Electrical System Problems of Hyundai Sonata - part 1

On the freeway at night when headlights and back lights quit working. Got off freeway and were able to temporarily fix it. A few months later while parked in driveway and not in use for a couple of days, lights came on without our knowledge and drained our battery. Neighbor alerted us to the situation.

See all problems of the 2011 Hyundai Sonata 🔎.

The left blinker switch keeps going in and out, working about 50% of the time. Both the light and the blinker sound do not turn on. When getting it checked out at an auto repair shop, the maintenance tech said this was more and more common for 2021 Sonatas and it was not due to anything I did. It was a multifunction switch problem.

See all problems of the 2021 Hyundai Sonata 🔎.

I was heading to work when suddenly smoke started pouring from the air conditioning vents, and the abs and traction control warning lights came on. I hit the brakes to pull over, only to realize I had lost braking power. I managed to steer to the side of the road as carefully as possible and bring the car to a stop—despite having no brakes and a fire burning under the hood. I tried downshifting to slow the vehicle, but the transmission didn't respond, and the cabin began filling with smoke. Once I stopped, there was nothing I could do to extinguish the fire, as the car was completely consumed within seconds. It was a fire in the engine bay; I lost the brakes, and the abs and traction control lights lit up. I assume it was a critical failure in the braking system, most likely involving the abs module.

Fan motor fuse box quit working and ac/heat no longer operational. First time was around October 21, 2025.

See all problems of the 2020 Hyundai Sonata 🔎.

I am writing to report a direct violation of the theta ii class action settlement terms by Hyundai motor America. This morning , I emailed an executive case manager explicitly explaining that my 2017 Sonata has an active p1326 code, has the 2019 ksds update, and requires a mandatory diagnostic under NHTSA recall 17v226 that cannot be denied due to a salvage title. Instead of replying to my facts, the case manager kathy gave me a hard denial falsely framing my federal recall safety request as a "voluntary goodwill warranty" issue to justify her rejection. Please help me in getting authorization my car with Hyundai dealership in plano TX to run the bearing rod test and get it fixed.

See all problems of the 2017 Hyundai Sonata 🔎.

My vehicle while driving, it is jerking and shaking. When I come to a stop, the cars rpms go up and down while the car is shaking. When I pressed the gas pedal to accelerate the car will not accelerate as normal and the car jerks as I’m driving it. The rpms rev up and down without any pressure placed on the gas pedal. The check engine light came on. The miles per hour only allows me to put one digit. I wanted to clarify that the problem is occurring anywhere between 0 mph to 65 mph when these the car jerks and shakes and the rpms go up and down without me pressure on the gas pedal.

This vehicle had a recall, 201, for the Smart junction box. This was due to the blinkers not working properly. The software update was performed, however, the problem still exists. This was due to the Smart junction box. Now, aside from the blinker issue, the ac stays on when the engine is turned off, lights come on by themselves, the media screen goes randomly into night mode, daylight running lights are constantly in night mode, Smart junction box failure. I have not taken this to a mechanic as of yet, the dealership is aware, and I opened a case with Hyundai case #42940056, however, I have not received a call from my service advisor or Hyundai. They offered to do diagnostics, but, if these problems are not about the safety recall, I would have to pay $350 for diagnostics, unless I get the problem fixed by them. This car has 66k miles with a new engine installed at 59400 miles! at this point, I have the car parked, battery disconnected, and looking for the most efficient way to fix the problem, which must be performed by specialized equipment.

See all problems of the 2015 Hyundai Sonata 🔎.

I was driving my 2014 Hyundai Sonata that I only had for 3 months when it just quit on me. I pulled over and seen when white smoke was coming from the wires.

See all problems of the 2014 Hyundai Sonata 🔎.

Once again I am having to replace a bulb for my vehicle. This will be the second time in 3 months I have had to replace my rear blinker bulb. Not including the 4-5 times per year I have to replace headlight bulbs. This time the wiring has melted and the bulb has nearly melted the lens cover. I only buy the exact oem recommended bulb every time. Nothing fancy. Just the basic old school bulbs. Every year model around mine has been recalled for this exact issue.

