Hyundai Sonata Plug-in 2016 — Reported problems

The contact owns a 2016 Hyundai Sonata. The contact stated that while driving 70 MPH, the vehicle went into LIMP Mode and decelerated. The check engine warning light and the battery warning light were illuminated. The failure was a recurring failure. The vehicle was towed to the first dealer, and the contact was informed that an oil change was needed. The failure persisted, and the vehicle was taken to another dealer and was diagnosed and DTC: C222908; was retrieved. The manufacturer was contacted by phone and made aware of the failure. The failure mileage was approximately 88,385.

The contact owns a 2016 Hyundai Sonata. While the contact's daughter was driving 55 MPH, the engine seized. The contact stated that the failure had occurred while the contact's two minor grandchildren were inside the vehicle during the failure. The vehicle was towed to an independent mechanic. The vehicle was later towed to the dealer where it was diagnosed with engine failure. The contact was informed that the engine needed to be replaced. The manufacturer was contacted, and a case was filed. The contact was informed about the eligibility for the extended warranty under Campaign 953. The contact was informed that the repair was not covered under the extended warranty because the Campaign 953 was not completed. The failure mileage was approximately 60,436.

While driving on the freeway, the check engine light started flashing and the gas pedal became useless. This put the driver and the passenger of the car in massive danger as they could no longer accelerate on the freeway. Luckily, they were able to get off the freeway without causing an accident. Upon reading the code at an auto shop, they discovered that it was P1326 or a knock sensor issue. This malfunction caused the car to go into limp mode and put the passengers in serious danger. Several calls to the Hyundai Service Center were made yesterday (Saturday, October 3rd). However, not one was ever answered. They hope to be able to get the car to the dealership's service center as soon as possible, but the earliest appointment online is multiple weeks away. This same car was recently at the dealership service center for an internal engine oil consumption problem and thoroughly inspected. The car is up to date on all software and recalls. Even though a valve cover replacement fixed the oil consumption issue, the owners are now having even worse issues. This is the only car for a married couple who are both working and going to college full-time. This issue has been a severe complication to their scheduling, and they were put in harm's way on the freeway.

Backup vision system failed. Couldn't see vision because screen was blank. Radio didn't work either. Went to dealership with the problem they said it was not covered by the warranty. Paid to have it fixed.

The vehicle experienced a Theta II engine failure at under 57,830 miles while driving on northbound [XXX] near the [XXX] Parkway U-turn in [XXX]. The engine made a loud noise and lost power. I was able to coast to the far right side of the U-turn under the bridge. I called HERO (Austin's emergency roadside assistance). They responded, determined it was not a battery issue, and pushed the vehicle to the Southern Leisure Spa parking lot on the southbound side of the road. The vehicle was then towed. The vehicle is equipped with the KSDS (Knock Sensor Detection System) software update, installed as part of Hyundai's remedy for this known defect. Despite KSDS being installed, the engine failed due to connecting rod bearing wear, consistent with the documented Theta II defect. A Hyundai dealership confirmed KSDS was installed but denied the warranty claim, citing maintenance records. The vehicle is available for inspection upon request. The Theta II engine defect has been the subject of prior NHTSA investigations and Hyundai recalls. This complaint is filed to document another failure of the same defect in a vehicle with the manufacturer's remedy installed. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

I am concerned that the engine may seize or stall without warning while driving, creating a risk of crash, injury, or death. The Theta II engine defect is known to cause engine seizure, stalling, and fire. Hyundai has denied warranty coverage based on mileage and second-owner status — both of which are explicitly prohibited as denial grounds under the Settlement — leaving me driving an unsafe vehicle.

Vehicle Impact:While driving, the vehicle suddenly displayed a "Check Hybrid System" warning on the dashboard and suffered a complete, sudden loss of propulsion while on the road. The vehicle dropped power completely and would not restart, creating an immediate, severe safety hazard to myself and surrounding traffic.Diagnostic & Component Confirmation:The vehicle was towed to a certified Hyundai dealership (Hyundai of Goshen, Repair Order #6080674). Diagnostic testing confirmed trouble codes P0717 (Input Speed Sensor No Signal) and P0A40 (Drive Motor Position Sensor).The dealership's certified technician explicitly documented that they "followed TSB and found input speed sensor valve body harness is faulty due to heavy corrosion on the sensor connector."Safety Hazard Summary:This is a critical manufacturing and sealing defect where an internal, non-wear component (the transmission valve body wire harness) corrodes prematurely. This corrosion blinds the hybrid control modules to the electric motor's position and output speed. To protect itself, the computer initiates a hard, uncommanded shutdown of the hybrid drivetrain while the vehicle is in motion.Hyundai Motor America was contacted (Case #43225229) but denied any financial or safety assistance because this documented Technical Service Bulletin (TSB) defect has not yet been elevated to a formal safety recall. This sudden powertrain failure presents an unreasonable risk of rear-end collisions and catastrophic highway accidents for 2016 Sonata Hybrid owners.

The car died while going 70 on a highway with no warning signs. The car completely shut off and will not turn over or move at all.

