2016 HYUNDAI SONATA Fuelpropulsion System Problems

My 2016 Hyundai Sonata (2.0T/2.4L engine) has been experiencing loss of motive power and severe engine stumbling at stoplights, creating an unreasonable risk of a crash in traffic. The Check Engine light is on with DTC P0010. Upon inspection, the internal oil seal plug at the intake camshaft E-CVVT has become unseated, causing an active oil leak. This matches the exact defect and symptoms (elevated idle of 1,200–1,400 RPM and power reduction) described in Hyundai Service Campaign TX3 (TSB 15-01-022-1). While that campaign only applied to 2015 models, my 2016 vehicle has suffered the identical failure. I am requesting that this safety-related defect be investigated for 2016 models to prevent potential engine fires from oil leaks or accidents from sudden power loss

This vehicle has experienced multiple hybrid system failures while driving, including a complete loss of power “Hybrid System Warning – Turn Engine Off” on the interstate in June 2022 through November 2025. These events have placed me and my loved ones in dangerous driving situations. Despite a warranty‑covered engine replacement at 82,015 miles (January 2023), the same hybrid system issues have recurred. Hyundai initially indicated a warranty claim was submitted, then told me there was no record of any claim in the system. The dealership claims it was denied — creating a serious inconsistency in communication and accountability. In addition, I have identified multiple NHTSA complaints in the database from other owners of 2016 Sonata Hybrids (VINs beginning with KMHE) describing similar highway shutdowns and hybrid system failures, which raise concern about a broader, unaddressed safety defect not currently covered by existing TSB or recall actions. I am respectfully requesting:...

The problem with my vehicle is a failure of internal engine components, specifically a known defect in the piston rings of the Hyundai Theta II engine. This failure causes excessive oil consumption, which is burned internally. The internal engine components have failed, leading to a widely documented defect in the Hyundai Theta II engine. The primary symptom, which began to get serious around 80,000 miles, is the constant need to add oil to the engine every two weeks. If I do not do this, the low oil warning light illuminates on the dashboard, serving as a continuous alert of the problem. This failure was officially confirmed by an authorized Hyundai dealership. About two weeks ago, they first documented that there were no external leaks on the vehicle. When I returned because the oil had been consumed again, they performed a new diagnostic, for which I paid over $300, that confirmed...

I am reporting a serious safety concern involving my 2016 Hyundai Sonata Hybrid, which has experienced multiple hybrid system shutdowns while driving. This includes repeated complete power loss incident on I-90 beginning in June 2022, when my daughter was driving home after her hospital shift. The vehicle displayed a “Hybrid System Warning – Turn Off Engine” message and had to be pushed off the highway and towed. This was the first of several hybrid-related failures that culminated in a full engine replacement under warranty at 82,015 miles — and now, the same hybrid system warning has returned at 127,592 miles, well within Hyundai’s 150,000-mile hybrid warranty. Hyundai is currently denying coverage. I am requesting that NHTSA investigate repeated hybrid system faults and warranty denial patterns in Korean-manufactured Sonata Hybrids.

I had engine issues back in 2021. I had to pay $600 for a part to be installed to fix the problem . The engine failed, the idle was violently lurching forward and would randomly Shut down. Recently the car shut down without warning again. Its scary.

Car keep stalling misfire just started muffler sound smoke lack of power when driving

The fuel pump where the fuel line connects to it is cracked and squirting fuel all over that area. Some time ago I started smelling fuel when getting close to the vehicle or when opening windows. Took it to a shop to have it checked out and the technician couldn’t find the problem, since there is no check engine light on or any type of warning. A few days ago I decided to check the bottom part of the fuel tank and noticed that there were traces of leaking fluid. Reached to it and checked it closely and certainly was fuel dripping. Checked the top of the tank where the fuel pump is and found out that the problem was there. Did some research online and found out that that’s a very common fail. I Would like to have it investigated and recall all those failing cars for my safety,...

I was driving a 2016 Hyundai Sonata on a mountain highway and it started to run rough and lose power dramatically when accelerating. A dangerous situation on a steep curvy highway that has many one lane sections. Shortly thereafter a dash light came on. There was no warnings or dash lights or symptoms prior to this incident. I took the vehicle to a mechanic and ran the code. It said there was a misfire in cylinder 3. Replaced the ignition coil and spark plug for cylinder 3 and it did not fix the problem. The mechanic then pulled the motor to check the valves. Valve 3 was burnt, had a hole and stuck open. The car had approximately 75,180 miles. Well within the warranty time frame of 10yrs or 100,000 miles for an original purchaser. The mechanic had the valve machined, and replaced the head gasket and reassembled the the...

