going down a slight downgrade. I've been having to use the manual mode to shift back up to 6th gear. We contacted the local hyundai dealer who stated they were aware of the problem but did not have a solution to the problem at this time. I am worried about the safety of this vehicle with this problem.