Electrical System Problems of Hyundai Sonata - part 1

I was sold a 2024 Hyundai Sonata sel and while driving on the road multiple times the car completely shut off. By this all lights inside and outside the car turned off (headlights, interior lights and all) car was still rolling and I pulled over each time as all systems rebooted. It claimed that all seatbelts were off with the warning sign. Had to unbuckle and buckle all seatbelts for this warning to go away. Since the car completely shut off this put other drivers, my passengers, and myself at danger due to visibility. Luckily there was no traffic at the time but this keeps happening and it is worrying me.

See all problems of the 2024 Hyundai Sonata 🔎.

Unknown. 2018 Hyundai Sonata engine has failed. Only purchased the vehicle in December 2024, and the engine is defective. There is much information, via research, indicating that Hyundai is aware of the engine issues with this year vehicle, but are unwilling to make amends. Vehicle has 100,189 miles.

See all problems of the 2018 Hyundai Sonata 🔎.

Came off the highway to a stop sign went turn and the engine just seized and would not start no matter what I did. Had to have it towed to my house. Safety risk was just off the road so I did not get hit. Police stop and told me to get a tow truck. And no warning signs at all.

See all problems of the 2012 Hyundai Sonata 🔎.

The rubber stopper for the brake light switch on the brake pedal deteriorated and fell apart. This resulted in the brake lights remaining on constantly, cruise control being disabled, and low battery voltage.

See all problems of the 2015 Hyundai Sonata 🔎.

The contact owns a 2013 Hyundai Sonata. The contact stated that while driving at approximately 75 mph with three passengers inside the vehicle, the vehicle stalled. There were no warning lights illuminated or messages displayed prior to the failure and the vehicle shutting off. The vehicle could not able to be restarted. The vehicle was coasted off the exit to safety and then towed to the residence. The contact’s neighbor and son inspected the battery but found no fault with the vehicle. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was 135,000.

See all problems of the 2013 Hyundai Sonata 🔎.

Car sits several days at a time. Door locked. 12 volt auxiliary battery goes dead within 60 minutes after driving 60 miles. Happened 6 times in last 6 weeks. Battery is lithium. Dealer looked at car sept 8. They did cursory check and said my rodent deterrent caused issue. After driving 60 miles. Turned rodent deterrent off. Still have issue. Car resets the 12 volt battery nearly daily. Lithium battery if bad can blow up and cause vehicle fire. Car is parked in car port next to house. If fire, it burns up my house also. This is fire hazard. If the battery is bad, it must be fixed. Car under 10 year 100,000 mile bumper to bumper warranty. I need car fixed. Not just looked at. This is fire hazard till it is fixed,.

See all problems of the 2021 Hyundai Sonata 🔎.

I have tried to have my Sonata 2013 gone over gor the previous ownership never gave me any ro in this bias was stared. This previous wherebpurchased and worked , was not on the the up and up. Vwhere ,steele Hyundaibwhen owned know keating group purchased. I'm asking ngo iver the safety I the setvice ussues t hat Hyundai is awarevand have all thr campsign numbers looked up I do not believe since ive oened the car ,sonata anythingbwas donen,agein nothing evervstated and knly oil changes done without any given paper wirk given on recalls except oil changes. Ssues and . So wanting, asking that no chargeb,go iver make sure for the situation posted and Hyundai posts in 6bareas yes , go over for the brake system is causing the hybird tobshit down and the car with squiggly line know comes on fuses and the the brake power booster sensor is the problem gor I had the Sonatanon computer that came up also shavings in the engine campaign 162,994 251 to go iver no charge to make sure it was done and whatever faulty be replaced no charge . Charge to Hyundai for the problems if safety and service are on line stating should be taken care if no charge to consumer. Nothing is happening, just the insanity definition, to resolve. I ask forba new case manager I'm entitled to, can't turn down ,but is and lies about contact. Once, returned call no return call. Hope in the next 24 hours this be resolved so I can have this situation at no charge,don't believe ever done,no paper work in my possession, never had oil changes. Never told ,never anything from Hyundai. Almost got reat ended will send bill any to Hyundai tontalje carebofbas well something know NHTSA isn't helping after many complaints as this. Hyundai admits no charge for t his situation ,insanity and no cooperation just arrogance and belligerence . Mileage has nothing to do with. Engine should be looked at for whatnot NHTSA rant about engine in my Sonata hybird and engine,problem still exists at.