My 2016 Hyundai Sonata started using and leaking oil in August 2023 when it had about 129,000 miles and when you tried to go faster than 55 miles per hr. it would not accelerate. We feel there is a danger to drive it in traffic. We took it to the dealership in Pensacola, FL. They found a valve cover gasket had multiple leaks which they replaced. Found a code P1326 (whatever that means), Performed T3G campaign and followed a flow chart and BCT test passed. Don't know that any of this addressed the fact that the motor won't accelerate. Charged me $3,000 for something. Car ran okay for a while and started doing the same thing again. In June of 2024, took it to local mechanic who ran diagnostics and replaced a coil and plugs which cost another $600. It ran a little better until August 2024 and took it...

We were told from Tulsa Hyundai that our car was involved in a massive recall due to engine failure and that the warranty had been extended to 150,000 miles on Theta engines. They told us we had to follow the process in order to have a claim submitted to Hyundai corporate. They required us to pay for a valve gasket replacement and a valve cover gasket ($1000), then to take the car home and drive for 1000 miles and then bring it back in. We brought it back in and were required to pay for a combustion cleaning (around $800) and then take it home and drive it for 1000 miles. We brought it back in and they performed the oil consumption test. They then submitted the claim to Hyundai and we heard back the next day (9/18/2024) that they were denying they claim due to it being an issue...

Background Info : On November 28th, 2023 I filed a case with Hyundai Consumer Affairs due to smoke and sparks coming from my 2016 HYUNDAI SONATA engine. I was assigned to a Case Coordinator Carla who did not provide her last name at telephone 714-694-4963. She was my contact person for the repair. I signed a tow authorization on November 28th , 2023 authorizing HMA to tow the vehicle to the nearest Hyundai dealership due to some delays in coordination on behalf on my contact Carla and the dealership Pohanka Hyundai received my vehicle on approximately December 4th, 2023. Per correspondence from Carla she had contacted the dealership with no response until the 18th of December 2023; approximately two weeks after the dealership received my vehicle. She informed me that she had made countless attempts to reach a service team member for follow up on an inspection. On December 18th...

Car stalled check engine light came on took to auto zone said a engine problem

I keep having the same issue with this vehicle's fuel/propulsion system, power train, engine, cruise control. This vehicle is need it's fuel system cleaned now for a 3rd time in less then 2 years. I have done the high mileage maintenance on it as well. I drive the vehicle less than 5,000 miles a year. When I am driving the vehicle, it struggles to speed up, making me press on the gas repeatedly to get to the indicated speed limit. The vehicle does not slow down as it should when pressing on the brakes. I have to press repeatedly over and over and harder on the brakes in order for it to slow down. The vehicle jerks, speeds up without me pressing on the gas and sometimes it will not stop when prompted. I cannot put this vehicle on cruise control, because it speeds up and out of no where,...

Hybrid system failure, car stopped in the middle of traffic

My car idles very rough at times, and sometimes when idling, it dies out. At times it is difficult to even start as if it's not getting the electrical signal to the engine. Hyundai replaced the fuel pump, but that did not fix the problem, but cost $1,200. No warning messages. Two other automotive companies also did a diagnostic tests, but couldn't find the problem as it seems it has to be tested WHEN IT IS ACTING UP. It died on me far from home a week ago, but eventually restarted. I'm afraid to drive it especially at night as it died when idling at a light and almost didn't restart.

2016 Hyundai Sonata (not part of any recall) driven short distance on expressway had "check engine light" come on. Pulled off of expressway and checked under hood...No visible issues. Chose to return home via side streets as car was riding rough and having problems with acceleration at that point. Short while later, heard loud noise and saw smoke coming from under hood. Pulled to the side of the road and exited car. Was told by bystander that car was on fire. Called Fire Dept, by the time of their arrival, entire front end ablaze, tires and body melted. Thankfully, fire extinguished before any explosion or damage to neighbor's property occurred. Vehicle was a total loss.

