2014 Hyundai Sonata engine problems

ENGINE

The vehicle suffered an abrupt, internal engine seizure while operating in active traffic at highway speeds. This sudden loss of power created an immediate crash hazard, as the vehicle decelerated rapidly in the travel lane, narrowly avoiding a rear-end collision and putting my family and other motorists at extreme risk. The vehicle was towed immediately to an authorized Hyundai dealership service center where it is currently awaiting the physical recall inspection. Prior to the complete engine failure, there were no warning lights, abnormal gauge readings, dashboard messages, or noticeable performance symptoms. The engine seized completely without warning. The vehicle has an open, uncompleted Federal Safety Recall 162 (NHTSA Campaign Number: 16V729000) for this exact engine manufacturing defect and bearing failure.

NHTSA complaint #11758160 — an unverified report by a vehicle owner.

ENGINE

The check engine lights blinking, it overheats and it shuts down.

NHTSA complaint #11749925 — an unverified report by a vehicle owner.

ENGINE

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.

NHTSA complaint #11747161 — an unverified report by a vehicle owner.

ENGINE

Updated NHTSA Complaint DraftVehicle Information: 2014 Hyundai SonataVIN: [XXX] Incident Date: XXX Description of Safety Defect:While driving on XXX, the vehicle's engine experienced a catastrophic mechanical failure and completely shut off without warning, causing an immediate loss of motive power. This sudden engine stall created an extreme, hazardous traffic safety risk.A subsequent professional inspection revealed that the vehicle's odometer had been illegally rolled back and tampered with by the selling dealership (Johny's Auto Center in 120 bleu hill ave Roxbury, MA) 02119 prior to purchase. The true, undocumented mileage of the engine is significantly higher than indicated, directly causing this sudden component failure. I am reporting this incident both as a critical vehicle safety defect and as a case of illegal odometer fraud. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA complaint #11747015 — an unverified report by a vehicle owner.

ENGINE

I am submitting this complaint regarding a serious safety issue involving my Hyundai Sonata. While driving under normal conditions, my vehicle suddenly entered a low-power ("limp") mode without warning. The vehicle would not accelerate beyond approximately 30–35 mph, creating a potentially hazardous situation in traffic. At the same time, the check engine light began blinking. The sudden loss of power significantly reduced my ability to maintain traffic speed and safely maneuver the vehicle. This condition could have increased the risk of a rear-end collision or other accident. I brought the vehicle to an authorized Hyundai dealership (Fred Beans Honda Of Abington PH# 215-392-9020) for diagnosis. The dealership confirmed that the vehicle stored Diagnostic Trouble Code (DTC) P1326, related to the Knock Sensor Detection System (KSDS). According to the dealership, the vehicle entered limp mode as a result of this fault. The abrupt reduction in vehicle power and speed occurred without sufficient warning and created a safety concern. I am reporting this incident so that NHTSA can investigate whether this condition represents a broader safety defect affecting Hyundai Sonata vehicles equipped with the KSDS system. Vehicle Information: Make: Hyundai Model: Sonata Model Year: 2014 I request that NHTSA review this issue and evaluate whether additional action is warranted regarding vehicles experiencing DTC P1326 and associated limp-mode operation.

NHTSA complaint #11741142 — an unverified report by a vehicle owner.

ENGINE

Vehicle Information: Year/Make/Model: 2014 Hyundai Sonata Mileage: less than 120,000 miles Ownership: Second owner Complaint: I am filing a complaint regarding a serious engine failure in my 2014 Hyundai Sonata. My vehicle experienced issues beginning with a faulty knock sensor, which escalated into complete engine failure. This issue appears to be identical to problems that have already been identified in recalls involving similar Hyundai Sonata models. Despite experiencing the same symptoms and failure pattern, my specific VIN is not included in the recall. My vehicle has been well maintained, has under 120,000 miles, and should not have experienced a total engine failure under normal conditions. Based on the known recall issues related to engine defects and knock sensor failures, I believe my vehicle is affected by the same underlying defect. I am concerned that vehicles like mine are being excluded from the recall despite having identical safety-related issues. Engine failure while driving presents a serious safety risk, including potential loss of power, stalling, or inability to accelerate in traffic. I have had the car looked by a professional and advised of the engine failure and this is a common issue with this make and model.

