The contact owns a 2017 Hyundai Tucson. The contact stated that while driving at various speeds or accelerating from idle, there was a knocking sound coming from the engine. While accelerating from idle, the vehicle failed to exceed 30 MPH, requiring that the driver slowly accelerate and gradually increase the speed. No warning lights were illuminated. The vehicle was taken to a certified mechanic who diagnosed the vehicle with transmission failure. The mechanic replaced the brakes and tires. The vehicle was then taken to the dealer, who diagnosed failures with the muffler assembly and catalytic converter related to the failure to accelerate. The failure persisted, and the vehicle was returned to the dealer, who confirmed the noises coming from the engine while the accelerator pedal was depressed, with a burning odor, and oil issues. After five visits to the dealer, an oil leak from the drain plug was determined. The drain plug and oil pan were replaced a year and six months later. The vehicle continued to fail to accelerate properly, making it difficult to drive uphill. The vehicle was taken to another dealer, Niagara Hyundai of Grand Island (1910 Alvin Rd, Grand Island, NY 14072), who confirmed that the vehicle was not safe to drive. The catalytic converter was replaced again but the failure persisted, and there was no engine oil in the vehicle. While driving 65 MPH, the vehicle started shaking. The contact pulled over to the side of the road and waited approximately 10-?"15 minutes before continuing to drive at 50 MPH. The contact inspected the vehicle and noticed that the engine was hot. The vehicle was towed back to the second dealer, who performed an oil consumption test requiring the contact to drive 1,000 miles. The test determined the engine oil level was extremely low. The dealer suggested a chamber cleaning, but the request was still pending. The manufacturer was made aware of the failure and opened a case. The failure mileage was approximately 63,000.

- Tonawanda, NY, USA

The contact owns a 2017 Hyundai Tucson. The contact stated that while attempting to accelerate, the transmission failed. There were no warning lights illuminated. The vehicle was taken to the local dealer, where it was diagnosed and determined that the transmission needed to be replaced. The vehicle was repaired, but the failure reoccurred. The contact stated that while driving approximately 25-30 MPH, the vehicle was making an abnormal rattling and knocking sound that was coming from the engine while accelerating. The transmission was shaking continuously while driving at 10 MPH. The vehicle was taken to the local dealer, where it was diagnosed with camshaft and engine failure and needed a cam finish over an advanced timing system overhaul. The contact was informed that the camshaft, CVT, timing chain and tensioner, front valve cover and valve cover gasket, turbocharger, turbocharger gasket, and turbocharger lines needed to be replaced. The vehicle was not repaired. The manufacturer was contacted, but no assistance was provided. The failure mileage was approximately 92,000.

- Concord, CA, USA

The contact owns a 2017 Hyundai Tucson. The contact stated that while driving at various speeds, the vehicle made an abnormal clacking sound. The vehicle was taken to an independent certified mechanic, where it was diagnosed that the catalytic converter had failed and needed to be replaced. The vehicle was repaired; however, the failure persisted. The vehicle was taken back to the mechanic, where the catalytic converter repair was performed. The contact stated that after the repair, the contact noticed that the instrument panel would turn black and the infotainment system would become inoperable intermittently; however, both systems would reboot independently. Additionally, the vehicle was taken to an unknown dealer, where the air compressor was replaced due to heating system failure. The contact stated that the instrument panel failure recurred intermittently. Additionally, the contact stated that the vehicle was overheating. The check engine warning light was illuminated and the message "Engine Overheating" was displayed. The vehicle was taken back to the independent mechanic, where it was diagnosed with engine misfire. The mechanic determined that the head gasket failure had caused oil to contaminate the coolant reservoir. The vehicle was not repaired. The dealer was contacted and confirmed that the VIN was not included in a recall. The manufacturer was not notified of the failure. The failure mileage was unknown.

- Albany, GA, USA

See attached document for complaint.

