2014 Hyundai Sonata Powertrain & Transmission Problems

While driving with my family on a busy freeway at approximately 70 mph, our vehicle suddenly displayed a loud, urgent warning: “Hybrid System Warning – Safely Stop and Do Not Drive!” At the same moment, the car lost the ability to accelerate without any prior signs of trouble. We were extremely fortunate to have enough momentum to coast to the shoulder and shut the vehicle off, unsure of how serious the issue might be. Being stranded without warning on a high‑speed highway put my entire family in a dangerous situation. After a few minutes, we restarted the car to see if we could at least get it off the freeway. The warning had disappeared, and the vehicle drove normally, allowing us to take back roads home. The lack of any prior symptoms makes this even more concerning. Losing acceleration at highway speeds with no warning is a major safety hazard. We took the vehicle to a dealership immediately, but because the warning light was no longer active, they were unable to diagnose the problem. A few days later, the same warning appeared again—this time only a couple minutes from home. I turned around immediately for safety, parked the car, and once again the warning disappeared as soon as the vehicle was shut off. At this point, we have a car sitting in our driveway that we do not feel safe driving. The dealership cannot identify or repair the issue unless the warning is active, & even then, they cannot guarantee that a diagnostic code will appear. After researching this problem online, it’s clear that many other Hyundai owners are experiencing the same issue, often spending thousands of dollars without a definitive fix. Despite how common & dangerous this problem appears to be, there are no recalls & no consistent guidance from dealerships. This situation is unacceptable from a safety standpoint. A vehicle that can suddenly lose power at highway speeds—with no warning and no reliable way to diagnose the cause—poses a serious risk to EVERYONE and needs to be investigated

Vehicle's engine seized completely at 75 MPH on the interstate. No warning lights or abnormal noises were present before catastrophic failure, and the car has been serviced recently. CEL came on at time of failure, throws code P1326. Car rapidly/dangerously decelerated, would have crashed if not driving in the Leftmost lane of travel.

Dear Sir/Madam, I am writing to file a formal safety complaint regarding a dangerous incident involving my Hyundai Sonata Hybrid (VIN: [XXX] ) and Hyundai Motor America’s failure to fully correct the issue. Incident Summary: While driving on the freeway, the vehicle suddenly displayed the following alarming warnings: “Hybrid System Warning! Safely Stop and Do Not Drive” “Check Charging System” Immediately after these messages appeared, the car lost all power and shut down in the middle of the road. I had my two young children (ages XXX and XXX) in the car, making the situation extremely unsafe and traumatic. The vehicle lost all mobility and provided no opportunity to safely pull over. After contacting Hyundai Corporate multiple times, a case manager was eventually assigned to my case. At Hyundai’s request, I towed the vehicle to AutoNation Hyundai Valencia for diagnostic evaluation. The dealership diagnosed the issue as error code P0A78, indicating a transmission failure. Hyundai Corporate offered to cover 60% of the repair cost, leaving me responsible for the remaining 40%—an amount that exceeds the current value of the vehicle. This proposed resolution is not reasonable considering the severity of the safety risk and the vehicle’s low mileage. My primary concern is that this is an extremely dangerous defect, as the vehicle loses all power without warning, leaving the driver unable to move the car to a safe location. Requested Actions: A formal investigation into the safety and reliability of Hyundai’s hybrid systems, specifically in 2014 Sonata Hybrid vehicles. A determination of whether this defect qualifies under Hyundai’s warranty or federal safety defect regulations. Full compensation from Hyundai Corporate to cover 100% of the repair costs to correct this serious safety issue. Thank you for your time and attention to this critical matter. I look forward to your prompt response and appropriate action. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Formal Complaint – Hybrid System Failure, Safety Risk (VIN: [XXX] | Hyundai Case #[XXX]) Dear Sir/Madam, I am writing to file a formal safety complaint regarding a dangerous incident involving my Hyundai hybrid vehicle (VIN: [XXX] ) and Hyundai Motor America's failure to respond meaningfully to repeated requests for assistance. Incident Summary: On [XXX], while driving with my two young children (ages [XXX] and [XXX] ), my vehicle suddenly displayed the following critical warnings: “Hybrid System Warning! Safely Stop and Do Not Drive” “Check Charging System” Immediately after these messages appeared, the car lost all power and came to a complete stop in the middle of the road. This created an extremely hazardous and distressing situation for me and my family. Although the vehicle is a few years old, it has very low mileage (38,345 miles), and I did not expect such a catastrophic failure. I submitted a report to Hyundai Customer Support on May 30, 2025 (Case #[XXX]) and followed up on June 9, 2025, but have only received an automated acknowledgment—no response, investigation, or support to date. Attachments: A video clip showing the warning messages at the time of the incident (I cannot upload the video clip since the option is not there, but I do have it if required) Requested Actions: A formal investigation into the safety and reliability of Hyundai's hybrid systems. A determination as to whether this incident qualifies under Hyundai’s warranty or federal safety defect regulations. Immediate contact from Hyundai with the next steps regarding inspection, resolution, or compensation. I am cc’ing Hyundai Motor America to ensure this matter is escalated appropriately and receives the attention it warrants. Thank you for your time and consideration. I look forward to your timely response. Sincerely, [XXX] [XXX] [XXX] [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