Component & Inspection: Vehicle engine suffered connecting rod bearing failure and entered restricted P1326 "Limp Home Mode" (max 2,000 RPM). The vehicle is grounded and available for inspection at Bud Clary Hyundai in [XXX].Safety Risk: Sudden, unexpected loss of power occurred while driving, placing me and other drivers at immediate risk on public roads due to the vehicle's inability to maintain normal traffic speed or safely accelerate.Dealer & Corporate Confirmation: Active P1326 engine code is confirmed. Car has been held for 14 days. The franchise is violating federal settlement rules by explicitly refusing to execute the mandatory, free mechanical Bearing Clearance Test (BCT) unless I pay out-of-pocket fees.Inspection & Corporate Compliance Failure: Car was brought to the dealer on XXX. The service manager admitted in writing that they are withholding safety diagnostics to protect shop labor hours due to an automated computer flag regarding a clerical title brand discrepancy. Hyundai Corporate is actively enabling this violation; my case manager refuses to issue a manual compliance override for the safety test and is violating federal settlement terms by withholding my contractually mandated alternative transportation.Warning Lamps & Symptoms: Flashing Check Engine Light and limp home mode triggered instantly and unexpectedly on XXX. There were zero warning symptoms, messages, or abnormal noises prior to that date INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

My Sonata 2016 suddenly lit up the Check Engine icon, which was blinking. It is available for inspection request, as it's in the shop right now. Added 2 qts of oil just to be safe. Was hoping the light would go away in the morning. It didn't. The car was sputtering and jerking while I was attempting to get where I was going, so I drove a little slower so it wouldn't stall out, which would have caused someone behind me to crash into me if it stopped suddenly. My mechanic said it was engine failure, possibly due to oil burning. Hyundai Dealer told me there is no recall for this issue, but my mechanic said there had been. I was never notified of such, and when I called them, they said that there was no recall, and she acted like she had never heard of the problem. I find that amazing, since on your website, there are some 717 claims of the same problem.

My 2016 Hyundai Sonata (VIN: [XXX]) has a serious safety issue involving excessive engine oil consumption. The vehicle loses oil rapidly between changes and requires frequent top‑offs to avoid engine damage. This creates a risk of sudden engine failure while driving. The dealership, South Charlotte Hyundai (10518 Cadillac Street, Pineville, NC 28134), refused to perform Hyundai’s official oil‑consumption test. Instead, they told me to pay $750 for a combustion cleaning and stated it would not fix the underlying problem. They would not document the refusal or provide any testing. I contacted Hyundai Corporate multiple times: • May 21, 2026 – Executive Office complaint submitted • June 3, 2026 – Follow‑up sent • June 29, 2026 – Regional escalation sent My Hyundai case number is XXX. As of XXX Hyundai has not responded to any of my Executive Office or Regional escalations. Only Customer Care replied with a template denial and no investigation. I have been waiting over two months with no action from Hyundai Corporate. I am reporting this because the manufacturer has not addressed a safety‑related defect, the dealership refused required testing, and the vehicle continues to consume oil abnormally. I am requesting NHTSA’s assistance in documenting this defect and Hyundai’s lack of response. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

EGR needs to be replaced as this is a major engine issue

Cylinder 3 misfire code and rough idle/driving car tries to stall out, engine is consuming a quart of oil every 500 miles and has 30psi compression in cylinder 3. Car only has 129k miles

My 2016 Hyundai Sonata 2.4L suffered an in-transit engine failure and entered emergency limp mode with an active P1326 rod bearing defect code, which is a recognized fire and safety hazard under NHTSA mandates. Service Campaign 953 was successfully completed on August 12, 2019, qualifying the vehicle for a lifetime settlement engine replacement. Walser Hyundai Brooklyn Park (RO #257457) has issued an administrative denial based solely on a prior-salvage title flag from a cosmetic theft recovery. The manufacturer is actively stalling a court-ordered federal safety recall remedy based on an administrative title brand, despite the engine compartment being structurally original and undamaged. Hyundai Corporate Case #42869828 is open but unresolved.

The contact owns a 2016 Hyundai Sonata. The contact stated that while driving approximately 60 MPH, the vehicle suddenly shut off with the message "HEV System Failure" displayed. The driver safely pulled over to the side of the road and restarted the vehicle. A towing truck arrived on the scene and reset the diagnostic codes before towing the vehicle. The vehicle was towed to the local dealer. The dealer retrieved several diagnostic trouble codes; however, the dealer was unable to determine the cause of the failure. The vehicle was test-driven but the failure was not duplicated. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was approximately 149,000.

After the emissions 9c2 recall car hesitant when changing an Hyundai has knowledgement of the problem but don’t have a fix

I was driving at night and my passenger headlights went out. About 2 years prior the same thing happened but it was the driver side headlight that went out. It was $1100 to get the driver side replaced and now here i am having to pay the same amount to replace the passenger side headlights. It was not a simple replacing the bulb. Something inside went broke causing the dealership to have to install a whole new headlight set.

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.

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

The following mandatory software update was performed on my vehicle: ECU SOFTWARE UPDATE FOR THETA II EMISSIONS IMPROVEMENT (SERVICE CAMPAIGN 9C2). After this update my vehicle drivetrain is quite erratic. In particular when the engine is cold it appears to jerk even when in Parking gear position. When cold the drivetrain experiences erratic gear shifts. This provides little confidence when driving and could result in safety issues when merging into traffic. Once the engine has reached its normal operating temperature it still makes occasional gear shift that are jerky and probably not good for the transmission. This vehicle had a very smooth transmission prior to the ECU software update, now I am hesitant when I need to merge into traffic, since I am not sure it will select the correct gear when accelerating. I have reported this to the dealership and Hyundai corporate service center and both indicate that when the engine is cold that the drivetrain can act strange, but once it is up to temperature it should be smooth. I have looked on the web and noticed multiple Hyundai owners with similar engines reporting the same issue after this software update. Hyundai may have satisfied the EPA requirements with this software, but they may have a created a safety issue for the vehicle operator and their passengers.

After completion of Hyundai Service Campaign 9C2, my 2016 Hyundai Sonata SE is very difficult to drive at low RPMs. Cold start its sluggish and jerks and driving uphill feels like transmission slipping but is not. An additional update to the ECM needs to be conducted ASAP.

