The contact owns a 2016 Hyundai Tucson. The contact stated that the check engine warning light was illuminated, and there was a ticking sound coming from the front of the vehicle. The vehicle was taken to Auto Zone, where a mechanic diagnosed the vehicle with a knock sensor failure. The knock sensor was replaced. The mechanic informed the contact that the vehicle was included in Manufacturer Campaign: CS966 for the transmission control module (TCM). The vehicle was taken to the dealer, who confirmed that the vehicle was included and the software update was performed. After the vehicle was repaired, the check engine warning light was no longer illuminated; however, approximately 30 minutes later, the vehicle failed to exceed 35 MPH, and the check engine warning light started flashing. The vehicle was returned to the dealer, and the contact was informed that the software update caused the vehicle to enter LIMP Mode to protect the engine. The dealer informed the contact to drive the vehicle for 30 days or a total of 500 -1000 miles, and if the vehicle continued to enter LIMP Mode or failed to operate as needed, to return the vehicle for the engine to be replaced. There were no additional repairs performed. The manufacturer was not informed of the failure. The failure mileage was approximately 125,000.

- Cleveland, OH, USA

I have diligently maintained the vehicle with all scheduled services performed at the Rick Case Hyundai dealership. My maintenance records show a documented history of proper oil changes and other essential services. These records confirm that the vehicle was regularly serviced according to the manufacturer's recommendations. The diagnostic report from the dealership indicates bad piston and heat marks, but there is no evidence to suggest this was caused by a lack of proper maintenance.

- Plantation, FL, USA

I am filing this complaint regarding my 2016 Hyundai Tucson due to excessive oil consumption. The vehicle burns oil at an abnormal rate, requiring me to add approximately one quart of engine oil every one to two weeks, even though the vehicle is driven very infrequently. This condition poses a serious safety risk because the engine could run low or completely out of oil while the vehicle is in operation, potentially causing sudden engine failure. This vehicle is used to transport my family, including children, which puts their safety at risk. I have taken the vehicle to Hyundai dealerships multiple times for full ispection, but no defect, warning, or solution was ever identified or communicated to me. There have been no warning lights or messages on the dashboard to alert me of low oil levels or engine problems, increasing the risk of failure without warning. The problem is ongoing and repeatable, and the vehicle and engine are available for inspection upon request.

- Sanford, FL, USA

There is a major problem with certain year Hyundai vehicles from 2016-2021 with the engine burning oil and clogging up the exhaust. My moms vehicle has been at dealership for evaluation and combustion cleaning multiple times and the problem still continues. There has been times where she is driving car and it starts to bog down and loose power which is a safety issue especially if on highway. The vehicle is burning oil, occasionally have to add oil. The engine light does come on at times. The car has been at dealership for recommended oil consumption test at every 1000 miles and has not passed. Combustion cleaning done each time and sent on way. Called and made complaint with Hyundai corporate and and got no where. The tech department at Hyundai factory gave dealership recommendations to do which were completed and still having same issue. The factory was only willing to cover 70% off the cost of new catalytic convertor and my mom to be responsible for remaining balance. Hyundai claimed that the convertor was out of warranty 8 years/80,000 miles even though this has been going on for past 2 years. This is not a problem caused by consumer but an issue with factory. Hyundai not living up to there 10 year/100,000 mile warranty as they advertise. There are facebook groups with people having same problems as we are with dealership not really doing anything other than combustion cleaning as advised by factory and corporate not doing anything either. I believe this is a major safety/defect issue with engines in these Hyundai Vehicles. What happens when someone is on the highway and the vehicle bogs down and another vehicle comes from behind and slams into you?

- Waterbury, CT, USA

The car has been diagnosed with internal engine failure by both an independent service center and a dealership service center. The issue was described as a rod timing issue causing knocking, leading to failure of the engine. A light was not on for a majority of the issue but did start flashing before car became completely undrivable. The car was sold to me with this issue and has been driven for nearly 3 years with a power loss issue that was dismissed as turbo lag or other issues. Driving a car with this issue that does not alert with a check engine light is a major threat to driver and passenger safety as it can result in engine seizure and vehicle fires. The engine issues began at the least before 58,000 miles, with total failure occuring at roughly 96,000 miles. Hyundai is known for this issue, particularly in turbo model engines. Only once during ownership of the car did the check engine light come on prior to engine failure. When checked, it was described as a catalytic converter issue. The service center also did an oil change on the car, and the light went off. The check engine light did not come on again for more than a year. The check engine light did not come on until after the issue was diagnosed by the independent service center it was taken to in January 2026.

- Clarksburg, WV, USA

On my husband's way home from work he explained to me that the car had a "hiccup" and then an engine light blinked on, then it died at an intersection. He was pretty close to home so he got it started again and drove it home. He replaced spark plugs and coil packs and it still had a misfire. We took it to an auto repair shop where they did a scan and told us it had a dead hole in cylinder 2 and that it needs a full engine replacement. The car also had an oil change just before Thanksgiving. My husband checks oil regularly and added a quart a month before the oil change and it seems to consume more oil then it should.