When I was driving on highway check brake warning came up with hybrid system warning I wasn’t be able to stop or accelerate I slowed down and pulled over might caused a big accident.

I was driving at a higher rate of speed 50 MPH in the center of 3 laned road no warning or indicator lights were on in my vehicle when the engine without warning blew and stopped working. Again no check engine lights were on no warnings were given. It shut down and would no longer accelerate or drive. We almost caused several accidents as this was a very busy roadway.

Lost power to vehicle while driving on the freeway, hybrid system warning was displayed as well as several lights to include engine, brake, and skid control. Had the dealer replace the knock sensor, 3 months later the exact same thing happened, in the same way. All the same obd2 codes were pulled both times.

Incident date 07/04/2023 Incident place I-405 exit WA-522 Incident total engine, car system completely off, brakes won't work Traveling with whole family complete car system failure, had to drive to side road hitting bushes and trees in order to get the car stopped State patrol arrived at the scene, assisted getting towing Everything turned off while on freeway to direction to the two/three lane bridge had to quickly take any exit in order to avoid the freeway bridge I repeat again Total Engine & System failure, Brakes won't work at all while system is dead

The car used up to 4 quarts of oil per week with just driving when necessary. It burned oil and blew it out under the hood.

I bought my car at 97k miles in June 2022. From the 2nd day of having it, my car was shaking horribly. I sent it back to the dealership they said the front motor mount was collapsed. They repaired it but said there is still shaking but they don't know why. About 2 months later, I get in with Universal Hyundai and they only say that I need my axels and spark plugs replaced along with the air filters. They do a balance and alignment on my car as well as an oil change. The balance and alignment was either not done properly or my car just needs it done super regularly. Not too long after while I'm driving out of a friend's neighborhood my car is in drive and I'm going around 5 mph, my car stops with all of the lights on. I turn my car off and back on and carefully drive it home. Also, my car key always gets locked up in the ignition. One day I go to turn my car off and my ignition locks and I had to get my car towed and my ignition replaced with new car keys. Later, I take it to my mechanic to see what he can do and to get another oil change. He said he doesn't think it's my axels but my motor mounts and other things. Then my check engine light goes off a week later and it's my power train and anti-lock brake system. The next day on the way back to the mechanic my car slows down, I was only going 40ish mph, and all of the lights are shown. I turn my car off and on and I get it to my mechanic (my mechanic only down minor stuff btw). I start hearing a woodpecker noise from the engine and my mechanic tells me to get it to the shop asap. The next morning, I call my warranty to see if it's covered and they tell me that my engine will blow if I drive on it. And now my car will be in the shop for a month. And I can't find out the service done to my car prior to me owning it. And every time I take it somewhere they don't know what's up with it completely.

I am the owner of a 2014 Hyundai Sonata. That car is 8 years old and has 69K miles on it. At no time did Hyundai Motor Company notify that my car was impacted by an engine failure recall. On November 10, 2022 the car was being driven. At no time did it give any potential warning, instead the car fully stopped while in motion at 25 mph. There was no warning, no lights appeared on the dashboard until the car had stalled itself out. When I called the local dealer where the car was purchased, I was promised a call back. That call never came. I was able to contact someone at corporate who did confirm the vin number of my car is on an engine recall. I was told to contact a local dealer to find someone to replace the recall alerts. Again the local SURESKY dealer cannot help me. After spending 4 hours on the phone, I was able to connect with someone in a service department who indicated that the return volume of these car is so extensive that they are backlogged 3 to 4 more. I would encourage all users of this car to immediately end use of it. I would encourage all users to look into local LEMON laws. This entire recall was handled completely wrong by Hyundai Corporate who. Nobody can answer questions, they can only pass you around. The company should be investigated for consumer fraud at the state and federal level. The company should be investigated for proper accounting, proper tax reporting, for the recall.