The engine is consuming oil at abnormal rate. After receiving an oil change at a credible business the car is out of oil in a week. Hyundai will not check for oil consumption if the mileage is above 85k miles. Myself and my children can be stuck on the side of the road for engine failure due to the lack of oil. Express oil has stated this is not normal and a cause for concern. There are no warning signs for this problem. Only awareness from the performance of the cars decline to run properly.

My oil seems to be consumed really quickly! I get a full synthetic oil change and then my engine sounds strange and check the oil and there's no more oil in there! This is after less than 1,000 miles after the oil change! It's very expensive that every few months I need to go and get a new oil change, it's supposed to be every 6 months or after 5,000-7,500 miles with full synthetic but it only last about 700 miles before it starts to start to disappear! I'm scared it will cause my engine to get ruined and make a fire! This has been going on formore than 2 years now.

my 2016 Sonata SE vin #[XXX] has a engine recall, Hyundai gave me a lifetime Warranty of the engine and power train. the Sonata has 84577 miles on the engine and is using 1 QT of oil per 1,000 miles. took the car to Bentley Hyundai in Huntsville ,Al. for an oil change and to see what they will do about the oil issue. I'm to bring the car back to them in 1,000 miles for them to check out how much oil the car is using. I was told that even with the lifetime Warranty of the engine and power train that with the engine using a quart of oil that Hyundai won't do many thing to take care of the problem. If the engine was given a Lifetime warranty by Hyundai why won't they do any thing to correct the oil problem. Thanks [XXX] INFORMATION Redacted PURSUANT TO...

I have been going to the dealership since July as my engine light was not shutting off. I kept being told that there were no loaner cars and that they could not fix the problems I was having kept putting a band aide on the issue and saying that I would have more problems. They told me the cat converter would need to be replaced but it was an engine recall issue. They had a loaner car for me for one day told me it was fine that it would probably go again I had them check the car again and they filled the oil and sent me on my way. Now I was on the side of the road with no car and am now being told they can’t work on my car until March which since I have been seeing them for 4 months now for the same...

MY RIGHT HIGH BEAM STOPPED WORKING, I HAVE TO ADD OIL TO MY CAR EVERY 3 DAYS. BURNS MORE GAS GOING BACK AND FORTH TO WORK. GOING AROUND A FAST HIGHWAY CURB, THE ENGINE SHUT DOWN THE SPEED OF MY CAR AND WOULD NOT STOP DROPPING DOWN TO 45 MPH IN A 70MPH PACKED HIGHWAY. AWFUL EXPERIENCE. CALLED IN THE PROBLEM TO HYUNDAI AND THEY DIDN'T SHOW ANY CARE. I HAD AN ACCIDENT HAPPEN AND I DON'T KNOW IF THE ELECTRICAL PROBLEM COULD BE A RESULT TO THE ACCIDENTS. THE CASE HAS BEEN CLOSED AND NOTHING BUT A PAPER FROM A LAWYER ABOUT GETTING $1000 FOR MY CAR BEING AT HIGH RISK. I HAVE THE CASE NUMBER AVAILABLE. IT'S BEEN NEARLY A YEAR.

WHEN ACCELERATING THERE IS A TICKING NOISE COMING FROM ENGINE. THIS HAS BEEN HAPPENING FOR A WHILE AFTER I GOT THE UPDATE AND NEW WIRING HARNESS FROM THE CAMPAIGN. I'M SCARED TO DRIVE MY CAR, I ACCELERATE SLOWLY BECAUSE I GET NERVOUS IT WILL BLOW UP. I TOOK THIS CAR TO A HYUNDAI DEALERSHIP AND THEY QUOTED ME OVER 500 DOLLARS FOR THIS REPAIR AND IT MIGHT NOT EVEN FIX IT.

CAR RUNS OUT OF OIL WELL BEFORE 2000 MILES/2 MONTHS. WHEN ACCELERATING THE CAR IS SLUGGISH THE ENGINE IS TICKING AND FEELS LIKE THE ENGINE IS GOING TO SEIZE, NO MATTER IF THE CAR IS MOVING 5MPH OR 70 MPH.

2016 SONATA WITH 103,000 MILE. INCREASED OIL CONSUMPTION. REGULAR FULL SYNTHETIC OIL CHANGES HAVE BEEN FOLLOWED. THE ENGINE BURNS OUT OIL WELL BEFORE OIL CHANGE IS DUE. OIL LAMP FLICKERS. MECHANIC STATES OILS IS BURNING UP AND RELEASED THROUGH EXHAUST THEREFORE NO LEAKS DETECTED. 2ND ISSUE: P2122 CHECK ENGINE CODE. DIAGNOSTICS REVEALS PEDAL ACCELERATION SENSOR FAULTY. PART WAS $202. NOT SURE IF THIS IS MISDIAGNOSED AND RELATED TO SLUGGISH ENGINE DUE TO OIL CONSUMPTION.