NHTSA complaint #11735760 — an unverified report by a vehicle owner.

ENGINE AND ENGINE COOLING

The contact owns a 2014 Hyundai Sonata. The contact stated that the vehicle failed to start. The vehicle was towed to the residence and was started. The contact stated that the failure was intermittent. The contact stated that while driving at an undisclosed speed, the vehicle stalled. The check engine warning light was illuminated. The vehicle was taken to an independent mechanic, where it was diagnosed with turbo charger failure. The contact was informed that the turbo charger needed to be replaced. The vehicle was not repaired due to the cost. The manufacturer was not contacted. The failure mileage was unknown.

NHTSA complaint #11727565 — an unverified report by a vehicle owner.

ENGINE

I had gotten an engine back in 2021 because of a recall, and now the newer engine is burning all my oil up.

NHTSA complaint #11722578 — an unverified report by a vehicle owner.

ENGINE

I had recall 162 - engine replacement completed in 2024 , now I have fuel leak at high pressure fuel pump, the pump that is a component of the engine has now failed which was installed during the engine replacement which can cause a major fire

NHTSA complaint #11713805 — an unverified report by a vehicle owner.

ENGINE

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

NHTSA complaint #11711362 — an unverified report by a vehicle owner.

ENGINE

The engine failed in my 2014 Hyundai Sonata for the 2nd time while driving in evening traffic on a major interstate with my elderly father in the car with me. The engine completely shut down while in mid drive on the interstate with no power. The engine and oil lamp indicators immediately came on right before the engine lost power on the interstate. This caused my safety and the safety of my father to be put at risk by not being able to have any power while in the lane of evening traffic. My vehicle was towed to the nearby Hyundai dealership, Modern Hyundai of Concord, where their service department conducted inspection of the engine issue and where it was kept for 4 months with no repairs made per the orders of Hyundai Motor America. Hyundai Motor America refused to honor their own warranty to replace the engine (engine in need of replacement for the 2nd time).

NHTSA complaint #11710169 — an unverified report by a vehicle owner.

ENGINE

The vehicle experienced a sudden engine failure and loss of power while traveling at freeway speed. Two days earlier, the vehicle had been taken to an authorized dealership for factory recall service. During that visit, concerns were raised about known engine issues associated with this model, but the vehicle was returned to service. While driving on the freeway, the engine abruptly stalled without warning, causing immediate loss of propulsion and power. This created a dangerous situation in moving traffic, requiring rapid maneuvering to avoid a collision and safely exit traffic lanes. The vehicle became inoperable and could not be restarted. The failed component appears to be the engine or related internal engine system. The vehicle was towed back to the dealership following the incident and has remained inoperable since that time. The vehicle is currently available for inspection. The failure placed the driver at significant risk due to the sudden loss of power at highway speed. No collision occurred, but the risk of serious injury or death was present. The problem has not been reproduced because the vehicle has remained disabled since the incident. The dealership and manufacturer have inspected the vehicle after the failure. The manufacturer is reviewing the incident under an internal process. There were no prior warning lights, messages, or symptoms indicating imminent engine failure before the stall. The failure occurred suddenly and without advance notice.

NHTSA complaint #11705440 — an unverified report by a vehicle owner.

ENGINE

My 2014 Hyundai Sonata experienced a P1326 engine fault code, which activates the knock sensor system due to engine bearing wear. This condition is directly related to Hyundai’s safety recall 17V226 (Theta II engine). The Hyundai dealership submitted my case to Hyundai corporate, and Hyundai denied the repair solely because my vehicle has over 150,000 miles. A manufacturer cannot refuse a federal recall repair due to mileage, and Hyundai’s engine recall has no mileage or time limit. The denial places me in an unsafe situation, as the recall defect can cause engine seizure or stalling while driving. I am requesting NHTSA intervention.