I was driving down the road in my 2014 Hyundai Sonata Limited 2.0T, in the car with me was my two young children ages 1 & 2. We were driving normally when the car all of a sudden shut off and died in the middle of the road while ongoing traffic behind me. I was able to come to a safe stop and crank the car back up and move to the side of the road. When I cranked the car back up it began knocking and the engine shaking. I immediately turned the car off and got my children out of the vehicle and we waited for my fiancé and a tow truck. Car has always had oil changes on time in the three years I owned it. Only had 125k miles. Oil was changed 1 week and a half prior to this incident. I only ran it 567 miles before my engine stalled. Thankful I was not rear ended with my babies in the back seat.

Car is leaking excessive oil all through the engine and other main components. Theta engines are faulty and leading to engine staling and then failure. My engine stalled once. Was throwing no dash lights or codes. Next time the car was cranked it started knocking, still not throwing any dash lights. Brought to Hyundai dealership. The manufacturer is refusing to fix the engine saying it was ran on to low on oil to often. I had my records of maintenance to prove other wise once I provided them Hyundai said no still then said no because they took pictures of the inside and it looks as if it was running low on oil. This engine seizing can result in fire and major safety hazards including death and Hyundai is taking no accountability.

i was coming around a bent and accelerated down a straightaway when the car shutdown and all dash lights came on. I had to quickly find a spot to pull over as I was losing momentum and it was hard to brake. I pulled on to the front yard of a residence as there was no road shoulder. The car was smoking and there was a distinct smell coming from it. Some of the car was still out over the road so traffic had to avoid it. There weren't streetlights and it was foggy at night. I used the emergency flashers. There was no warning before the problem took place as far as engine light or warning lights being on. I had the car towed. It is currently at a dealership. Dealership determined engine seizure after diagnosis.

The contact owns a 2014 Hyundai Sonata. The contact received a recall notification for NHTSA Campaign Number: 20V121000 (FUEL SYSTEM, GASOLINE), however, the Ford dealer he purchased the vehicle from informed him that she would need to contact a Hyundai dealer to schedule a recall repair appointment. The contact stated while his wife was parking the vehicle in the driveway, the gas pedal was not depressed however the vehicle accelerated on its own and crashed into the garage door. There were no warning lights illuminated. The contact sustained injuries on the right knee but did not seek medical assistance. The vehicle was not diagnosed nor repaired by an independent mechanic or dealer. The dealer and the manufacturer were not notified of the failure. The approximate failure mileage was 55,000.

WHILE DRIVING THE CAR STARTED REVVING,NO POWER,THE CAR WAS STUCK IN FOURTH GEAR, HAD TO TURN CAR OFF,FOR IT TO RUN NORMALLY,BUT IT KEEPS HAPPENING.

TL* THE CONTACT OWNS A 2014 HYUNDAI SONATA. THE CONTACT STATED THAT WHILE THE TRANSMISSION SHIFT SELECTOR WAS IN THE PARK POSITION, THE VEHICLE ROLLED BACKWARDS. THE VEHICLE WAS TAKEN TO THE LOCAL MECHANIC WHO DIAGNOSED THAT THE TRANSMISSION SHIFT CABLE HAD FAILED AND NEEDED TO BE REPLACED. THE VEHICLE WAS NOT REPAIRED. THE LOCAL DEALER AND MANUFACTURER WERE NOT CONTACTED. THE CONTACT WAS INFORMED THAT THE VEHICLE WAS NOT INCLUDED IN THE NHTSA CAMPAIGN NUMBER: 14V434000 (POWER TRAIN). THE CONTACT STATED THAT THE VEHICLE EXPERIENCED THE FAILURE LISTED IN THE RECALL. THE FAILURE MILEAGE WAS 120,000.*DT*DT*JB*JB*DT