AFTER A PERIOD OF DRIVING, WHICH IS RANDOM AT BEST, THE CHECK ENGINE LIGHT WILL APPEAR AND THE VEHICLE WILL START TO SHUDDER AND LOSE ITS ABILITY TO ACCELERATE. THIS HAPPENS WHEN THE VEHICLE IS IN MOTION AND HAPPENS BOTH ON THE FREEWAY AT HIGH SPEEDS, AS WELL AS ON CITY STREETS IN LOW SPEEDS. THE ONLY WAY TO GET THIS TO STOP IS TRY AND GET TO A SAFE SPACE OF THE ROAD AND TURN OFF THE VEHICLE. IT IS VERY SCARY AND DANGEROUS ESPECIALLY IN SOUTHERN CALIFORNIA FREEWAY TRAFFIC AND IN MOUNTAIN PASSES AS YOU LOSE THE ABILITY TO MAINTAIN SPEED IN THE MIDDLE OF TRAFFIC. THIS COULD VERY EASILY CAUSE AN ACCIDENT. THIS HAS HAPPENED TO ME ON 7 DIFFERENT OCCASIONS OVER THE PAST 2 MONTHS AT RANDOM TIMES.

VEHICLE IS UNABLE TO START FOR ABOUT 30 MINUTES AFTER DRIVING FOR 60 MINUTES IN ANY WEATHER CONDITION FROM VERY COLD TO HOT. "CHECK HEV SYSTEM" WARNING COMES ON WHEN THIS HAPPENS AND WILL NOT START. HAPPENS AFTER A QUICK STOP WHILE HIGHWAY DRIVING

I LIVE IN STAMFORD CT 06902 I WENT IN A TRIP WITH MY KIDS TO VIRGINIA BEACH LAST SUMMER 2019 THEN I STOPPED A REST STOP FOR BATHROOM WHEN I CAME BACK TO TURN ON THE CAR THE CAR WAS WITH NO POWER IT CAME ON MY PANEL TELLING ME THE HYBRID SYSTEM FAILURE I WAITED 1/2 HOUR AND WORK AGAIN .A WEEK AGO HAPPEN ME THE SAME ISSUE AGAIN I AM WORRIED BECAUSE IT COULD HAPPEN WHILE I DRIVING I CAN'T RELY ON THIS VEHICLE

I WAS DRIVING THE CAR AND THE CAR STARTED SPITTING AND DID NOT WANT TO GO. THEN WHITE SMOKE CAME OUT OF THE TAIL PIPE. I CUT THE CAR OF AND WAITED IN TRAFFIC WITH MY BABY IN THE CAR , THEN TURNED THE CAR BACK ON. THE ENGINE LIGHT CAME ON AND THE CAR DROVE LIKE IT HAD NO ENERGY. I WAS ON MY WAY TO MY NEW JOB FOR THE FIRST DAY.

WHILE THE VEHICLE IS IN MOTION AND WHEN I HIT THE BRAKE. A CLICK NOISE IS ALWAYS COMING WHEN WE HIT THE BRAKE TILL THE END. ALWAYS HAPPENING OBSERVING FROM PAST 2 MONTHS. THE OTHER PROBLEM IS WHEN WE HIT THE BRAKE AND AND HOLD THE SHIFT KNOB IT IS MAKING TICK TICK NOISE. ALWAYS HAPPENS WHEN I SHOWED TO THE MECHANIC THEY ARE SAYING IT IS NORMAL BECAUSE THEY HAVE TO DO IT FOR FREE OF CHARGE. HYUNDAI GIVES WARRANTY BUT THE DEALERS NEGLECT TO DO. I AM GETTING A MILEAGE OF AVERAGE 10 MILES IF I EVEN MAINTAIN A SPEED OF 45-50 MPH. IF I PUT 14 GALLONS OF GAS I GET HARDLY 225 MILES AND I HAVE NO PROBLEMS WITH THE CAR AND I CHANGE THE OIL BEFORE THE SERVICE INTERVAL.