My 2016 Hyundai Sonata is experiencing severe oil consumption due to a known Hyundai engine defect. The engine burns oil rapidly and loses more than a quart between oil changes. This creates a safety hazard because the engine can stall, seize, or fail while driving. The Hyundai dealership did NOT perform the official Hyundai oil-consumption test. They only checked the dipstick, noted the oil was low, and submitted a request for a paid combustion cleaning. Hyundai declined to pay for the cleaning, and the dealership is refusing to perform the required oil-consumption test unless I pay $750.00. Hyundai Corporate also refused to authorize the test, stating the vehicle is out of warranty, even though this is a known engine defect affecting many Hyundai vehicles. Without the official test, Hyundai will not review the engine defect or consider a goodwill engine replacement. This is a safety issue because the engine can fail without warning. The dealership and Hyundai are refusing to perform the required diagnostic test unless I pay $750, and refusing to review the defect without that test.

Dear Hyundai Customer Care, I am writing to report a safety concern with my 2016 Hyundai Sonata. The dashboard has developed significant cracking near the passenger-side airbag, which raises concerns about proper airbag deployment in the event of an accident. This level of deterioration seems premature and not consistent with normal wear and tear. I would like to know if there are any recalls, service bulletins, or assistance programs related to this issue, and what steps I should take for this issue as it is a safety concern for myself and passengers. I appreciate your prompt attention to this matter. This has had an ongoing issue for awhile.

This vehicle has a major engine flaw; Hyundai USA KNOWS about it, and STILL will not issue a recall for EXCESSIVE OIL CONSUMPTION. First episode: October 2023 at 86,371 miles. Dealership replaced leaking valve cover gasket and changed woefully-soiled spark plugs. Still under manufacturer warranty, but I paid the balance. Second episode: FOUR MONTHS LATER (Feb. 2024; 89,078 miles), another limp mode and Check Engine lamp. The spark plugs are soiled again with oil, so the dealership changes the spark plugs again, instead of addressing the underlying issue - Excessive oil consumption. Still under warranty, yet I pay the bill...AGAIN. Episode Three: October 04, 2024. Hyundai Sonata goes into limp mode again with CHECK ENGINE LIGHT illuminating – cylinder 1 was misfiring. All spark plugs fouled again; all spark plugs replaced. Valve cover gasket was leaking, so that was replaced as well. Yup, I paid for the repairs out-of-pocket. Episode Four: May 02, 2025. Vehicle goes into limp mode again, with CHECK ENGINE LIGHT turning on. Another spark plug fouled up, so it was replaced. Ignition coil replaced as well. Episode Five: June 19, 2025. Limp mode and Check Engine Lamp illuminates yet again, so Hyundai of North Charleston (SC) initiates an oil consumption test. "...[3.5 quarts of] oil consumption is excessive...", yet Hyundai denies everything. Hyundai is actually admitting to an underlying issue but offers ZERO assistance.

While driving my car with no warning light or any type of sound just cut off engine while driving. I was on busy highway going slightly uphill and was almost rear ended causing car behind me to swerve to avoid hitting me swerving to other lane and almost colliding into another car. I was able to get to middle divider almost but back end of my car sticking out in #2 lane. I was stuck in car for about 10 minutes then got across Street to sidewalk. There was no warning, no smoke etc prior to engine cutting off. Everything still works lights, a/c, radio etc . Engine tries to turn over but then slowly dies out like a battery issue however I have a 2 year old battery and when I charge it or try to jump start it it doesn't start also everything else powers on. I have had it stall 2 times before on L.A. freeway in which I somehow was able to cross over 4 lanes coasting to side of freeway. And at that time was sideswipped by another vehicle to front of car and car kept going and I really didn't have time to think about that while just trying to maneuver safely to side of freeway. The 1 and 2nd time it stalled it did restart after about 10 min. But this 3rd time it hasn't started again. The most recent incident was4/15/26. Another issue is the massive amounts of oil it consumes. I put in 2 quarts a week . But there is never oil leaking on driveway or anywhere its parked so where is oil going. I've had it checked several times and they said that these cars burn through oil and I also told Hyundai dealer about both issue and nothing was ever done. My s Check engine came on and I took in to shop and picked it up after paying alot of money and light was off but about a week later on. Took it back and pick up and lights off running good another couple thousand again. And on and off just randomly and auto mechanic shop said I would need to take to hyundai dealer to see whats happening. Called and told them never heard back. I have more pic of repairs but couldn't load more

Our Car is 2016 with 97000 miles with engine failure. Previous driving noticed the Engine will slow down suddenly at times. Preston Hyundai Dealer says bad engine cylinder $6000 is a fire hazzard and needs new engine. I see Hyundai sold 199000 2016 Sonatas and replaced 129000 bad engines. They gave a 120000 mile warranty to the 2016 cars. Hyundai said my car in not on the recall list so they will not pay for an engine. The dealer said the engine rods look okay. An engine should last longer than 97000 miles! Please help! [XXX] [XXX] [XXX] My INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

I am writing about my concerns on a 2016 Hyundai Sonata SE that I purchased for my daughter in October 2023. After purchasing I took it to my local Hyundai dealer to have it checked out. It was one of the cars that came with a lifetime warranty for the rods DO TO A DEFECT.On January 2024 my daughter was driving on the freeway when all of a sudden it just stopped accelerating and when checked it was a Knock sensor detection system. The dealer took it in and inspected and said it was a defective sensor and replaced it.This made me uncomfortable as I felt the sensor did its job and it was just a matter of time before the rod blew through.During the next few months it became very apparent that the car was going through unbelievable amounts of oil.It had a ticking so we replaced all the spark plugs and noticed oil saturating the plugs and realized a leak in the valve cover gasket which was also replaced.We thought this might be the cause but no oil was on the ground and nowhere on the engine.I just thought it was burning oil but no indicator lights were going off. The car could have no oil and it would not let us know. She's lucky to drive 300 miles a month.She has complained of a strong gas oder and we replaced 2 gas caps and went back to the Hyundai dealer.They told us there's a problem with the fuel filter and pump.If we pay $273 of inspections it might cover it if it's a failing part, and when I did the oil change the car was very low on oil despite the fact that we check it monthly and put 3 quarts of oil in the car.Her car is consuming 3-4 quarts of oil per every 250 miles.This could cause her engine to fail and possibly throw a rod which given the fact she has already taken out one Knock sensor it is just waiting to happen.So as oil disappears every few hundred miles without a warning the engine locks up and if a rod punches through onto the exhaust this can cause it to stall and potentially catch on fire especially when it wreaks of gas from the fuel filter.