- Bonney Lake, WA, USA

Numerous issues with this vehicle. Now, when having oil change, told by the hyundai service center that it is using excessive oil and may need a new engine. In researching this problem, have discovered hyundai has had several problems with excessive oil consumption in their many of their hyundai vehicles, including the 2016 Tuscan

- Quincy , IL, USA

My 2016 Hyundai Tucson experienced engine failure consistent with known Hyundai engine defects. After reporting multiple battery outages, rapid oil consumption, and limited acceleration ability, outstanding warranties were checked and updated. However, the issues persisted, and the engine failed suddenly while I was driving. Hyundai denied warranty coverage without proof of the issues being unrelated to the warranty. This presents a serious safety hazard due to unexpected engine failure.

- Olive Branch, MS, USA

The contact owns a 2016 Hyundai Tucson. The contact stated that after coming to a complete stop, the vehicle failed to accelerate as intended while depressing the accelerator pedal. The vehicle went into LIMP Mode. In addition, the vehicle failed to accelerate above 30 MPH. No warning light was illuminated. The vehicle was taken to several dealers. The contact was informed that the unknown hoses and the dipstick melted inside due to the engine overheating. The contact stated that the catalytic converter was replaced; however, the failure persisted. The contact stated that the catalytic converter had been replaced three times since the first failure. The contact stated that on a separate occasion, the engine was consuming an excessive amount of engine oil. The contact was adding engine oil every two weeks. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The failure was a recurring failure, and the contact drove the vehicle intermittently due to the safety concerns. The manufacturer was not made aware of the failure. The failure mileage was approximately 90,000.

- Alameda, CA, USA

While driving under normal conditions, my engine experienced a sudden and catastrophic failure. The check-engine light illuminated, the vehicle began shaking violently, and I was forced to pull over immediately due to safety concerns. There was no prior warning and no oil pressure or oil warning light activated at any time before or during the failure. After stopping safely, I checked the oil level and found it lower than expected. I added oil as a precaution, but the condition did not improve and the vehicle became inoperable and required towing. The engine assembly remains intact and available for inspection upon request. This failure posed a serious safety risk, as the loss of engine function occurred without warning while the vehicle was in motion, creating the risk of stalling or loss of control. The vehicle was inspected by an authorized Hyundai dealership. Hyundai Motor America denied warranty and goodwill assistance, citing mileage and alleged insufficient maintenance documentation, despite the vehicle being within the 10-year powertrain period and despite the nature of the failure. Routine maintenance was performed throughout ownership; however, some historical service records are unavailable due to the age of the vehicle and changes in service locations over time. Multiple facilities no longer retain records from that period. Notably, no oil warning indicators never activated, which raises concern regarding the failure mechanism. Hyundai has acknowledged widespread engine issues in this engine family involving oil consumption, bearing failure, and sudden engine seizure. The symptoms and progression of this failure closely align with those known defect patterns. This complaint is submitted to document a sudden engine failure presenting a clear safety concern and to assist in identifying potential defect trends. This car has undergone previous engine repair, AC condenser and entire turbo by their service department previously 2022 & 2024 respectively.

- Bellmore, NY, USA

Car died/lost power while driving in traffic 11/28/25. Good Samaritan was kind enough to push me off the road out of traffic. Car was towed to Hyundai dealer that day, then 12/1 told engine failure, required engine replacement. Class action lawsuit settlement for engine replacement, but denied by Hyundai because of "neglect", since I am not able to locate all of the service records that they request. Known faulty rotating assembly, and Hyundai has implemented concerted practice of denying warranty coverage for failed engine. Now having to pay almost $8K to replace with new engine, but concern that new engine will have same issue. (multiple posts about this). There was high potential for significant traffic collision, injury due to sudden, catastrophic engine failure. Traumatic experience.

- Los Angeles, CA, USA

While driving on the highway at normal speed, the vehicle suddenly lost power and shut off without warning. There were no warning lights or messages prior to the loss of power. I was able to safely pull over, but the engine would not restart at that time and the vehicle required towing. The sudden engine shutdown occurred in active traffic and created a safety risk due to loss of propulsion. The vehicle later restarted, but I brought it to an authorized Hyundai dealership for inspection. The dealership diagnosed internal engine damage, including piston ring failure and cylinder wall scoring, and advised that the engine would need to be replaced. Since the incident, the vehicle has shown intermittent oil pressure warning lights and reduced performance. The issue has been confirmed by a dealer inspection. The vehicle is currently not considered reliable or safe for regular driving.

- Mankato, MN, USA

My motor has a knocking/tapping noise that is obnoxiously loud. My oil level is always changed on time every 3k miles. I have 146,257 miles on my vehicle. I was informed from my mechanic shop that many of the 1.6L motors have issues. I have never had an engine noise then boom its knocking. I was informed not to drive my car to further damage the vehicle. I do not drive it but now am stuck in a loan for a vehicle I cannot drive. I had zero warning for this matter.