This has been going on nothing resolved and no cooperation. Im going yo locate an attorney that really don't want to. Requesting this be ,the situation be loojedvatb,at no chargevand replace whatbwasvsuppisedly replaced by steele south loop Hyundai ,houston texas ,sold to keating groupbbased out if texas. What I'm asking isn't make sure itvwas done ,and whatever replaced ,inexpensive to do to. Repkace the parts , and computerbprograned to make current no chsrgebto ne for Hyundaibsta t ES in line and would not be getting emails from NHTSA as I do . Hope finally 24 hours resolve, cooperation and done finally.

Pushed acceleration at traffic light to cross and turn into neighborhood, car started beeping frantically, 'check hev system' flashed on dash as well as 'turn off engine' while car decelerated to 1-3 mph. Battery meter bar on left side of dash completely depleted showing no battery power supply at all. Turned vehicle off for a few minutes then restarted. Put the vehicle in drive gear and same warnings appear, car doesn't even accelerate when gas pedal is pressed fully, stays at 1-3 mph crawl. Vehicle stalls out after 30 seconds, vehicle turns on but cannot start.

See all problems of the 2016 Hyundai Sonata 🔎.

Oil leak on alternator engine leaking oil from the front cylinder bank’s valve cover or from the valve cover’s gasket onto the alternator. An unknown amount of oil damaged the alternator resulting in illumination of the charging system warning lamp and disablement of the charging system. If the vehicle is continually driven with a disabled charging system, the engine can shut off, increasing the risk of a crash.

See all problems of the 2009 Hyundai Sonata 🔎.

2021 Hyundai Sonata with approximately 39,000 miles. On 8/21/2025, the dashboard displayed the following message "shifter system malfunction! service immediately" when the warning appeared, the vehicle shifter button would not function, creating a traffic safety risk. History: dealer service history shows the transmission was replaced on the vehicle under warranty on 08/30/2021 with 2,212 miles with no campaign/recall issued. Dealer states there is no recall campaign on this vehicles specific VIN # and NHTSA currently shows no open recalls for this vehicle. However, Hyundai advertises an 8-speed dct safety recall for the same year, make and model, and describes this identical issue, but has left this vehicle's VIN# out of scope for this recall, which is continuing to demonstrate the same issues. Current dealer/manufacturer response: on 9/4/2025, the dealer declined warranty or recall repair unless the fault was active on their diagnostic scan at the moment the scan was performed. A photo was provided to the mechanics of the dashboard showing the transmission service warning, with current mileage. The dealer advised there were no diagnostic log history showing the transmission error code even with photographic proof and attempted to return the vehicle to me. I have rejected the return of the vehicle and advised that this needs to be escalated, because if logs are not appearing, this is even a bigger cause for concern and that the vehicle is a safety hazard. Concern: because this vehicle required an early transmission replacement and is now exhibiting new transmission/shifter warnings, I am concerned the failure relates to the known transmission/shifter recall on this model and that the recall scope and/or remedy is incomplete for the affected vehicles including my VIN #. It is also possible the dealership is attempting to run out the warranty which expires in 3 months. Vehicle, photo of the warning, and service records are available for inspection.

Vehicle will not start. This is the fourth incident where vehicle will not start. It has had the software update, battery and voltage regulator replaced in the summer of 2025. In Aug of 2025, vehicle will not start with jump or use of 12v battery in vehicle.

See all problems of the 2022 Hyundai Sonata 🔎.