I have a car covered by the Theta II Settlement. Engine, fuel system. Metal shavings found in oil and oil is diluted with fuel and oil if overfilled 1 inch above full mark on dipstick upon pickup from dealership. The vehicle is available for inspection at my residence; however, it is currently grounded as a known safety hazard. The vehicle is exhibiting symptoms of imminent engine failure (audible knocking, P0011 code, and oil dilution). Despite being shown evidence of this(photo and video of oil overfill and watery viscosity) , the manufacturer instructed me to continue operating the vehicle, placing myself, and other drivers at risk of a high-speed collision or vehicle fire. The symptoms (P0011 code and engine noise) were confirmed by an independent mechanic on March 25th 2026. However, during the official Bearing Clearance Test (BCT), the dealership intentionally overfilled the engine oil by 3 quarts (documented via photograph) to muffle mechanical noise and artificially pass the diagnostic and issued a pass on all inspections despite the oil hazard. Hyundai Corporate Case Manager Nikulmar Dhabi has admitted on record that the dealer was out of compliance by "being outside the standard notification time" yet they refuse to provide a safety-compliant remedy. Warning Symptoms & Appearance: Symptoms first appeared months ago when I repeatedly got a P0011 code, however On march 24th 2026 I received an engine light with a P0011 and the car going into limp mode while i drove. Warning signs included a persistent Check Engine Light (P0011) and audible metallic knocking. Upon checking the oil myself after the dealer "inspected" it, I discovered the oil was 3 quarts over the "Full" line, which is a deceptive practice used to mask rod bearing failure.

I am submitting this complaint regarding Hyundai Motor America’s denial of my request for engine replacement assistance. I own a 2016 Hyundai Sonata Hybrid with approximately 106,000 miles. The vehicle experienced sudden engine failure while driving which put my daughter, in danger and is now inoperable. I still have a remaining loan balance, and the cost to replace the engine is significant. I am the second owner of this vehicle. Prior to my ownership, it was a government vehicle. Hyundai requested maintenance records from before I purchased the vehicle; however, I do not have access to those records, as they were not provided at the time of purchase. Since owning the vehicle, I have maintained it responsibly and submitted all available maintenance records from my period of ownership outside of work issued directly to the state. My request for assistance was denied based on a determination of “exceptional maintenance neglect.” I respectfully dispute/ disputed this conclusion. I do not believe the engine failure was due to neglect, and I was not provided with clear documentation or evidence supporting this determination.

*Engine failure-needs a new engine *The car turned off while I was driving it on the freeway, I managed to steer the car to the shoulder, almost caused an extremely dangerous accident due to traffic and speed limit. *Took it to a Hyundai dealership in Irving, TX 3x about 3 years about excessive oil consumption, they ignored the requests for a solution. I stopped going to the dealership due to time constraints, and them not wanting to acknowledge the issue. The engine was consuming 2-3 quarts every 2 weeks. Finally the engine gave out last week. Car has around 153k miles but the issue started when the vehicle had around 100k miles . * Engine oil would turn on sometimes for a short time. I had several mechanics inspect the vehicle and all would tell me that it was just oil consumption due to a known issue with Hyundai engines.

Burning oil

The contact owns a 2016 Hyundai Sonata. The contact stated that while driving at an undisclosed speed, there was an abnormal odor inside the vehicle, with an abnormal sound coming from the engine compartment. No warning lights were illuminated. The failure had occurred on several occasions. The vehicle was taken to a dealer to be diagnosed; however, the dealer was unable to determine the cause of the failure. The vehicle was not repaired. The vehicle was taken to an independent mechanic, where it was diagnosed, and determined that oil was blowing out of the top of the engine. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 37,100.

The failure involves the engine, which has seized (locked up) and is available for inspection upon request. The vehicle became unsafe when it stopped operating in traffic, creating a potential hazard to myself and others due to the sudden loss of power and inability to move the vehicle. The issue has been confirmed by both a dealership and an independent service center, both of which determined that the engine has failed and requires repair or replacement. The vehicle has also been inspected by the manufacturer as part of the claim process. There were no prior warning lights, messages, or indicators before the failure occurred.

Engine siezed

I contact the Hyundai dealer about my 2016 Hyundai sonata. for all I know those vehicles have recalls with engine failure/stalling due to premature rod bearing wear, fire risks from malfunctioning electric oil pumps. My car is having those exact problems with the abs lights being on and is also have problems with the VVT sprocket. And the oil I called Hyundai and they said my vehicle only has a recall with the JUNCTION BOX. But my car is unable to go over 60. And is unsafe to drive and the recalls with that type of model car is the same recalls I am having and soon as I've bought the car and had it for some time i am starting to have those problems so I would like to know what’s going on because it is unsafe and I can’t even drive my vehicle I also have a blinking check engine light. I’ve wanted to report this now incase risk of a fire because I’ve did my research and realize these cars that have these type of problems are known for catching on fire.

Both rear doors will not open. The door locks stopped functioning so we are not able to open and close both rear back doors. In addition, the right rear door window stopped rolling up and down.

Car burning oil and engine started knocking no warning lights ever came on prior to knocking noise. Brought to mechanic and engine has failed. Vehicle has less that 130,000 miles on it.

