general problems of the 2020 Hyundai Sonata - part 2

I first begin having an issue with the idle speed. It would jump up to 1,500 rpm, which is twice the normal 750 rpm level it started almost from the very beginning when I purchased this car new in early 2020. I mentioned it at first oil change at dealer at 3,500 miles. I was told it was normal. In the beginning it would come and go. Sometimes not happening for weeks in-between episodes. Then it started to have the check engine light come on after it would happen and stay on. I took it back while light was still on and they kept the car for several days. Said it was the epv valve and replaced it. Car operated fine for a few days then started up again. It also started to idle up and down from 1500 down to 500 in a rapid succession. I was able to get it to stop sometimes by turning engine off and them back on. Again I contacted dealership and took car back in. They gave me a loaner car and kept my car for over a month. This time they replaced the computer they told me. I did not have car for more than a week before it started doing it again. It has gradually gotten worse and happens more often now. It has also started to have the forward collision avoidance warning come on in addition to check engine light as well. Just this week it actually just died on me while driving and forced me to pull to side of road. Turn off the engine and restart the engine. This happen 3 times in succession. Dealership does not seem to have any idea on what is going on and have been not very helpful. 3 week wait to get an appointment to bring in and no loaner cars available. This problem with the 2020 vehicle is very dangerous. It can idle up at anytime and car will lurch, requiring forceful brakeing . Car dying while driving and losing power as well.

The contact owns a 2020 Hyundai Sonata. The contact stated while parking the vehicle and pressing the power button, the vehicle continued running. The contact was able to turn off the vehicle by repeatedly pressing the power button. The contact stated no warning light was illuminated. The vehicle was not taken to a local dealer. The manufacturer was not informed of the failure. The failure mileage was approximately 12,000.

I took my vehicle into the dealership when it was under 12,000 miles for another issue and mentioned a problem with the headlight on the right fogging up with moisture. I was immediately told that this had to be seen with their eyes because light cost more than $1,000. It has continued for over 1 1/2 years. Early this month, I took a picture at night and in the morning. The service manager wanted to add another hoop; can you get a picture of the water in it? the water is droplets on the light, decreasing visibility on the road. Pictures are attached. There is one picture that shows the left headlight with no issue.

Driving, car started making a weird sound followed by a warning light on dashboard with dinging sound to correlate. . . Car became difficult to gas, vehicle motion was lagging where I just knew I had to pull over bc this car was going to literally stop began to slowly (bc that’s all car would allow) to proceed forward and I was forced to come to a haunt as I pulled onto side of highway. I then could no longer move it. Turned car off for minute then returned to try to start again, car would not accelerate at all nor turn on fully. . I was forced to wait hour to get a tow. . . Took to shop, no problem such was found , car started & ran again . . . This is 3 days later the car again continued the same exact pattern & I was unable to drive any further and forced to once again to get tow. This has to be something of bearings with engine, this car mode is not on list but it certainly is an issue that I believe is related & should be rectified by Hyundai.

Following a firmware update to the obc for a recall, the vehicle transmission now has a severe delay responding to driver input. The transmission in this vehicle has electronic shift with pushbuttons. Previous to the firmware update, the transmission would respond instantly to driver input from these buttons. Following the firmware update, the transmission takes two seconds to respond. This delayed action prohibits driver emergency shifting, creating severe risk of an accident. In my vehicle, I recently was almost involved in a traffic accident when the delayed response from the transmission caused my vehicle to reverse into the opposing lane of traffic as acceleration was attempted thinking the vehicle had shifted into drive. Upon entering the active opposite lane of traffic, emergency accident avoidance was prohibited by the delayed response of the vehicle shifting into 'drive' in order to move the vehicle from the opposite lane of traffic. Previous to this instance, there have been delays in vehicle shifting which have nearly caused an accident when the driver attempts to place the vehicle in 'park', but the delay causes the vehicle to move forward as the driver removes their foot from the brake, and the car moves forward toward stationary objects and people. This has been reported to Hyundai and they have not responded yet. Furthermore, other obvious firmware issues in the vehicle have been identified, one in a different safety system.

I own a 2020 Hyundai Sonata. I purchased the car on January this year the miles in the car is 700 miles. A month after the car star giving me problem with break. Somehow the car applies the emergency break by itself and doesn't want to move. When I drive the car suddenly stop by itself and giving me message like: to move the car put your seat belt, lock all the door even when I have my seatbelt and doors are lock the car do that when ever the less I expected. I took the car three time for repair and update and the car give me the same problem. The dealer gave me a loaner another 2020 Sonata and have the same problem. This is a very dangerous issues because if is rainy or snowing. The dealer doesn't find anything wrong with the car when they drive the car. I told them that happen when the lees expected.

Pushed the park button, showed p on the dash indicator, doors then unlocked. When exited vehicle it began rolling backward, park had not engaged slight hill only. This has happened repeatedly. Pushed button to place the car into reverse and the vehicle would not engage or go anywhere.

The vehicle's fuel gauge (type c) does not accurately adjust for changes in the amount of gas in a timely manner. It normally takes 2-3 days for the gauge to move to full tank even though it is full. Same problem from 1/4 to 1/2 tank, etc. For example, I noticed the panel said I had 11 miles to empty on Friday. The gas gauge showed otherwise. I wasn't near my usual fill station, so I put 5 gallons of gas in the car. It is now Wednesday (5 days later). The gas gauge moved slightly yesterday to almost 1/4 tank, but the fuel tank warning went from 11 to 0 miles left to empty (see attachment). I drove on the highway each day and in the city. I purchased this car July 2020 with a full tank. This problem became evident in Aug 2020. After refilling the tank, the reader showed 111 miles to empty. I informed Hyundai agent of the issue, who had no idea why this was happening. The guage and fuel tank reader finally adjusted after about 3 days. I had 449 miles on the car at that time. I now have over 4,000 with same problem. Apparently, something is faulty, but I don't know what. Auto dealer is baffled. This issue could result in a real fuel shortage while traveling with no gas station nearby.

Tl- the contact owns a 2020 Hyundai Sonata. The contact stated that while driving at various speeds the vehicle blind spot passenger side would not turn on. The contact also stated the collision warning light would intermittently turn on while vehicle was on a red light. The contact stated the back brake assist would turn on intermittently , and happened on different occasion. The vehicle was taken to local dealer nassief Hyundai located at 1059 OH-46 north, jefferson, OH 44047 and preston Hyundai of sharon located at 1251 e state st, sharon, PA 16146 where they unable to duplicated failure. The vehicle had not been diagnosed or repaired as of yet. The manufacturer had not been informed of failure. The failure mileage was approximately 623.