No air coming from cabin, upon further inspection found melted multifuse with melting terminal pin area in fuse box. No prior signs of warning, leaving vehicle without operable air condition for high temperatures.

I was driving and all of a sudden the traction lights turned on and the sterring wheel is hard to turn. Almost go in a car accident. The windows just stopped working and the brakes light constantly keep getting burned out.

The vehicle is stalling in the acceleration process. I can feel and hear the stall by the air conditioner going out or fading out when it happens while driving. Pressing the gas and it barely moves at times. Makes a noise now while running. Unknown to whether it's electrical or engine or transmission. Pull out in the traffic accelerating but the car wasn't moving at the pace it should have. Could have cause an accident when trying to cross on going traffic. Just got the vehicle 2 weeks ago. No one has inspected the vehicle yet. Going to have it looked at for recalls. No warning lights appeared to reflect an issue, but there clearly is.

See all problems of the 2025 Hyundai Sonata 🔎.

The contact owns a 2022 Hyundai Sonata. The contact stated that while driving at an undisclosed speed, the hvac blower motor became inoperable with no warning light illuminated. The vehicle was taken to the dealer, where it was diagnosed that the blower motor fuse had melted and failed and needed to be replaced. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 70,000.

See all problems of the 2022 Hyundai Sonata 🔎.

1. ) following Hyundai's 9c2 campaign update for the ecu that was completed back on may 27th, 2026, my 2015 Sonata went into limp mode [solid check engine light present] while I was accelerating up an on-ramp on the 2nd drive cycle since the update was performed. I was already far away from the dealership so I was forced to limp it to my local shop that I regularly use to have it checked out. It was confirmed that the code on the vehicle was p200a for intake manifold runners. Since the update was for smog regulation, the code was cleared in order to see if it would come back. Since then, it has not, however the vehicle continues to have one persistent problem. The rpms will dramatically dip and then surge back upwards while the car is coasting (no gas and no brake applied). 70% of the time, you can feel the car violently jerk as it appears to try and correct itself. 2. ) I've brought this car to multiple dealerships, have a case open with corporate and have also found that this is a systemic issue with this specific update in these cars. All and all, nothing has been done. I'm repeatedly turned away over and over again because their techs are only permitted to look into it once they have hard evidence of a fault. In this case, that would be a dashboard light. I'm told that I may only return if the check engine light comes back, which as I mentioned previously, posed a huge safety risk to myself the first time it appeared. If I can only go 55mph down the highway, I am at risk of being rear-ended or struck in some way. 3. ) the problem has not been reproduced by the dealer as they will not test drive it to see the dip and spike. However, the code was still pending for awhile in the vehicle before it cleared it on its own, so that was acknowledged by at least one place. 4. ) vehicle has not been inspected by anyone but a dealership and local mechanic. 5. ) no other signs prior to the vehicle limping out on me other than some acceleration concerns on may 27th, 2026.

May 23rd, 2026, vehicle dash and navigation screens went black while driving on freeway. May 26th, 2026, vehicle battery completely drained. Purchased new battery and the same thing happened. Took the vehcile 3x to Hyundai dealership, switched out battery for a brand new oem one. June 10th, vehicle died again, battery was completely drained. Dealership said its not the alternator but only jumped the vehcile since they couldn't figure out the issue. July 11th, 2026, vehcile died for 4th time and had to jumped again. Tested battery by tow truck driver, battery was drained but alternator fine.

See all problems of the 2024 Hyundai Sonata 🔎.

Went from 65 and dropped down to 40 going up grades on the freeway. Started shaking, check engine light went on and electric battery disappeared from dash. Got to top of grade, went back to normal. Problem repeated on next grades. Car had just left dealership lot an hour prior where it was safety inspected and they said all was fine. Took back to dealership for inspection and they said that there were no codes showing for what happened and all was well with the vehicle, when obviously it was not.

See all problems of the 2016 Hyundai Sonata 🔎.