This complaint is NOT related to the existing recall associated with this vehicle. The vehicle is experiencing a serious loss of power and acceleration issue. The car is unable to accelerate past approximately 60 mph. When pressing the accelerator fully, the vehicle does not respond or increase speed. While attempting to accelerate, the engine RPM increases and then suddenly drops repeatedly, causing the vehicle to struggle to maintain speed. This behavior is consistent and occurs during normal driving conditions. This creates a dangerous situation, especially when merging onto highways or attempting to accelerate in traffic, as the vehicle cannot respond when needed. The issue has occurred multiple times and makes the vehicle unsafe and unreliable to operate.

code P1326 unable to accelerate, drive past 1st gear and knocking noise in engine area engine could stall out or lock up if problem is not fixed 3/14/2026- started engine light blinking warning light also code p1326 has had recalls for this particular car brand

i took my car in for an oil change and the tech wouldn’t even take my money because he said the car was a safety issue and it needed to be taken to a hyundai dealership ASAP as he has seen the engine fail or blow up on this model before. on the way to the dealer the engine completely seized in the middle of the road forcing us to stop traffic on the busy road and push it in a near by parking lot.

Vehicle started then stalled requiring tow. No initial illumination of warning lamps or messages. Findings upon inspection by independent service center: multiple cylinder misfires (P030100, P030300, P030400, P030200, P030000) and excessive debris buildup on vvt sensor screen. Car uses excess oil- a minimum of 3 qts per 600 miles. No warning lamps or messages occur when car is excessively low on oil.

The contact owns a 2016 Hyundai Sonata. The contact stated that while driving and depressing the accelerator pedal, the vehicle failed to respond or exceed 30 MPH. The contact stated that the speedometer reading was lagging. The contact stated that the vehicle accelerated as intended while depressing the accelerator pedal with more force. The vehicle was taken to an independent mechanic, where the camshaft position sensor was replaced. Additionally, the contact stated that the starter was previously replaced due to the engine's failure to turn over while starting the vehicle. The contact stated that upon switching to Sport Mode and driving 40 MPH, the vehicle jerked and lost motive power. The contact shifted to neutral(N) and was able to pull to the side of the road. The vehicle was able to restart the vehicle, but the vehicle was undrivable. The vehicle was towed to an independent mechanic, where it was determined that the failure could be an electrical failure or that an engine replacement was needed. The vehicle was not repaired. An unknown dealer was notified of the failure, but the vehicle was not diagnosed or repaired due to the cost. The manufacturer was not notified of the failure. The failure mileage was approximately 152,000.

While driving in normal traffic, the engine experienced a sudden and significant loss of power and went into a reduced-power “limp” mode. The check engine light illuminated and the vehicle stored an active P1326 diagnostic trouble code related to the engine/Knock Sensor Detection System (KSDS). Because this occurred in live traffic, the sudden power loss created an unsafe situation that increased the risk of a collision, as the vehicle could not accelerate or keep pace with surrounding vehicles. This issue appears to be directly related to Hyundai Technical Service Bulletin 22-EM-001H-1, which addresses known engine defects and P1326 activation in this model and engine. The vehicle was taken to a Hyundai dealership in West Palm Beach, Florida for inspection, where the code was verified and documentation (including oil change records) was requested. The vehicle has approximately 89,000–90,000 miles. After the dealership inspection, I received an email from Hyundai Motor America Consumer Affairs [XXX] ) stating: “This is Hyundai’s final position in this matter, and we are unable to offer any assistance with regard to this claim.” I believe this position is incorrect, as the symptoms and P1326 activation align with the conditions outlined in TSB 22-EM-001H-1, which Hyundai is supposed to honor when these failures occur. To my knowledge, the vehicle/component has not been inspected by police or insurance representatives. The check engine light and reduced power symptoms first appeared at the time of the incident. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Vehicle experiences intermittent DTC C222908 (Integrated Brake Actuator internal circuit malfunction). Warning lights (Brake, ABS, ESC, Hybrid System) illuminate intermittently, brake pedal feel changes, and regenerative braking fails. Dealer confirmed stored code but refused repair stating "no current issue". This is a known failure in 2015-2019 Hyundai hybrids that can lead to sudden loss of hydraulic brake assist and increased stopping distance. Safety critical defect.

The car will randomly lose acceleration and jerk forward. It will make a beeping noise while the hev system warning flashes on the dash. It also says to turn off engine. While the warning is flashing and engine light is on it goes into a limp mode and you have limited acceleration. It has almost caused multiple wrecks when I go to acceleration from turning or at lights in traffic because I cant go over 20-30 mph. I have turned the car on and off and the hev system and engine light turns off and the car continues to work normal. It eventually comes back on and does the same loss of power/hev warning. It will be random and does not matter on how fast you are going to trigger the warning lights and loss of power.

The contact owns a 2016 Hyundai Sonata Hybrid. The contact stated that while driving at 20 MPH, the message "Shut Down" was displayed, and the vehicle lost motive power. The contact was able to pull over to the side of the road; however, the vehicle failed to restart. The vehicle was towed to the dealer, where it was diagnosed with engine failure, and the contact was informed that the engine needed to be replaced. The vehicle was not repaired due to the cost. The manufacturer was notified of the failure and declined to cover the repair under warranty. The failure mileage was approximately 140,600.

The contact owns a 2016 Hyundai Sonata Hybrid. The contact stated that while driving at an undisclosed speed, the vehicle went into LIMP Mode with several unknown warning lights illuminated. The vehicle was towed to the dealer and was diagnosed with engine failure. The contact was informed that the engine needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 70,000.

The contact owns a 2016 Hyundai Sonata Hybrid. The contact stated that while driving at an undisclosed speed, the vehicle inadvertently lost motive power. The contact was able to pull over to the shoulder of the roadway, and the message "Warning - Do not Attempt to Restart" was displayed. No warning lights were illuminated. The vehicle was towed to the dealer, who diagnosed a failure of the engine wiring harness. The vehicle was repaired, but the failure reoccurred. The vehicle was taken back to the dealer and was diagnosed as a failure with the engine wiring harness. The vehicle was not repaired. The vehicle had been back to the dealer several times. Recently, the contact was informed that the wiring harness was soy-based insulated, and rodents were causing damage to the wiring harness due to the smell. The manufacturer was notified of the failure but provided no assistance. The failure mileage was 80,000. The VIN was not available.