"CHECK CHARGING SYSTEM" WARNING MESSAGE CAME ON WHILE DRIVING ON THE HIGHWAY AT NIGHT 01/08/2021. SUDDENLY NO POWER TO THE ENGINE. THE GAS PEDAL WASN'T WORKING. QUICKLY I PULL INTO THE HARD SHOULDER. THE CAR FAILED TO START THE ENGINE WITH THE SAME ERROR MESSAGE. THE CAR LOST POWER SHORTLY AFTER. (THE HAZARD LIGHT WASN'T WORKING. I CONTACTED 911 FOR EMERGENCY ASSISTANCE. PENNDOT TRUCK SHOWS UP AFTER AN HOUR TO COVER THE ROAD. ( TO PREVENT COLLISIONS.) I TOWED THE CAR TO A NEARBY DEALER. CONTACTED BY THE DEALER 3 DAYS LATER. THEY SAID IT WAS12V A BATTERY ISSUE AND IT'S FIXED. I WENT BACK TO THE DEALER THE NEXT DAY TO PICK UP THE CAR. I PAID $388 FOR REPLACING THE BATTERY. THE CAR WON'T START WITH THE SAME ERROR MESSAGE. I RAN INTO THE DEALER ASKED FOR AN EXPLANATION. THE WORSE THING IS THE DEALER NEVER RAN THE DIAGNOSTIC TEST FOR CODE OR ANYTHING AND ASSUMED IT'S FIXED. I DEMANDED A REFUND. I MADE A FEW CALLS TO CHECK THE STATUS OF SERVICE SINCE THEN. NO ONE HAS RETURNED MY CALL YET.

THERE HAVE BEEN PREVIOUS RECALLS FOR HYUNDAI VEHICLES REGARDING THE NEUTRAL SAFETY SWITCH/TRANSMISSION RANGE INHIBITOR FAILING TO WORK PROPERLY, BUT IT APPEARS THAT THIS PROBLEM EXTENDS TO VEHICLES OUTSIDE OF THE PREVIOUS RECALL WINDOW. THE 2014 HYUNDAI SONATA SE EXPERIENCES A SIMILAR DEFECT, AS SEARCHES ONLINE WILL INDICATE A HIGH NUMBER OF FORUM POSTS AND OTHER RESOURCES WHERE DRIVERS OUTLINE THEIR CONCERNS. SPECIFICALLY, ON AN INTERMITTENT BASIS, THE CAR WILL FAIL TO DISPLAY A GEAR WHEN STARTING, SHOWING A BLANK SYMBOL ON THE DASH AND NOT ILLUMINATING THE GEAR SHIFT COLUMN. THIS LEAVES THE CAR UNABLE TO BE SHIFTED INTO ANY GEAR. IT APPEARS THAT A WIDE RANGE OF HYUNDAI VEHICLES HAVE BEEN EFFECTED BY FAULTY NEUTRAL SAFETY SWITCHES, AND AS I MENTIONED SOME VEHICLE YEARS NEED TO BE RECALLED THAT WERE NOT PREVIOUSLY DONE SO IN THE LAST 'BATCH' OF RECALLS FOR THE SIMILAR ISSUE.

THE CHECK ENGINE LIGHT ILLUMINATED INTERMITTENTLY AT 92K MILES, THEN THE ENGINE STARTED MAKING NOISES INTERMITTENTLY, AND THEN THE VEHICLE WAS SLOW TO ACCELERATE INTERMITTENTLY. THE KNOCK SENSOR SOFTWARE UPGRADE HAD PREVIOUSLY BEEN INSTALLED. THE SYNTHETIC OIL HAD BEEN CHANGED AT 82K AND 86K. SOUTH POINT HYUNDAI CHANGED THE OIL, REPLACED THE BATTERY AND TURBOCHARGER AT 92381 MILES. AROUND 93246 MILES THE INTERMITTENT ENGINE NOISES AND INTERMITTENT NO ACCELERATION AND SLOW ACCELERATION ARE BACK, AND THE CHECK ENGINE LIGHT IS NOT ILLUMINATING. RETURNED MY SONATA TO SOUTH POINT HYUNDAI WHO REPORTS THE ENGINE IS BAD, BUT THERE ARE NO DIAGNOSTIC ERROR CODES, AND THEY ARE WAITING TO HEAR BACK FROM HYUNDAI ON HOW TO PROCEED. HENCE, THE KNOCK SENSOR SOFTWARE UPDATE IS NOT A CORRECTIVE ACTION FOR DETECTING ENGINE FAILURE, ALERTING DRIVERS TO ENGINE FAILURE. THE KNOCK SENSOR SOFTWARE UPDATE IS NOT AN EFFECTIVE SCREEN FOR ENGINE DEFECTS. THE ENGINE NOISES OCCUR WHEN THE VEHICLE IS STATIONARY, IN MOTION, ON A CITY STREET, AND ON A HIGHWAY.