Car turned off at light all lights work and turns on engine won’t roll over the battery and alternator and starter are all good.

I am driving and all of a sudden the brakevsystem lighthouse on bthe hybird system begins to fail and ge car loses power I almost got hit 4 times already, from this . The system starts to ding ,shut down and states to bring to a certified mechanic ir dealership. Hyundai has on line tgeybarevaware and this problem for this model and should be taken care if no charge for bis a problem for this year model and hybird model 3 diff we rent areas on lounge through Hyundai it states this a known issue. The part to replace and had a certified ase mechanic on computer look and went through the computer system and stated it is a power booster brake sensor. This is starednin 3 different areas bon Hyundai websitebfornthe model and year. Suppised the recall in the nowhere done oct 8 2024 but never had any letter of recall nor the dealership contact me anmboutbthis ,but had an oil change done at or about the supposed nrevapl been done. I have no documentation of this nor any given so inwantb,asking give me type kit needed, to take care nofbthis. . No documentation ofbanybkjnd given exceptb,no invoice given done, so I would like tge kit for fuses do go bad. Anything can be put in computer stating what is supposed done but not. Im not asking except to rake carebof this no charge for Hyundai it's free in 3 different areas should be done non published recall . For this year. All online. I asked for cooperation in this matterband the dealership that purchased has been sold to anormther and banner dealership stated in line ,not responsible for previous dealerships problems etc,take it up warmth them the steele group out if canada,that sold to ge jeating group that know owns this dealership . . I asked for a newbcasemmanager ,drniedband I have a rightbtocaskband should be changed for her arrogance, belligerence in nmattrr should not be. I purchasednthe brake booster sensorbforbwhat fred bactyally a little less with labor, beingshipped from Hyundai . Dot.

My Hyundai consumes oil and I have to put oil in it every two weeks! also my ignition coils has had to be changed 4 times. Also check engine light just came on code saying catalytic converter or oxygen sensor changed oxygen sensor a couple months ago. I purchased it brand new and as soon as I got over 100,000 miles nothing has been going good since then please help also my paint on the top of the car is starting to peel. Will never buy a Hyundai again.

See all problems of the 2017 Hyundai Sonata 🔎.

Without warning, symptoms of the a/c blower not working first occurred a little over a month ago. The fan just stopped blowing altogether (no cold or hot air). After turning the car and the a/c system on and off several times, it began working again and that was it. This past week, the same issue occurred intermittently over 3-4 days. The a/c blower did not come on for a day, the next morning it was functioning, that evening it stopped blowing again, and this went on for several days. Research of the symptoms via youtube and many online forums, and most importantly confirmation through visual inspection of the fuse box, confirmed that the blower fuse is burning so bad it has melted the connecting port in the fuse box. Whatever the electrical malfunction, the fuse burning and melting is disrupting the connection and ultimately the a/c blower itself. In the dead of such a hot and humid summer, it has been insufferable having to ride around with such inconsistent and intermittent air conditioning.

See all problems of the 2020 Hyundai Sonata 🔎.

The electrical in the entire car is malfunctioning. Sometimes the brake lights don’t work due to wiring, other times the seats control don’t work and the cables to battery is not connected/firing correctly. Has an entire electrical issue.

See all problems of the 2014 Hyundai Sonata 🔎.

This is on my 2021 Hyundai Sonata hybrid limited - for the 7th time the vehicle has been completely dead and unresponsive. I have had to gain entry to the vehicle using the manual key and press the "jump" button to get the vehicle to start. The Hyundai dealership ran a bunch of battery updates to the 12 volt battery several weeks ago and said that should hopefully fix the issue. Several weeks later on 07/19/2025 the vehicle was dead again. I had to use the key to manually gain entry and jump the car again. The dealership said that the 12 volt battery may need to be replaced and said that it is fully integrated with the hybrid battery system which is covered for 10 years/100k miles whichever comes first. I am still within the warranty period so hopefully Hyundai will fix the issue. From an online search, it appears this is not an uncommon issue with the Hyundai Sonata hybrid. I am waiting on Hyundai for a fix and for .