The contact owns a 2016 Hyundai Sonata Hybrid. The contact stated while driving approximately 65 MPH, the check engine warning light was illuminated, and the vehicle stalled. The contact was able to exit the highway; however, the contact was unable to restart the vehicle. The contact had the vehicle towed to a dealer to be diagnosed. The vehicle was diagnosed, and it was determined that the engine needed to be replaced. The vehicle was not repaired. The contact stated that prior to the engine failure, the engine had been replaced two years prior. The manufacturer was not informed of the failure. The failure mileage was approximately 180,000.

While on the highway vehicle started shaking violently, flashing engine light then service hybrid system along with every light on the dash! Car still running poorly, stiff steering very hard to slow down to get to safety! By the time I was able to pull over the engine was knocking and a burning smell was coming from the engine compartment. I popped the hood shut the car off , the exhaust manifold and converter(in one together) was so hot it was glowing! I’m thankful I was able to get to safety without it catching fire because it was on its way there! I called for a tow and sent it to the dealer where Hyundai is replacing the engine.

The contact owns a 2016 Hyundai Sonata Hybrid. The contact stated that while driving at an undisclosed speed, the driver's side sunroof detached. The contact stated that the sunroof was caught up on the netting in front of the sunroof. The contact stated that the tracks were fractured. There were no warning lights illuminated. The local dealer was contacted but the vehicle was not diagnosed or repaired. The manufacturer was contacted, and the contact was informed that the repair was not covered under NHTSA Campaign Number: 16V726000 (Visibility). The approximate failure mileage was 103,000.

The contact owns a 2016 Hyundai Sonata Hybrid. The contact stated while driving approximately 60 MPH, the check engine warning light illuminated, and the message "Check Hybrid System, Turn Off the Engine" was displayed, and the vehicle was shaking while decelerating. The vehicle was towed to the dealer where it was diagnosed with the Technical Service Bulletin: 198. The Technical Service Bulletin was completed; however, the failure recurred. The vehicle was towed to the same dealer where it was diagnosed with a drained battery and catalytic converter failure. The vehicle was repaired; however, the failure recurred. The vehicle was towed to the same dealer. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 147,000.

The contact owns a 2016 Hyundai Sonata Hybrid. The contact stated while operating the vehicle, the dashboard warning lights had suddenly activated and the vehicle went into LIMP Mode causing the vehicle to decelerate. The vehicle was taken to the local dealer on several occasions and the NOx sensor, intake manifold and EGR were replaced but the failure persisted. The manufacturer was notified of the failure, but no assistance was offered. The failure mileage was 104,000.

The wind guard for the panoramic sunroof of my 2016 Hyundai Sonata Hybrid broke & flew almost all the way off while driving down [XXX] in the Cleveland area. I was able to grab the end before it broke off completely and flew into traffic behind me. There was no warning prior to detachment. Hyundai insists this part failure is not part of a prior recall for this exact same product failure on this make & model and therefore will not cover. Their suggested solution is glue. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

While driving the car completely cut off i could not use my brakes my horn or steering wheel

My check Hybrid system light comes on and then my car stops allowing me to drive , the gas stops working ! This happened 3 times on the highway very dangerous

I was driving on the freeway and the car went from 70 mph to 60 then 50 then 40 slowing on the freeway each second. This has happened multiple times, each time taken in Hyundai and “repaired” only to happen a couple months later.

HEV WARNING TURN OFF ENGINE CAR STARTED SHAKING while driving on the interstate gas pedal went to the floor car started making a loud noise from the engine I put car in park and it would not move for 45 minutes at a stop sign

HEV WARNING TURN OFF ENGINE SIGN WHILE DRIVING ON THE INTERSTATE MY CAR LOST POWER AND THE CAR BEHIND ME HAD TO SUDDENLY MOVE OVER THIS IS VERY UNSAFE WHILE DRIVING DOWN THE INTERSTATE

As I was driving on the highway at 65MPH, a sudden warning appeared on the dashboard that read, "CHECK HYBRID SYSTEM/TURN OFF ENGINE". Immediately after that, I noticed that my vehicle started behaving erratically, making it difficult to control. I stepped on the gas pedal expecting the car to pick up speed and move forward. Despite the pressure I applied, the car failed to accelerate, leaving me stuck in my current position. After nearly causing a severe accident on a busy interstate, I was able to safely pull my car over to the side of the road. After conducting extensive research, I discovered that the issue I am facing with my hybrid vehicle is actually quite common among Hyundai Sonata Hybrids. It's surprising to note that despite this problem's prevalence, no recall or common solution has been provided to address it. I am highly concerned that Hyundai has not taken any action to address this issue. I request an immediate resolution as I could have been severely injured or lost my life today!

I was driving to work and suddenly my car gives me signal hybrid system alert turn off the engine and completely shut down on me as I was in the freeway. Thankful I made to safe area. I had it tow to the dealership and they are mentioning to me that they are not sure if is Power train module but they want charge me $1391. They say is not guaranteed that’s going to fix the issue the service advisor mentioned he could be the transmission or the engine. I’m just so overwhelmed because me taking there I thought they have everything figure it out. Communication with them is really hard to get through them they always giving me the round arounds. Please help

The contact owns a 2016 Hyundai Sonata Plug-In Hybrid. The contact stated that on three separate occasions while driving approximately 65 MPH, the “Check Hybrid System - Turn Off Engine” message was displayed. The check engine warning light illuminated. The contact then stated that the vehicle decelerated and went into LIMP Mode. The vehicle was towed to the dealer however, the failure could not be duplicated. The contact stated that the failure recurred. The vehicle was taken back to the dealer but the failure could not be duplicated; however, the contact stated that he provided diagnostic test data to the technician that displayed error codes however, the failure could not duplicated. The vehicle was not repaired. The manufacturer was notified of the failure and the contact was provided a case number. The failure mileage was approximately 65,000.