The cars fan is constantly running even when the car is cool. I think it has to do with the itms I contacted the dealer and they said there’s nothing they can do about it this happens every time the vehicle is started even when I am parked. The fan is constantly running at 100%.

We were backing up and leaving a parking space when the emergency braking system overrode our driving and forced a stop. This has happened many times, once while turning at a red light (which we had the right-of-way) and our car stopped on the middle of the intersection. Another time was during a turn in a non-traffic light turn lane where timing is important. Our car was again completely stopped in the middle of the road in oncoming traffic.

On my 2011 Hyundai Sonata GLS, both rear tail lights have melted to the point that the lightbulbs cannot be extracted and the brake and tail lights no longer work. When I looked into this, I found out this is a common issue on 2011 Hyundai Sonatas. It is almost always caused by excessive heat from the standard incandescent bulbs, which damages the wiring harness and deforms the plastic housing. When I called the closest Hyundai dealer (in chico, California), they told me the warranty had expired last year and that I should have received a notice about it after I obtained ownership of the car in March 2025 (a little over a year ago). However, I did not receive a notice about this. Since the tail lights do not work properly as a result of this problem, it is a safety issue as it could cause an accident. It should be a recall repair instead of a warranty that expires. My car is still well under the 200,000 mile limit that was set on the extended warranty, but they're refusing to honor that because of the warranty being expired.

Car just stated making g noise went into lp. Mode now saying k ock sensor.

I have a Hyundai Sonata 2017 one year after I bought the car I started having acceleration problems. I have had the throttle changed and the valve gasket cover repaired. On April 15, 2026 the check engine light came on. On April 29th I got theta 2 emissions update installed at Hyundai auburn, al. I took it too auto zone the same day the code p1326 was showing up and p0014. On may 5th my car entered limp mode for excessive oil leakage, I got an oil change April 6, 2026. My car has never done that until the update was installed. I get my oil changed every 6 months and also have sent them records. They denied my claim due to lack of maintenance.

This is a well-known and widely reported issue: 2013 Hyundai Sonata hybrid car, which has recently experienced the following dashboard alert: "hybrid system warning! safely stop and do not drive. " when the car is pulled over and shut down and sits for roughly 10 minutes, it starts up just fine and runs again for an undetermined amount of time, and then the alert will go off unexpectedly. This has happened twice, once the car was driven about 4 miles, and the alert came on, and the second time the alert came on as the car was started for the first time of the day. The car repair shop indicates that there are no codes saved when this happens. This is apparently a documented issue, where the codes are not saved, and difficult to diagnose by repair shops and dealers. It could lead to the vehicle completely shutting down while driving at highway speeds within traffic, which could cause a serious accident involving multiple vehicles and people. Why is this not recalled by the dealer and fixed? this has been reviewed by the dealer and by an independent repair shop. Is the NHTSA waiting for the death count to require the manufacturer to address the issue?.

See all problems of the 2013 Hyundai Sonata 🔎.

I wanted to report the failure of my rear camera and/or the electrical circuit that is tied to it. It's my understanding that Hyundai has issued multiple recalls across different years/vehicles for issues in this area. My 2019 Sonata is not included in those current recalls. I was without my vehicle for a week and was charged over $1600 to repair. The issue was diagnosed and repaired by an independent mechanic. When they system failed numerous error lights/warning went off and continued to cycle thru (plus beeping). I wanted to report this in hopes of continued pressure on Hyundai to add this model/year to their recalls.

See all problems of the 2019 Hyundai Sonata 🔎.

On April 14, 2026, my 2019 Hyundai Sonata was parked at a retail store parking lot. Returning from the store, I attempted to start the car, and it did not start. I attempted to start it again, and I saw smoke coming out from under the hood. I immediately exited the vehicle and opened the hood. I saw open flames coming out of the engine area, about 4” high. I called 911 and waited about 10 minutes for the fire department to arrive. During this time, the flames engulfed the entire engine compartment and extended vertically above the hood height. The hood eventually melted and fell back onto the engine area. The fire department came and put out the fire. The car is totaled. There were no injuries, thank god!.