NHTSA complaint #11703395 — an unverified report by a vehicle owner.

ENGINE

This motor had a recall. Campaign t3g- sonata yfa 2.4L Theta II. 1 month after an oil change at the mechanic the car started making noises. Took it right to the mechanic who said there was no oil and that there was a recall on this motor for this reason. Immediately took it to the Hyundai dealership located in centereach NY. The employee who helped us was not a help. Took days and days to even get the paperwork In for the recall. Did not communicate with us unless we called him. Then eventually just said it was denied. Took weeks to get the proof from them. Completely frustrating. We submitted all proof of oil changes and maintenance and it was denied saying engine neglect! We are struggling to keep up with bills and now cannot get to work because of this. We have 2 toddlers and he is a volunteer firefighter and EMT in Centereach. He works full time at Stony Brook Hospital and is in school full time with rotations in the hospital for paramedic class. This is insane to be treated this way

NHTSA complaint #11696703 — an unverified report by a vehicle owner.

ENGINE

CAR MAKING LOUD NOISE UNDER THE CAR HOOD LIKE SOMETHING FALLING APART UNDER THE HOOD, A MECHANIC TOLD ME THAT IT WAS THE ENGINE , I WAS ALSO TOLD THAT THERE WAS A RECALL ON THIS CAR ENGINE. HYUNDAI DID MY 90,000 MILE INSPECTION ON JULY 19, 2025, AT THE TIME THE WORK WAS DONE I ONLY HAD 87238.

NHTSA complaint #11693448 — an unverified report by a vehicle owner.

ENGINE

Hello, I brought my 2014 Hyundai Sonata (approx. 73,000 miles) to an authorized Hyundai dealership (MotorWorld Hyundai, Wilkes-Barre, PA) on August 4, 2025, for Recall 162 (NHTSA 17V-226) due to audible engine knocking. I reported the noise when dropping off the vehicle. The dealer claimed the engine passed the inspection but did not provide any documentation confirming that the required bearing test was performed. They said the issue might be from the top of the engine (possibly the timing chain) and wanted to charge $800 to disassemble the engine, with a repair estimate of $2,900. The reason they wanted to disassemble the engine is because after an initial diagnosis for $160 they discovered the noise is not from the timing chain. Besides, it would be extremely unusual for the issue to be a timing chain at 73k. I later learned from Hyundai Customer Care that the recall still shows as “Incomplete” in their system, meaning the inspection was never properly submitted. I'm conerned that the recall was not properly performed or submitted (why does it still show "incomplete" if they insepcted it and it passed?) and that the symptoms may still indicate the exact defect covered under Recall 162 (rod bearing knock), I believe I was denied proper remedy (in a less polite way - I think they flat out lied to me about the real issue) and I was pressured toward expensive non-recall repairs without conclusive diagnosis. My understanding is that getting a diagnosis for a timing chain shouldn't cost anywhere near $800. I am requesting NHTSA review this situation to ensure Hyundai fulfills its federally mandated recall obligation. Thank you, [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA complaint #11685750 — an unverified report by a vehicle owner.

ENGINE

My engine has a knock and the dealership told me that they would not fix it due to "lack of maintanence" but I tried explaining to them that I was unable to get proof because Oreily and auto zone were unable to get me receipts on old purchases.

NHTSA complaint #11682737 — an unverified report by a vehicle owner.