We were sitting in our car at a hardees drive through when we noticed smoke coming out from under the hood. I pulled forward to a parking space and opened the hood. Flames shot up at least 6 feet. I quickly ran a short distance into the fast food place and right near the door was a fire extinguisher, which I grabbed and put the fire out with. The fire burned for about a total of 2-3 minutes, and did not do excessive damage. Coil packs and wiring harness got most of the damage. With the hood closed, you cannot even tell there was a fire. I had the car towed to grayson Hyundai for the recall part, but then entered a claim to Hyundai. Long story short, they stalled me for over a month and then denied the claim. Citing no damage to the cam. Unlike most of the fires with this carline, my car fire was put out very quickly. The recalled fuel line/tube was not damaged much at all. You could inspect the part and see the wear on it and tell it was the culprit. It didn't take a trained mechanic to see this. After I put the fire out and it cooled, I tried starting it, and there was fuel squirting out from the recalled part. There is absolutely no doubt that the recalled part was the cause of the fire. But Hyundai has given me a denial letter that does not state the reason for denial. The Hyundai rep on the phone told me it had to do with no damage to the cam. I then asked, thats because I got the fire out so fast right? and he said no, didn't have anything to do with it. But he lied. First of all, the cam has nothing to do with the cause of the fire. A damaged cam only happens when the fire was long lasting and severe. They should have inspected the obvious recalled part right in front of them. This denial is completely unprofessional and hints of a concerted effort to categorically deny claims. They don't usually have this much evidence, they did this time and still blew it. Had I let it burn to the ground,=approved.

I have contacted the guy that sold me the car he refused to fix the recall which is my motor I need something done , Hyundai won’t honor their recall .

Purchased 2019 after 44,000 miles engine was replaced metal in engine and inverter coolant issue July 2025 117,000 my inverter coolant light came in and off several times then car through all warning lights hev check engine warning shut it down went into limp mode towed to dealership they checked and cleared codes said it threw 13 codes but after clearing they stated nothing wrong with it as they went to pull car around it happened again this time code was knock sensor which they relaxed at no charge extended warranty they next day after picking up while at idle hev warning went in shut car off and it was gone kept driving nonissues the next day again it happened and this time the engine light stayed on spoke with dealership they said they would charge me diagnosis charge of 208 and if it was related to what they did. It would be covered also stated if the engine light was flashing it would be covered or it isn’t the engine isn’t covered the inverter coolant is not bubbling or moving when car is on it is an inverter coolant issue that was a problem back when my first engine was repaired and should be covered I love my vehicle but I have had so many issues since getting it major things and the lighting system showing a black spot in my view as well that could not be fixed I will attach pictures of earning lights and video of coolant not circulating and the dealership filled the coolant way over the top I have to now take it back again to have it looked at.

See all problems of the 2019 Hyundai Sonata 🔎.

I started the car, put it into gear and then the breaks wouldn’t work. The car dash said something like check breaks hybrid system failure do not drive. There is not recall on my car but the Hyundai service department doesn’t know how to fix it. This is the second time it’s happened. I’m scared to drive it. Please investigate!.

Steering wheel warning light comes on traction control light comes on. Steering becomes difficult.

I drive a 2012 Hyundai Sonata limited. After a recent fill-up, I began experiencing delayed acceleration, engine hesitation, and what appears to be misfiring—especially at low throttle. Most notably, the brake lights stay illuminated even when the car is turned off, which drains the battery and poses a major safety hazard. I scanned the vehicle with an obd-ii scanner and received code p0504, which points to a brake light switch malfunction. I also noticed that pressing the start button with my foot off the brake still starts the engine instead of going into accessory mode—confirming abnormal brake signal behavior. I replaced the brake light switch, which temporarily fixed the issue, but the symptoms returned within a day. After researching, I found there was a recall (NHTSA 15v759000) for a nearly identical issue involving the brake light switch and stopper pad. However, my VIN is not listed, even though I am experiencing the same safety-critical symptoms. This issue poses a significant safety risk on the road, and I believe my vehicle should be included in the affected population of the recall or issued a technical service bulletin extension.