Supplemental information to existing NHTSA complaint involving a 2017 Hyundai Sonata plug-in hybrid (VIN: [xxx] ) while traveling at approximately 70 mph on a heavily traveled highway, the vehicle suddenly and completely lost propulsion without warning. The vehicle rapidly decelerated in traffic, creating a significant safety hazard for my family and surrounding motorists and requiring emergency maneuvering to reach the shoulder. The vehicle was towed to an authorized Hyundai dealership, where diagnostic testing identified multiple high-voltage battery system fault codes: • p0b68 • p0b6d • p0b72 the dealership diagnosed a high-voltage battery system failure requiring battery replacement. The vehicle is currently non-drivable. During my research, I found multiple owner reports involving Hyundai Sonata hybrid and plug-in hybrid vehicles experiencing loss of power, hybrid system failures, limp mode conditions, and propulsion-related incidents. I also learned that Hyundai previously issued recall 18v166000 involving 2016–2018 Sonata plug-in hybrid vehicles due to battery management system and voltage protection device concerns that could result in loss of power while driving. Dealer says does appply for my car. Although my vehicle’s fault codes may differ from those addressed in the recall, both involve battery-related failures capable of affecting propulsion and creating a highway safety risk. My concern extends beyond my individual vehicle. A high-voltage battery or battery management system failure that can cause a complete loss of propulsion at highway speed without warning presents a potentially serious safety risk. I respectfully request that NHTSA evaluate whether similar incidents involving Hyundai Sonata hybrid and plug-in hybrid vehicles indicate a broader safety concern warranting further review. I can provide dealership diagnostic reports, repair estimates, towing records, photos, and videos upon request. Thank you for your consideration, [xxx] information redacted pursuant to the freedom of informati.

The car will idle high around 1200 rpms. The car will most of the times fix the issue when you turn the car off and back on but it will start again after driving. This is a known issue with the car. I have had the egr valve replaced since it will pop up the codes p240f and p049 for egr slow response and control position exceeded learning limit but the problem came back within two days. I did find a forum that deals with the joint connector repair but this needs to be a recall as I have come across many people who have this problem and paying out of pocket to fix it.

Intermittent issue. On startup, the hvac system cycles through the modes and gets stuck blowing on mixed mode (face and feet) regardless of what mode is selected. The problem is temporarily fixed by manually tapping the mode button until the desired mode is selected.

My 2011 Hyundai Sonata experienced a flashing check engine light and entered limp mode (vehicle cannot accelerate), displaying diagnostic code p1326. This code is associated with Hyundai’s knock sensor detection system (ksds), which was installed as part of a recall-related campaign to detect engine bearing failure in theta ii engines. The vehicle previously had its engine replaced under recall due to known defects involving connecting rod bearing failure. The current condition renders the vehicle unsafe to operate, as it is limited in power and may stall or fail unexpectedly. The system is designed to detect potential engine failure, which is a known safety issue. Despite this, the dealership has not completed proper diagnostic procedures related to the ksds system and potential engine failure. The vehicle has been out of service for approximately one month without resolution. This appears to involve a failure of a recall-related safety system (ksds) and/or a recurring engine defect that Hyundai has previously acknowledged. My biggest concern is that they are diagnosing this issue as an electrical defect rather than the engine itself (which the system is design to warn about) in order to avoid having the repairs covered under the warranty that originated due to the class action lawsuit, and this component was only created and provided to consumers with no charge in order to protect the company from having to continue replacing defective engines.

While I was driving my car wouldn’t go no higher than 60mph and kept dropping speed but I came to a stop and when I stopped the car was smoking. I heard knocking noise and rumbling noise on the passenger side. It wouldn’t start again.

See all problems of the 2012 Hyundai Sonata 🔎.

The back up camera sometimes is only a black screen, it is random and has done it in all sorts of weather. Usually is corrected when vehicle is started next.

