Cruise Control problems of the 2017 Hyundai Santa Fe

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!!.

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.

Excessive engine braking on downhill roll with cruise engaged, will downshift then downshift again. While reducing the speed the cruise will cause the transmission to up-shift still rolling down the same hill at this point the cruise realizes the speed increase and does a double downshift from where it was. At this point the rpm has jumped to just under 5000 with the engine whining like its in pain. I live in and travel, to and from work in the lower savannah river area of south carolina. The hill that I was on is about the length football field and the speed limit is 55mph unsure of the grade, but as I explained where we live. The first time I noticed this issue the odometer had just over a thousand miles and just thought it was an anomaly but now it has just under three thousand miles and it still has the problem. The car was purchased as a wedding gift for my wife and she's scared to drive it because of the cruise control issues. She would rather drive her 2007 Santa Fe the cruise control in it acts normal and feels dependable, even with 114,000 miles on it. I've contacted Hyundai motors and have taken it to the dealer with no results. Hyundai assigned me case worker angela godbey (714) 965-7049 she closed the case 8/23/17, but not without giving indication that the problem is a manufacturers installed defect.

I purchased a new 2017 Santa Fe sport on 5-26-17. On 7-19-17 at around 7100 miles I received a message warning me of the engine overheating. I put a phone call in the following morning to my dealership and was told to bring it into the shop 7-20-17 (thur). That afternoon I received a call from my service adviser stating there was no check engine light on and they could not find an issue. I then restated it was not an engine light but an actual message stating the engine was overheatng. He then called me back 10 minutes later stating there in fact was a leak in the water pump and they needed to replace the gasket and that they would not have the part until 7-25-17 (tues). When I finally got my car back on the 26th (wed) all seemed fine again. On Friday 7-28-17 while driving on cruise control at 60 miles per hour I felt the car down shift and rpm's started going well over 5000 and the only way to stop it was to push on the break this happened twice withen an hour span. I contacted dealer again and was told to bring car back. Note they also had to fix a scratch put on my passenger mirror from when car was serviced the first time. I brought my Santa Fe back in on Monday 7-31-17 and finally decided to contact service department on wed 8-2-17 when no body called to let me know of issues. Since then todays date is 8-10-17 I contacted dealer again to find out status as of right now they had to replace head gasket , reprogram cruise control and replace thermostat on top of the gasket they already replaced on water pump. The service department also stated they still smell coolant in my SUV which concerns me still since I am 5 months pregnant. I did start case with Hyundai USA and am waiting to here what options I may have but know I do not want this SUV back for my safety.

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.

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.