ENGINE

Engine Failure. After taking my Hyundai listed above in for repairs to the air conditioning not working properly and while in custody of Jeff's Automotive Service, here in Sterling, IL 61081, the engine suddenly died out while they were test driving the car. They were able to jump start it once, and then it died out again while driving it. This time the car could not be restarted by all means possible. Being in the shop, other possible causes were checked and not one of them worked. The Engine is completely DEAD. After Checking for possible causes online it was found that a recall for the very same Engine Failure had been done back in 2017/2018.\n" + 'For unknown reasons, I was never notified nor did I ever received such notice. Now at this time, we have contacted a local dealer and they state that because the auto had not been taken in for the recall repairs, it no longer "qualifies" for free repairs and any repairs would have to be paid for. Upon checking the NHTSA website, it states that there are no time limits on the repairs. I was going to contact National Hyundai Corp to inquire about it, but decided instead to file a complaint with you. 'The question is: Is my car still eligible for the Recall Repairs under the Hyndai Mfg Recall #162 'of March 31, 2017? Recall Number 17V2260000??? Given the fact that i did not receive their notification if indeed, one was sent, and I was totally unaware of this Recall???. I sincerely\n' + 'believe that under the laws and procedures, I should still be eligible for this Recall Repair of\n' + 'their Faulty Engine Failure in my automobile listed above. \n' + 'Therefore I am at this time requesting an investigation and a decision before I make any attempts to contact Hyundai Mfg directly. Also as part of my inquiries I spoke to the Service Department of Schimmer Hyundai in Peru, IL the closest dealer to me, and after checking the VIN number I was to

NHTSA complaint #11682308 — an unverified report by a vehicle owner.

ENGINE AND ENGINE COOLING

The contact owns a 2014 Hyundai Sonata. The contact stated that the vehicle was inspected by a mechanic, and during the test drive, the vehicle experienced a loss of automotive power. There was no warning light illuminated. The local dealer was contacted; however, the vehicle was not diagnosed or repaired. The contact referenced NHTSA Campaign Number: 17V226000 (ENGINE AND ENGINE COOLING) as a possible cause for the failure. The manufacturer was notified of the failure. The approximate failure mileage was 68,000.

NHTSA complaint #11682253 — an unverified report by a vehicle owner.

ENGINE

The vehicle experienced engine stalling and rough running. We discovered it had an open engine recall related to known defects in the Theta II engine. We dropped the vehicle off at a Hyundai dealership (Hyundai Napleton) on July 1st, 2025 for recall repair, following instructions from ACV Auctions. After holding the vehicle for over three weeks, Hyundai Napleton informed us they could not perform the recall due to their internal policy against working on dealer-owned vehicles. This directly contradicts the purpose of a federally mandated safety recall, which is supposed to apply regardless of ownership. On July 23, 2025, we received a call from Hyundai Motor America, stating they would not approve the recall repair because the vehicle had been declared a total loss. This is entirely false—the vehicle has never been declared a total loss by any insurance company or official source. It appears Hyundai Motor America and the dealership are passing responsibility back and forth, providing conflicting and inaccurate information, while the vehicle sits unrepaired and inoperable. This behavior delays a federally mandated repair, puts consumers at risk, and reflects serious breakdowns in how Hyundai handles recall compliance. We need NHTSA’s help to investigate and enforce the proper handling of this safety recall. Vehicle VIN: [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA complaint #11677599 — an unverified report by a vehicle owner.

ENGINE AND ENGINE COOLING

The contact owns a 2014 Hyundai Sonata. The contact stated that while driving at an undisclosed speed, the check engine warning light illuminated. The vehicle was taken to the dealer, who diagnosed a failure with the connecting rod bearings, resulting in damages to the engine. The vehicle was not repaired. After investigating the failure, the contact related the failure to NHTSA Campaign Number: 17V226000 (Engine and Engine Cooling); but the VIN was not included. The manufacturer was notified of the failure, a case was opened for repair assistance. The contact was later informed that the assistance request was denied on the grounds of poor maintenance history. The contact stated was not the owner of the vehicle during the time cited by the manufacturer. The failure mileage was 136,000.

NHTSA complaint #11676727 — an unverified report by a vehicle owner.

ENGINE

My engine seized and I lost power. This is the second engine this has happened to. I was given a extended warranty, but Hyundai is refusing to pay for a new engine. The mechanic advised me they are replacing engines three times a week. Mine was denied even though my engine only has 76,000 miles and my warranty is still good. This engine problem should be a new recall since the same problem is still occurring. The engine light did come on blinking. When I took it to the dealer. They knew the problem before looking at my engine since so many others need to have thiers replaced. The dealership confirmed i need a new engine. They made me send in my oil changes. They were upset I didn't have any oil receipts for my previous engine even thought it was replaced at a Hyundai dealership the first time. Consumers should not have to replace two engines. This is a safety concern with it losing power so quickly.