- Norfolk, VA, USA

Vehicle is showing KSDS-related engine warning behavior and the Hyundai dealership performed a diagnostic scan. The service manager told me, -??I don-??t recommend you driving it, -?? due to a potential engine safety issue. However, Hyundai Motor America-??s National Consumer Affairs team is refusing to authorize towing or a loaner/rental until after a full diagnosis is completed. The dealership cannot complete the diagnosis unless the vehicle stays on-site, but I am unable to safely leave it because Hyundai is refusing transportation assistance and I was told not to drive it. This forces me to drive a vehicle they identified as unsafe in order to complete the required inspection. This involves KSDS/engine failure risk, which has been associated with stalling, loss of power, and possible fire hazards. Being advised not to drive while being denied towing or transportation creates a serious safety concern for myself and my children. I am requesting NHTSA document this incident because Hyundai is creating a safety hazard by refusing support for a vehicle they identified as unsafe to operate.

- Philadelphia, PA, USA

Part(s) Affected: Engine / Engine Control / Stall / Loss of Power Summary: My 2016 Hyundai Tucson (VIN: [XXX] ) has an active P1326 -?" Knock Sensor Detection System (KSDS) code, which indicates rod bearing wear and imminent engine failure. The vehicle experiences: -??loss of power -??inability to accelerate -??engine hesitation -??risk of stalling while driving These are serious safety risks. This issue is part of the Hyundai/Kia engine defect settlement XXX), yet Hyundai refuses to provide towing or address the safety risk despite the P1326 code being a known precursor to engine seizure. The vehicle is currently unsafe to drive, and Hyundai Customer Care has refused to escalate my case according to settlement requirements. This is a safety hazard that can cause engine seizure and sudden loss of power while driving. Details: -??Hyundai Case #: XXX -??Engine settlement code P1326 confirmed -??Hyundai refusing proper support -??Vehicle should not be driven NHTSA intervention is needed due to Hyundai-??s failure to address a known safety defect. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

- Philadelphia, PA, USA

Engine failure at 67k, Hyundai denied warranty

- East Norriton, PA, USA

Brought vehicle in on 07/10/25 to dealership with very low oil, it was determined vehicle was burning oil and combustion cleaning was recommended. Hyundai Corp. denied claim due to 2nd owner. We are not 2nd owner had to transfer title upon my father's death, vehicle owned by family. Hyundai then approved claim and combustion cleaning was done. We were then told by dealership to bring in vehicle every 1000 to check oil. On 2nd 1000 check it was determined to be burning oil and needed engine replacement. Hyundai Corp. denied claim this time stating gross maintenance neglect from 01/2018-06/2019 period but only 3084 miles were put on between oil change. This was not brought up during combustion denial. Also Hyundai stating out of warranty which expired 08/24/25 but issues started in 07/2025. I have asked Hyundai Case Manager to provide written proof in owner's manual where it shows we did not maintain vehicle in accordance to manual.

- Crystal Lake, IL, USA

My 2016 Hyundai Tucson has a severe engine defect that causes excessive oil consumption and poses a safety risk while driving. It constantly throws the P1326 engine issue, which is the knock sensor.The issue is not due to any misuse or neglect on my part. The vehicle consumes approximately one quart of oil per week, and I have been advised by two different Hyundai dealerships not to invest any money into repairs because the engine should be replaced under Hyundai-??s extended engine warranty (15 years/150,000 miles).Despite multiple attempts to get the issue resolved over the past year, Hyundai continues to deny the engine replacement, leaving me with no resolution and forcing me to drive an unsafe vehicle.The engine burns an excessive amount of oil and needs frequent refilling to prevent damage.The vehicle has stalled and runs rough at times, creating a safety concern.Both Hyundai dealerships I-??ve visited confirmed that this is a known issue and advised me not to spend money on repairs since the engine qualifies for replacement under the extended warranty.Hyundai corporate continues to deny coverage and has not repaired or replaced the engine despite the clear warranty terms.The issue has persisted for nearly a year, and the vehicle continues to deteriorate.I believe this defect poses a serious safety hazard because the engine can fail without warning while driving. The excessive oil consumption also increases the risk of engine seizure, stalling, or fire. I am currently forced to operate the vehicle in unsafe conditions due to Hyundai-??s inaction. I am requesting that NHTSA investigate this ongoing engine defect and Hyundai-??s repeated denial of warranty coverage for affected Tucson models. Owners should not be forced to drive unsafe vehicles or pay for repairs that should be covered under Hyundai-??s extended

- Wauconda, IL, USA

car often does not accelerate when hitting the gas. Was turning onto highway from a stop car did not accelerate causing other vehicle to swerve to avoid hitting me as my car would not move. Couple seconds later it moved

- Menomonie , WI, USA

Engine ran out of oil with no indication on instrument panel that it was happening. Engine now knocks and needs replacing. My independent service center has determined a failure. It is available for inspection.

- Epping, NH, USA