general problems of the 2021 Hyundai Elantra

The horn never worked since I bought it in August 2023, I’ve been in a countless near accident situations where I was rendered helpless. I’ve had several instances where I get locked out of my car because the vehicle would not read the key. I tried fix the issue because I assumed it was a dead car or key battery but the same problems kept happening shortly after. I became aware of the issue with the horn not working, when I recently purchased the vehicle. I tried to contact the alm dealership salesman to report the issue and they told me he had recently quit. They mentioned bringing it back to the shop but it wasn’t guaranteed that the issue would be fixed.

The reverse camera does not work.

I am writing to file a formal complaint regarding a significant safety issue with my vehicle’s backup camera system. The backup camera consistently malfunctions, displaying glitchy images with distorted lines across the screen. This issue renders the camera essentially unusable, as it fails to provide a clear view of the area behind the vehicle, posing a serious safety hazard. This malfunction directly impacts my ability to safely reverse, especially in crowded areas where visibility is crucial. The camera’s unreliability puts pedestrians and other drivers at risk, as I am unable to fully ensure that my path is clear when reversing. I strongly believe this defect poses a significant safety concern that needs to be addressed by the manufacturer. I request that the NHTSA investigate this issue and take appropriate action to ensure that this problem is resolved for myself and the many other affected vehicle owners. Thank you for your attention to this matter.

The hybrid charging system fails once the vehicle is above 75 mph. After about an hour or two, the vehicle will die on the highway. This is a reoccurring issue putting our safety at risk. The dealership cannot find what the problem is. Online forums show similar issues with dealerships unable to solve the problem.

Unintended acceleration is happening. After about 15-30 minutes of driving, accelerating from a stopped position becomes very difficult in the sense that the vehicle does not accelerate when gas pedal is pressed. This can be extremely dangerous as you do not know when the vehicle will no longer accelerate and could get hit when crossing an intersection or turning onto any road at all. Esc warning light came on today and vehicle will no longer start but goes into auxiliary mode. This is not the first time, second, third, nor even 5th time a report on this vehicle has been made and with each report more issues are arising with seemingly no fix in sight.

My back up camera fails to work consistently. This issue appears to only worsen with every use. Sometimes to screen will appear half on and half off. I have yet to receive any notice of a recall and would like to get this fixed if at all possible. Thank you!.

Rear backup camera suddenly stopped working and when in reverse the sensors kick in and breaks the vehicle when there's no object or vehicle behind. Also the code for the backup sensor came up but dealer didn't do anything.

Back up camera. When reversing cannot see out back window do to incline of glass making hard to reverse. The problem has not been reproduced or confirmed by a dealer or independent service center. The vehicle or component has not been inspected by the manufacturer, police, insurance representatives or others. There was not any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear.

At around 93k miles my hecu unit apparently malfunctioned at the same time as the left front tire speed indicator. All of my safety features abs, adaptive cruise control, lane departure, lane keeping etc do not work because of this.

Back up camera doesn’t work. When put in reverse the screen is static and when you press the back up camera button it won’t turn on.

My car has two warning lights on my dashboard. First one is check foward safety system. Second one is check Smart cruise control system. Both of them turned on when I was driving in the middle of a highway. These warning lights activated out of the blue, without any unusual circumstances. I cannot use my Smart cruise control system and the car is not able to alert me about forward collision. This issue has already been addressed through a recall for my vehicle's model and year in korea. My vehicle was produced in korea and was imported to the united states; however, Hyundai has not issued a recall regarding the same problem in the united states. This is a safety concern, and Hyundai should repair it free of charge, and the company should compensate customers who have already undergone repairs for the repair costs.