The contact owns a 2016 Hyundai Sonata. The contact stated that while driving approximately 55 MPH, the sunroof exploded without impact. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not notified about the failure. The contact stated that the failure was related to NHTSA Campaign Number: 16V726000 (Visibility). The failure mileage was approximately 130,000.

Panoramic sunroof wind deflector bonding failed. The detached wind deflector can come off while driving and interferes with the sunroof closing. It’s possible that the wind deflector and the glass sunroof could detach entirely while driving and cause an accident. I have used the sunroof feature less than 5 times since purchasing the vehicle in May 2019. There is a recall on this part for the Sonata Hybrids for the dates of 12/8/14 to 8/18/15. On 4/7/23 Long Hyundai of Chattanooga confirmed the problem and charged me $185.73 to look at the problem. They will order a new part and install it which will cost me $398.94. I declined because I think that this is a manufactured flaw that should be repaired by Hyundai at no cost to me. I have spoken at length with Hyundai customer service representatives and was informed that they would not repair it because it is not included in the recall. They recommended that I contact Better Business Bureau. BBB Auto Line informed me that NHTSA handles recall issues.

The contact owns a 2016 Hyundai Sonata Hybrid. The contact stated that while driving at approximately 60 MPH, the brake pedal was depressed and failed to respond. The "Stop Car, Check Brakes" message was displayed. The ABS and traction control warning lights were illuminated. The contact pulled over and turned off the vehicle, and stated that after restarting the vehicle, the warning lights were no longer illuminated. The vehicle was taken to a local dealer where it was diagnosed and serviced under NHTSA Campaign Number: 20V746000 (Engine) and 21V749000 (Exterior Lighting, Electrical System). The vehicle was repaired; however, the failure reoccurred intermittently. The vehicle was then taken to Homestead Hyundai (111 S Homestead Blvd, Homestead, FL 33030) where it was diagnosed that the power brake booster and rear wheel speed sensors needed to be replaced. The power brake booster was replaced; however, the failure reoccurred. The vehicle was then taken back to the dealer, and the wheel speed sensors were replaced. The manufacturer was not made aware of the failure. The approximate failure mileage was 130,000.

HEV turn off engine light pops up WHILE driving. I could’ve been on the highway or the middle of no where and have to turn off my car, just to turn it back on and it seems fine? This has happened a total of 5 times since owning this vehicle, and I’ve gotten all code on the car fixed about a month ago.

While driving the car getting error message on dashboard "Check Hybrid System Turn Off Engine", The Gas engine turn off and switch to continue on electric till able to pull on the side of the road. Turn Off engine, wait a min. Start car again and working fine. This issue appears randomly many times in the last two years while driving. Car was at dealer shop multiple times with no repair, was told we don't see active error message or they can't re-create the error. however scan show P261F error. Open Ticket with Hyundai #21018148 while car at the dealers for weeks at the time. each time told check engine got back on but not the message they are looking for.

The contact owned a 2016 Hyundai Sonata Hybrid. The contact stated that while driving approximately 25 MPH, the steering wheel became firm while navigating a turn, and the vehicle crashed into a tree. There were no warning lights illuminated. The contact was unconscious and woke up to being treated by an EMT. The contact sustained injuries to his chest and fractured ribs. Medical attention was provided at the hospital. The air bags deployed as needed. A Police report was filed. The vehicle was towed to a tow lot. The vehicle was deemed a total loss. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 13,000.

The contact owns a 2016 Hyundai Sonata Hybrid. The contact stated that while his wife was driving at a slow speed out of the driveway, she heard a knocking sound coming from under the hood. The check engine warning light was illuminated. The vehicle was towed to the dealer where it was diagnosed that the engine needed to be replaced. The vehicle was repaired; however, the failure recurred. The contact stated that after the vehicle was retrieved from the dealer, the check engine warning light illuminated after 300 miles. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 163,000.

The contact owns a 2016 Hyundai Sonata Hybrid. The contact stated that while his son was driving at an undisclosed speed, the vehicle lost motive power. The vehicle was towed to the dealer, where it was diagnosed with low oil and engine failure. The vehicle was not repaired. The contact related the failure to NHTSA Campaign Number: 20V746000 (Engine). The manufacturer was made aware of the failure. The failure mileage was 67,036. The contact noted that the failure speed was approximately 40 mph. It wasn't long after purchasing the vehicle that the engine seized while driving. The contact stated that the manufacturer will not honor the warranty due to the incident occurring from "an outside influence". Said influence is unknown to the contact.

While driving the hybrid system warning light comes on and says to check hybrid system, vehicle goes into limp mode will not accelerate over 25 mph and codes need to be cleared before vehicle van be driven. This has caused me to almost have several accidents. The vehicle slows down and gives no warning prior to this occurring. It has started happening more frequently vehicle currently has 85k miles.

While driving on the highway at speed, I received a red Check Hybrid System error, and immediately lost all acceleration, putting myself and all occupants at risk on a busy interstate highway, as we tried to find a safe way to quickly change lanes and coast to a stop in a safe location. The cause is under diagnosis by a Hyundai Service Center. This was a sudden failure and there had been no previous warning alerting us to substandard system condition.

The contact owns a 2016 Hyundai Sonata Plug-In Hybrid. The contact stated while driving 70 MPH or faster in Hybrid Mode, the vehicle stalled. The HEV error warning light was displayed on the instrument panel. The check engine warning light was also illuminated. The contact turned off the vehicle and disengaged the HEV Mode for the vehicle to restart and function as intended. The failure occurred three times. The vehicle had been taken to the dealer however, the mechanics were unable to determine the cause of the failure. The vehicle was not repaired. The manufacturer was made aware of the failure and opened a case. The approximate failure mileage was 66,000.