Initially vehicle battery is drained after three days of sitting in driveway and not being used. Vehicle has been taken in to dealership in July 2025 and found the 12v integrated battery was faulty and was replaced after being on backorder for three weeks. After battery was replaced the vehicle battery is drained after five days of sitting in driveway and not being used. No lights are left on, no aftermarket accessories are plugged in or attached to the electrical system. This has been an ongoing issue and the dealership I initially worked with has now had my car 3 different times and over four weeks and have stopped returning my phone calls. I have just sent my car do a different dealership and have been told it may take up to 2 months to diagnose the issue. I cannot open the door or start the car without using the emergency key, when I gain access to the car the 12v battery reset button rarely works to power the vehicle again. This is something that the dealerships are aware of, but have no idea what the actual problem is. Please for the love of god help.

The camshaft position sensor internal rubber plug is faulty and it allows oil to leak into the sensor housing. Ruining the sensor and the brushes and housing. It causes the check engine light to come on the idle races and car takes off on its own. Can’t drive it because it’s to dangerous. Once it takes off then it goes into limp mode and you can’t pull out because of no power. 40000 miles. The internet is full of owners having the same problem.

Every day the car is dead, have to take the manual key out pop door cover off unlock car manually push the 12v reset button and hold fob to start/stop button for car to work again. Happens daily.

The hvac blower motor and related electrical components (including the fuse box, wiring harness, or control module) have malfunctioned. The system either fails to operate entirely or works only on low, with unpredictable surging airflow. These components are still installed in the vehicle and available for inspection upon request. For the past five days, my family has been driving without a functioning air conditioner in extreme oklahoma summer heat. This is not only uncomfortable but unsafe, especially for my young child who regularly rides in the vehicle. In addition, without reliable airflow, we are unable to defog the windshield in humid conditions, which significantly reduces visibility and increases the risk of a crash. The inability to regulate cabin temperature and airflow poses a serious safety hazard. Yes, the issue has been observed by the dealership during service visits. However, Hyundai has denied goodwill repair assistance and has not formally acknowledged the defect, despite technical service bulletins and numerous similar reports from other owners. Yes, the vehicle has been inspected by an authorized Hyundai dealership as part of a multi-point inspection. No warning lamps or dashboard messages appeared. However, symptoms began nearly a month ago and have persisted, including intermittent blower operation, limited airflow regardless of settings, and occasional surging. While I have not personally noticed a burning smell, I’ve found numerous reports from other 2020–2021 Sonata owners describing complete blower failure and smoke smells, often tied to fuse box or electrical issues.

2011 Hyundai Sonata had a theta ii engine replaced in September 2024 after engine failure. Hyundai paid for the engine through the extended warranty on the theta engines. Check engine light is still illuminated after new engine and after multiple visits to the dealership, they say the wiring harness is bad. Contacted Hyundai corporate who said they will not pay for anymore warranty repairs, even though the wiring harness was damaged from the bad engine or during the replacement. From my understanding, it is dangerous to drive a car with a bad wiring harness due to fire risk, loss of power, or loss of safety components.

See all problems of the 2011 Hyundai Sonata 🔎.