I was driving on the highway at the posted speed limit when the warning "check forward safety system" came up and remained on my dashboard. The cruise control stopped working also. The light remained on even after stopping and starting the car and has remained on ever since. I have never been in an accident nor has my computer system reported any collision. My Hyundai blue link app gives me the following dtc: c162078. It started on 2/7/2024. My collision detection system does not appear to be working at all and my cruise control no longer works. I'm very concerned about it malfunctioning based on other entries on the NHTSA. Gov website. I took the car to Hyundai service center and they are trying to convince me this is due to a collision and warranty will not be covering it. They tried to charge me for diagnostic even though I already had the error code on the Hyundai bluelink app. They confirmed that my computer has zero reports of any collisions. The service tech said, and I'm quoting, "the system is very sensitive and a swift kick could cause it to malfunction. " that sounds like a manufacturing defect to me. I have never been in an accident with this car, there is zero visible damage to the front bumper, and my computer has no report of an accident. The dealership urged me to contact insurance. My major insurance company told me this was absurd, would never be approved, and is clearly mechanical. They also mentioned anecdotally that this problem has been coming up a lot for them with modern Hyundai models. Then I called Hyundai corporate and they have escalated the issue, agree it sounds mechanical, and will be contacting me in 3-5 business days. They apologized profusely so I am still holding out hope for warranty coverage. I believe the dealership is trying to blame me for this mechanical failure to avoid expense on their end. I have had many software-related issues with this car.

I have had to get the horn replaced on my Elantra six times the horn goes out and this can be a very big safety hazard as it has caused people to almost hit me because they didn’t see me and my horn wasn’t working to alert them this needs to be addressed as soon as possible as this could cause someone to lose their life in the wrong instance.

Constant sound of flowing water throughout the front of the vehicle. Several service appointments later and there is still no solution to the issue that has been going on for over a year. Thia can be heard like a stream of water flowing. Engine ticking, loud rattling from engine. You can hear in from inside of the car.

When driving at 55mph with cruise control on, the car suddenly accelerated to 75mph, this happened on the open road and was able to keep under control. Auto has less than 10,000 miles. I will be contacting Hyundai customer service for a case number on this incident. First indication of a problem was cruise control, auto braking failed iin June of 2023. This follows a replacement of defective front radar unit by Hyundai which was replaced at 8295 miles on July 26, 2023. This problem first occurred in late June/early July of 2023. There was no warning.

I keep getting intermittent hev warnings and 12-volt light. The engine then shuts down and I have no power. This has occurred several times while on the highway and this creates a safety hazard. I have been fortunate enough that this happened while I was close to the shoulder, otherwise, it could have been critical. - the failed component(s) are the 12 volt battery and engine shutdown - with the vehicle being without power while on the highway puts other drivers and myself at risk of an accident - I have taken the vehicle to two different Hyundai dealers and they have not resolved the problem - the issue was escalated to the manufacturer Hyundai motors and they have not resolved this issue. - the 12v battery light and an hev warning light comes on and then the engine shuts off - this issue has been happening intermittently for the past year and I first notice it on October of 2022.

My car has 76,000 miles on it fully maintained and recorded at Hyundai dealerships. One day I’m driving and a check engine light pops up the same day I get it taken in to have it diagnosed, few hours go by I get a call they tell me that the integrated thermal management module on my car has burnt out. I was surprised because my car is fairly new I asked them how could it prematurely fail they could not give me answer and they told me I would have to pay out of pocket for it and I did. They advised me that I should not drive the car as it could pose severe risk to engine failure as coolant is connected to the part in question. So I left my car there and they ordered a new part and it got fixed the very next day, it was ready for me to pick up. I’m frustrated because I’m not the only one who had this problem and warranty did not cover Hyundai did not want to work with me to resolve my issue and as a result it costed me money and time. I’m not the only one who has this problem but is it really safe for my car to have this part if it could cause engine damage worse fire in that area due to a design flaw.

My 2021 hyunadai Elantra hev blue 12v battery light comes on and I lose power to the engine and all internal electrical components. It has happened while driving on the highway and it is a safety concern. I have addressed it with the dealership and they stated there were no codes and they canot replicate.

Engine shots off while on the automatic stop and go idle . It is being doing it for a while but it is happening more often even with the auto idle off and it even happened at the freeway. It gives me a message to put it in park or neutral and turn the engine on manually. Making this a very dangerous situation because cars behind me don’t know that my engine suddenly shots off. Thanks.

The h e v warning light comes on when driving. The hybrid battery disconnects from the engine and the car is undriveable. Have to pull over, stop the car, turn off the car and then reset the hybrid battery. This has happened twice in last week. Thank fully I was able to pull over safely, but this a dangerous situation for me and other cars around me. The car had been taken to the dealership just two weeks ago and they were unable to diagnose the issue.