The contact owns a 2016 Hyundai Sonata Hybrid. The contact stated while driving approximately 65 MPH, several unknown warning lights illuminated and the vehicle decelerated independently. The contact was able to park on the side of the road before the vehicle stalled. The vehicle was not drivable. The contact towed the vehicle to a local dealer, where it was diagnosed with needing the knock sensor to be replaced. The vehicle was repaired. The manufacturer had not been informed of the failure. The failure mileage was 34,252.

My 2016 plug in hybrid Sonata repeatedly inidcates that there is "high system temperature switching to hybrid mode." This first happened on my first long trip in the car in 10/21 and has happened repeatedly since. This happens at all temperatures, including moderate temperatures (mid 70s). It seems to happen randomly, such as when battery has several miles of charge left in it, when it is fully discharged, and repeatedly when the car is already running in hybrid mode, which a driver could interpret means that the engine is about to shut down, as I did on a long trip. I have taken it to two separate dealers, and the only thing they did was replace the fuel pump, which did not solve the problem. In addition, the battery life has reduced greatly, despite the fact that I always fully discharge and recharge the batter. As you can see from the attached Hyundai forum comments, this appears to be a prevalent problem for this make and model car and no relief from the manufacturer appears to be on the horizon.

My vehicle first went into limp mode and stalled while driving December 2021. Vehicle was taken to Dealership in Alpharetta, GA. I was advised the knock sensor needed an update. The update was completed but the vehicle continued to go in limp mode and stall again March 2022 after driving less than 1000 miles since previous repair. The vehicle was taken to dealership in Wake Forest, NC. This time there was no update for the knock sensor so I was advised they would need to replace knock sensor but it was on backorder until end of May 2022. The knock senor was replaced picked up vehicle and engine light came on by the time I had drove 50 miles and vehicle started to go in limp mode and stall again and car started shaking an bad vibration. Drove the car next morning and it put me down again going into limp mode, stalling, whole dash board lit up every warning light on and dinging, car shaking and made loud noise had to have towed back to dealership. This time dealership claim it came from misfire on cylinder 3 but that doesn't explain all the issues. I was called to pick up car again June 2022 car had bad vibration, knocking, still going into limp and stall mode, hybrid system warning light came on again, gear sticking not changing like it's supposed to had towed back to dealership. This time dealership replaced other 3 cylinders picked up car July 2022. Did a test drive advised car is still stalling, gear still sticking, vibration still , air not cooling and hybrid indicator needle bouncing back and forth from power to 80 never stabilized. Dealership claims can't find anything wrong. I have almost been hit 10 times since December 2021 because of vehicle going into limp mode while driving this is very dangerous to be going 55 to 70 and vehicle drops speed back to 10 all of a sudden in traffic

The car requires a quart of oil every 1 to two weeks. Brought it to multiple dealerships and was never given a reason why. Car was making knocking noises anytime driven at 45 or below and sometimes higher. We believe it had to be about the recall Hyundai has advised us about multiple times. We brought it to them on Friday July 22nd. They updated the Hybrid system and we left. Driving the car to work July 27th and the car went into “limp” mode and stated that there was a issue with the hybrid engine and to shut the car off immediately. I was able to pull the car off the road and turn it off. The engine light constantly blinked when the error happened. When I shut the car off and turned it back on, it the same hybrid error shows up on the screen again. We had to have it towed to the same dealership we went to the previous day. They have to diagnose the issue but it might take weeks because they have one hybrid tech.

There is a recall outstanding that for some reason isn't associated with my car's VIN so the manufacture Hyundai is refusing to pay or make repairs. They even suggested that I buy a part that should fix the problem, after paying $246.75 for the part; the problem remained. The recall number is 16-01-067 for 2016 SONATA (LF) and SONATA HYBRID (LF-HEV); my car is a 2016 Sonata Hybrid. SUBJECT: PANORAMIC SUNROOF WIND DEFLECTOR PLATE REPAIR (RECALL 152) Description: Certain 2015 and 2016 model year Hyundai Sonatas and 2016 Sonata Hybrids come equipped with an optional panoramic sunroof. The sunroof assembly incorporates a wind deflector to help reduce wind noise in the passenger compartment when the sunroof is open. If the wind deflector becomes partially detached from its mounting bracket while the sunroof is open, the deflector can interfere with the closing of the moveable sunroof panel. In some cases this interference can result in the sunroof panel detaching from its mounting tabs. If the sunroof panel detaches while the vehicle is in motion, the panel could become an obstacle to other drivers, increasing the risk of a crash. The wind deflector on my car detached a year ago and after several requests to fix the detached deflector the dealership hasn't and refuses to recognize the recall. Is there a way to help get my car's VIN appropriated associated to this recall so if can be fixed?

The contact owns a 2016 Hyundai Sonata Hybrid. The contact received notification of NHTSA Campaign Number: 21V749000 (Exterior Lighting, Electrical System) however, the part to do the recall repair was not yet available. The contact stated that the vehicle was unable to start. The vehicle was towed to the dealer; however, the vehicle was not diagnosed nor repaired and remained at the dealer. The manufacturer was made aware of the failure and a case was opened. The failure mileage was approximately 110,000. Parts distribution disconnect.

The contact owns a 2016 Hyundai Sonata Plug-In Hybrid. The contact stated while the vehicle was approaching a stop sign, the vehicle stalled. The contact stated there was no warning light illuminated. The vehicle was not drivable. The contact stated he manually pushed the vehicle to the side of the roadway. The contact went back with his trailer and trailered the vehicle to the local dealer where it was diagnosed with needing the Hybrid control unit to be replaced. The vehicle was not repaired. The manufacturer had been informed of the failure. The failure mileage was approximately 120,000.