On June 24, 2025, while driving approximately 1. 5 hours away from home, a warning message appeared on my dashboard stating: “hybrid system warning. Stop and do not drive. ” I immediately pulled over and contacted my insurance company, who arranged for the vehicle to be towed to the nearest authorized Hyundai dealership (thomas Hyundai in cumberland). The warning clearly indicated that it was not safe to continue driving. Later, I found out that the issue reported (recall 198) have presented cases ending with fire of the engine. It is critical to mention that in January 2025, I attended the official manufacturer recall for this vehicle, which was supposed to ensure safety and reliability. Despite this, the vehicle failed and left me stranded in an unsafe area. Since then, I have been without my vehicle for over three weeks. I contacted Hyundai customer care and opened a case. I was repeatedly told a case manager would call me within three business days, but I never received any follow-up until I insisted. I was eventually assigned a case manager named snowy, and also remained in contact with the dealership. On several occasions, both snowy and the dealership assured me that the vehicle would be ready by Thursday, July 10 and that it was not until then that I could start to request a reimbursement for my rental expenses. I repeatedly asked for confirmation because I am renting a car at my own expense in order to go to work and manage my life. However, on Thursday, July 10, I called again and was told the vehicle would instead be ready by Tuesday, July 15. Then, on Friday, July 11, I received an email stating that the engine had just arrived, and that the dealership was only now able to begin repairs. After that, and only once the car is finished, Hyundai will “review” the case and determine whether I qualify for reimbursement. This is unacceptable. I have been without a vehicle for over three weeks, forced to rent a car entirely at my own expense.

My car caught fire. The area where the stereo, heater, all melted even the windshield cracked and the gear shifter melted.

Complaint 11667442 vehicle: 2024 Hyundai Sonata mileage: 20,000 (approx. ). Update summary: this update concerns the persistent, severe electronic stability control (esc) steering malfunction previously reported. Current status of issue: the esc steering defect remains unresolved. The vehicle was taken to an authorized Hyundai dealership on July 15, 2025, for re-diagnosis. The technician reported being unable to find any fault, despite the clear, dangerous, and recurring symptoms of steering control loss and near-collisions. The vehicle is still unsafe to operate due to this unaddressed safety hazard. Manufacturer's response: during this recent service visit, Hyundai continued to refuse to provide a loaner vehicle for the diagnostic and repair period. This refusal places the driver at extreme risk due to the necessity of driving a vehicle with a known, uncorrected safety defect that has already failed a previous recall repair (performed June 6, 2025, ro 41686321 ). Impact: the vehicle's safety is severely compromised. The persistent esc defect, combined with the manufacturer's inability to diagnose/repair it and refusal to provide safe alternative transportation, necessitates immediate intervention.

On 05/27/2025, my rear back-up camera started to malfunction. Last week my dash started to malfunction electronically. When I would start my vehicle, all of the lights would start to turn on and stay on on my dash. My speedometer would not move while I was driving, so I could not see how fast I was going. I believe this is a severe safety issue for myself as well as others. The tachometer would jump up and down and would not function correctly. My dash stated that I had low tire pressure, that I was having problems with my traction control, that my bsd system was not working, that my abs was not working, that my emergency brake was on even though it was not. It also stated that I did have functioning air bags, which is a severe safety hazard in the chance that I could've gotten into a wreck and they might not have worked. It also stated that I was not in drive even though I clearly was. It also stated that I had no power steering while I was driving, before the light would turn off and I could properly steer again. This is a severe safety issue that could put me at risk. Finally, my check engine light turned on and stayed on. Yesterday on 06/09/2025 I was able to take it a vehicle maintenance shop so they could run a full diagnostic test. They discovered that I did not have power steering even though there was fluid due to the electrical problems with my dash. They also discovered the c-can buss was off and that my vehicle was losing communications with the tcm and hvac. It was discovered that this was due to my rear view back-up camera malfunctioning, causing the c-can network to short out. They had to unplug my rear back-up camera to return everything to normal. I have found on Hyundai recall forms that other years of Hyundai models had similar problems and I believe that 2018 Hyundai Sonatas are also having the same problem. I wanted it to be made aware because online, people have stated they are having the same issues. Attached gif that shows part of problem.

The engine light started to come on and go off and when I got the codes ran, it said something along the line of misfire. I had the spark plugs changed and I kept regular maintenance done on oil changes and tune ups. Now my engine is knocking and the vehicle is in limp mode.

Halogen headlight bubls h7 melting the casing socket. Making my headlight assembly smoke.