The contact owned a 2021 Hyundai Elantra. The contact stated that the vehicle was parked unattended. Approximately thirteen hours later, he was notified by the fire department that the vehicle had caught fire. A police report was filed. There were no reported injuries. The vehicle was parked where the fire occurred. The local dealer was contacted but the vehicle was not diagnosed or repaired. The vehicle was towed to an impound lot and later the contact's insurance provider declared the vehicle a total loss, the cause was assumed to be electrical. The manufacturer was contacted but no additional assistance was provided. The failure mileage was approximately 24,000.

On three occasions while turning out into an intersection my steering wheel will lock up and my forward collision warning system will engage and my just stop in the road. Out of those three times, my car has been towed to the dealership twice. The dealer has been working very hard to identify the issue while working with Hyundai tech services. They have poured countless hours and money into this car and still have not been able to identify and correct it. My vehicle has become a deathtrap waiting to happen.

I am writing to report a serious and ongoing safety issue with my 2021 Hyundai Elantra hybrid that remains unresolved despite multiple visits to Hyundai service centers and independent repair shops. I’ve also found numerous consumer discussions online describing nearly identical issues with the same model and newer Elantra hybrid models, suggesting this may be part of a wider systemic defect. The core issue lies within the vehicle’s hybrid system. Shortly after a recent system/software update performed at a Hyundai dealership, a warning message began appearing at random intervals stating: “check hybrid system. ” this typically first appears after extended driving — often around 3 hours — but once it occurs, the issue worsens if I continue to drive. Each time the warning appears, the vehicle suddenly and drastically decelerates without driver input, becoming dangerously slow and unresponsive, even while traveling at highway speeds. This creates an urgent safety risk, as I have had to maneuver off the road quickly to avoid collisions. After the initial warning, if I attempt to drive the vehicle again without sufficient downtime, the warning reappears much more frequently — sometimes within minutes. The only temporary relief is to stop using the vehicle and allow it to rest for at least six hours, after which the issue may temporarily subside. In every case, I must use the 12v battery reset button to restart the car, which I suspect may be clearing diagnostic codes before they can be properly recorded. Notably, the check engine light disappears after this reset, even if it was previously displayed. Given that the hybrid battery is located beneath the rear passenger seat, I am deeply concerned that if there is an underlying thermal or electrical issue, it could pose a serious or life-threatening risk to passengers. To date, no dealership or technician has been able to duplicate or permanently resolve the problem.

Since last year around 55k miles, my backup camera has stoped working. The first incident happened as I was about to back out of my garage. I opened the garage door and put my car into reverse. As I looked down at the screen and began to back up, I realized the screen showed me an image of a closed garage door ever though the door was open. Almost as if it had taken a screenshot or froze. The second occurrence was similar except it was when I was parking in a job site parking lot. When I put my car in reverse to park, what came on my screen was the image of the highway about 15 minutes prior. I’ve had several experiences like this where the backup camera freezes, has static-like lines all over the screen, discoloration, or delayed effects. This is dangerous because if someone is looking down at the screen and doesn’t realize the backup camera is giving an incorrect output, this can result in an accident (whether it be a single car or multiple car accident). This is because you can end up hitting something/someone if you get delayed feedback on the camera and don’t realize.

I had reported that the horn wouldn't work. . Especially in cold weather last winter. The horn would work by the time I arrived at dealer. Told nothing they could do as it was working. It has happened 3 times in the last 2 months, finally totally nonfunctional the past 3 days. I called, stopped at dealer to have it checked. The car was returned to me with service person telling me that the horns diaphragm is stuck. When asked if working , he said for "right now. " he told me a new horn(s) were ordered. I asked him what he did: he replied, I hit the horn with a rubber hammer until it worked! well, one mile or so down the road, it didn't work. I checked the internet and there are multiple instances listed of ongoing issues with the horns on Hyundai vehicles. In the end, I am driving with some hesitance as the horn isn't working. This is not acceptable in a car 1. 5 years in my opinion. Again, after checking on the nhssa website, no recalls or mention of this safety issue! please escalate this to top priority! if not, anyone's injury or death is worth the wait!.