NHTSA complaint #11672363 — an unverified report by a vehicle owner.

ENGINE

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

NHTSA complaint #11671502 — an unverified report by a vehicle owner.

ENGINE

When I was trying to accelerate, my gas pedal just wasn't responding at all and the engine, oil, and battery light all came on. When that happened my car shut down and I coasted to a stop.

NHTSA complaint #11661719 — an unverified report by a vehicle owner.

ENGINE

While driving my 2014 Hyundai Sonata on [XXX], the engine suddenly stalled without warning. I was in motion on a public road when the vehicle lost power, forcing me to safely pull over. There were no warning lights, check engine lights, or prior signs of engine trouble before the failure occurred. I had the vehicle towed to a certified Hyundai dealership (Norm Reeves Hyundai Superstore in Cerritos), where I was told the engine failed due to rod bearing failure caused by oil starvation. The dealership stated that the engine needed to be replaced. However, I have maintained the vehicle regularly, with consistent oil changes and maintenance, and I have documentation to prove this. Despite this, Hyundai has refused assistance and claims "exceptional maintenance neglect" without showing inspection photos or detailed evidence. This engine failure fits the exact pattern of a known engine defect already under recall for similar Hyundai models and engines, including issues with oil passages and rod bearings that lead to sudden engine failure. These vehicles have been involved in class-action lawsuits and recall campaigns for this reason. This sudden failure put my safety and that of others at risk, as the engine lost power in traffic without any prior warning. I am requesting NHTSA investigate whether this issue is part of the broader defect already under recall, and whether Hyundai is avoiding responsibility by misclassifying valid cases. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA complaint #11659621 — an unverified report by a vehicle owner.

ENGINE

While driving on the highway, the engine of my 2014 Hyundai Sonata suddenly seized without any prior warning. There were no preceding symptoms such as warning lights, unusual noises, or performance issues that might have indicated an impending failure. At the time of the engine seizure, I also lost power steering and power brakes, which severely compromised my ability to control the vehicle and led to a dangerous situation in fast-moving traffic. I later discovered that vehicles equipped with the Theta II engine have experienced similar issues, suggesting a potential safety-related defect. I am reporting this incident as a serious safety concern and request that NHTSA investigate this matter further.

NHTSA complaint #11658788 — an unverified report by a vehicle owner.

ENGINE

Car transmission replaced with only 38,000 miles. Car shutters, skip gears, loss of power. Very dangerous especially when pulling out from side road on to main road. Transmission problem starts out as intermittent at first, so you never know when it will happen next. Lots of near misses where I would have been rear ended, due to shifting problems. New Transmission is already starting to shift erratically at times with only 2,000 miles on new rebuilt trans. Cost of repair is 5 to 6,000. Also own 2012 Hyundai Sonata Hybrid with the same exact transmission problems. Transmission replaced at 67,000 and now at repair shop for replacement Trans at 124,000 miles. Vin [XXX] . Both of these cars are dangerous to drive. These problems start out intermittently, and if the dealership cannot duplicate the problem, they will not fix anything, hoping to string you along past the warranty period. I tell them to check the fault code history and they tell me that they did not find any error codes. Both these cars also have the defective engine too- but so far my engines are working correctly. Invoices can be provided if needed. Found research shows that there are transmission problems with almost all generations of the Sonata's especially my 2 years - 2012 and 2014. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA complaint #11657892 — an unverified report by a vehicle owner.

ENGINE

Misfiring cylinder

NHTSA complaint #11652569 — an unverified report by a vehicle owner.

ENGINE

Just purchased the sedan and took it to a shop to get checked Reason for the doing was because vehicle felt a lil rough after getting the vehicle checked they came to the conclusion that the motor had seized

NHTSA complaint #11651934 — an unverified report by a vehicle owner.