I was driving on the highway and the engine shut off but everything else remained on. I drifted to the breakdown lane and turned the car off. It would not start again and the car began acting up by turning lights on and off, telling me to check the tire pressure, and not unlocking the doors. I then saw some very light smoke from the engine compartment. I popped the hood and looked and saw a glow on the bottom side of the engine area. Then the car just went up in flames.

Here is your updated review with that included: ? I am very disappointed with Hyundai motor America and the service I received at Hyundai of renton. I own a 2017 Hyundai Sonata and received a letter about a required software update and ignition cylinder protector due to known theft issues. I went to the renton dealer for the recall service. They performed the software update and were supposed to install the ignition cylinder protector. Unfortunately, my car was later stolen because of this exact issue. The ignition was damaged during the theft, and I had to replace it myself just so I could drive the car. When I returned to the dealer, they refused to install the ignition cylinder protector, saying the ignition was broken. It was broken because of the theft — which happened due to Hyundai’s known defect. After the recall software update, my key fob also stopped working properly. I went back to the dealership, and they refused to fix or properly reprogram my key fob. On top of that, the service manager, john, was very rude and unprofessional. This has been the worst experience I’ve had with a vehicle and a dealership. Because of this situation. Very disappointed.

On Feb. 10, 2026, my Sonata began showing a blue screen on the infotainment screen when the vehicle was in reverse. The blue screen contained the message "incoming camera signal error. Please try again later. " between Feb. 10 and 22, I continued seeing the aforementioned blue screen and message. In addition, I began seeing a green screen with a message "no camera signal received. Please try again later. ”. On Feb. 22, I was attempting to reverse from my garage and my camera failed to engage. I saw a black screen without picture when the car was first put in reverse, so I put in park and then switch back to reverse. The camera did not engage and the screen remained on the car's menu. Camera then flashed on briefly and then went back to the black screen, then moved multiple time between to the blue screen with the warning message “incoming camera signal error. Please try again later. ” and the green screen with message “no camera signal received. Please try again later. ” the issue eventually began occurring both while in reverse and in drive. During this time frame, I took the vehicle to the dealership on multiple occasions, Feb. 10 and Feb. 19, and they were unable to replicate the challenge. I took the vehicle back to the dealer on Feb. 23, and the issue was replicated. The issue was 'repaired' and picked up on Mar. 19, but had to return 3 hours later due to the same issue then in an exacerbated state. The issue was finally repaired on Apr. 1 after a complete floor assembly replacement. The issues caused the safety concern of limited visibility when driving.

While driving the vehicle the other night, the cars electrical system completely shut off for a few seconds before popping back on. The whole car inside and out went completely black. It was around 10pm on a dark country road. I had the seat heater on high and the defrost on high because it was cold. It appeared to happen when the auto high beams were supposed to engage. Instead of them engaging, the whole cars electrical system just shut off. No headlights, no instruments, interior lighting, console display, nothing worked. The car was in battery mode at the time, and it sounded like the whole car just shutoff. I took my foot off the accelerator wondering what happened, and before I could understand what was going on, everything came back on. It did not prompt me to start the vehicle again. The auto on/off brights never worked like they were supposed to again either. I had to manually engage and disengage them. Thankfully it was just me on that stretch of road going 30mph at the time or it could have ended badly.

Our 2022 Hyundai Sonata experienced multiple issues related to recalls affecting the vehicle’s reliability and operation. Due to these ongoing problems, the vehicle was taken to a dealership and has remained out of service and in dealership possession for approximately 90 days. The issues were confirmed by the dealership, and Hyundai motor America was involved in the case. As a result, Hyundai approved a full buyback of the vehicle, indicating the problems could not be resolved in a reasonable timeframe. Despite this, the vehicle remains out of service and unusable. Hyundai has failed to complete the buyback process and has not provided a resolution within a reasonable time. There have been repeated delays and missed timelines. The extended period without a functioning vehicle creates reliability concerns and potential safety risks, as the vehicle could not be safely depended on for regular use prior to being removed from service. The vehicle is currently still in dealership possession and unavailable for use.