The contact owns a 2021 Hyundai Elantra. The contact stated while driving 30 mph, the vehicle decelerated and lost motive power. The contact stated that the vehicle went into limp mode. The vehicle was taken to the dealer on three occasions; however, the vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure, and a case was filed. The failure mileage was approximately 61,000.

Car problems started with back up camera not working, it has caused dash lights to go out, headlights to go out while driving safety sensors to sound for no reason. I have also started having problems with radio flashing and going blank. The vehicle has been checked by Hyundai dealer they did say back up camera bad but no answers for rest of issues. There were no warning lights prior to any of these problems. I still do not know what is really wrong and cannot drive vehicle at night or bad weather for fear of losing headlights. Vehicle is 2021 Hyundai Elantra with 10,500 miles on it.

While driving on the freeway around 70 mph the car seems to reboot, it slows down and coast and the dash computers shutdown and restarts.

A squirrel chewed my wiring into the temperature coolant sensor. I had to have two different rental cars for six weeks before I received my car back. Nothing happened to those vehicles during those six weeks. Within a week of having my car (2021 Elantra) back, a squirrel chewed more wiring. My car is now needing another repair. This is a known issue with Hyundai as well as other makers. I feel it’s pretty compelling evidence that there is a problem as two vehicles were not bothered by squirrels for six weeks and then my car comes back and it gets chewed up again right away. All cars were parked on my driveway.

The headlights and back lights turn off at random times when the headlights are on the automatic setting. This problem happens very frequently at night, putting my family at risk when the lights go off and cannot see what is ahead of us. In addition to a cop pulling me over for not having my lights on and he asked me if I was playing with the lights since they were going on and off and luckily the cop did not give me a ticket when I explained and he saw the problem (he advised me to get on this website and to make a report). I have reported this problem to the Hyundai dealership for the past 3 years and I don’t even think they take the time to investigate. The dealership just keeps telling me that with another update in the software is going to get fixed. But that is not the case. This is a very dangerous problem that is going to get someone killed. Need to be fixed.

At about 11 months old my car suddenly seized while attempting to enter the highway. This came with no type of warning from the vehicle until the car had stopped and then every light on the cluster came on. I was fortunate not to be rear ended. The car was towed and 2 days later the dealership called to tell me there were no errors and nothing was wrong with the car. I told them what had happened and they called later that day and I was informed that they needed to install and entire new engine assembly. The car only had 7000 miles on it and should not need a new engine. There is some major design flaw with this car which poses a safety issue. Additionally I looked at my service records for the car and it looks as if the dealership is trying to cover up the fact that a new engine was placed in the vehicle as it is listed as routine maintenance. Please look into this and contact me if needed.

Twice now when starting the car all the driver safety systems will show a warning that they are not working and the message is that the car is not save to drive. A bunch of warning signs will go off and the wheel locks. The brake system has also locked up. I captured it on video, but it won’t let me upload it here.

When I start up my car all the warning lights appear on my dash. When I try to drive the vehicle I have no control over the steering wheel or brakes. This is the second time this happened to me.

On August 17, my new Elantra lost power steering, and most safety related features. Most all instrument warning lights came on. Was able to get car to dealer service where they kept car overnight, and reset the error lights. They told me, they recorded the computer codes, but could not find the cause of the problem. On August 26, again the instrument warning lights suddenly came on again. Took car to dealer service, where they kept car almost 2 weeks, but could not find the cause. They recorded computer codes. I contacted Hyundai, and a case number was established, but no fix has been found. Case worker has been difficult to reach. My wife refuses to drive this car. New electrical problems: 1. Driver's door handle light not working at night when approaching door. 2. Receiving false emails that car doors are not locked, but they are locked. 3. Using myhundai, shows door are not locked, but they are. When using application to lock doors, false message back that a door is open. 4. Navigation cuts off intermittently. 6. Gasoline consumption computer resets sometimes, other times it does not. 7. Remote start application does not work, says my door is open. 8. Items missing from center display menus. (door light, reset gas mileage etc) car has to go back to dealer service for needed repairs.