- Sarasota, FL, USA

The contact owns a 2017 Hyundai Tucson. The contact stated that the vehicle was consuming an excessive amount of engine oil. The contact was topping off the oil weekly. The failure had become more persistent. While driving 65 MPH, the vehicle started shaking and was making a knocking sound at the front-end by the engine compartment. The check engine warning light was flashing. The contact coasted to the side of the road and checked the oil level. The oil level was low, and the contact added oil to the vehicle. The contact restarted the vehicle, and the vehicle began shaking, making a knocking sound from the front end, and there was white smoke coming from underneath the hood of the vehicle. The vehicle was turned off, the smoke ceased, and the vehicle was left parked in the parking lot at work. The dealer was not contacted. The manufacturer was not informed of the failure. The failure mileage was 100,000.

- Newburgh, NY, USA

See attached document for complaint.

- North Aurora, IL, USA

The contact owns a 2017 Hyundai Tucson. The contact stated that while at a complete stop, the vehicle hesitated and sputtered upon the depression of the accelerator pedal. Upon inspection of the engine compartment, the contact discovered that the oil level was low. The vehicle was taken to a dealer where the contact was initially informed that the failure was normal with similar vehicles. The contact stated that the failure persisted, and the vehicle failed to start with the oil warning light illuminated. The contact checked the oil level, and the oil was full. The vehicle eventually started with the check engine and air bag warning lights illuminated. The vehicle was taken back to the dealer where the vehicle was diagnosed with engine failure. The manufacturer was notified of the failure. The vehicle was not repaired. The failure mileage was approximately 120,000.

- Cincinnati, OH, USA

The contact owns a 2017 Hyundai Tucson. The contact stated while driving at an undisclosed speed, there was a loud knocking sound coming from the engine, and the contact was unable to keep driving the vehicle. The contact was able to pull the vehicle to the side of the road. The vehicle was towed to the residence and then to a local dealer where the failure was related to an engine malfunction and oil leaking. The contact was advised that the engine needed to be replaced. The contact stated that the transmission was previously replaced twice. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 112,000.

- Sandston, VA, USA

The contact owns a 2017 Hyundai Tucson. The contact stated that heavy, black smoke would emit from the tailpipe upon the start of the vehicle without warning. Upon inspection of the vehicle, the contact discovered that the oil level was low. The vehicle was taken to a dealer where a diagnostic test was performed, and the diagnostic test showed that the vehicle was consuming excessive amounts of engine oil. The contact was informed to bring the vehicle back to the dealer every 1,000 miles to track the oil consumption. The oil gasket, oil filter, and oil pan were replaced; however, the failure persisted. The manufacturer was notified of the failure and referred the contact back to the dealer. The vehicle was not repaired. The failure mileage was approximately 70,000

- Fort Lauderdale, FL, USA

The contact owns a 2017 Hyundai Tucson. The contact stated the vehicle was taken to an independent mechanic for a scheduled oil change, and the contact was informed that the oil level was extremely low. The oil light was illuminated. The contact took the vehicle to the dealer for an oil consumption test. The vehicle was checked after 1,000 miles and failed the consumption test. The vehicle was not repaired, and the failure persisted. The manufacturer was notified of the failure but offered no assistance. The failure mileage was approximately 95,000.

- Ypsilanti, MI, USA

Not to long after I purchased the car I have to put oil in the car every 4 to 5 weeks.Sometimes the motor sounds like it-??s going to blow.The car slows down and sounds loud.Never once has a oil light turned on.When I checked the oil it doesn-??t appear on the stick.

- Pomona, CA, USA

The contact owns a 2017 Hyundai Tucson. The contact stated that while driving at an unknown speed, an abnormal knocking sound started with the check engine warning light was illuminated. The vehicle was taken to an independent mechanic and the contact was informed that the oil level was extremely low. The vehicle was taken to the dealer to service recall NHTSA Campaign Number: 21V727000 (Engine); however, the recall was not related to the failure. The manufacturer was notified of the failure. The vehicle was repaired. The failure mileage was approximately 63,000. The consumer stated that the vehicle was not repaired. The issue still persists, and the oil light never comes on. An oil consumption test from the mechanic was requested and the vehicle is to be checked after 1000 miles. Unfortunately, the oil only lasts approximately 400-600 miles before the engine starts knocking.

- Worcester, MA, USA

The contact owns a 2017 Hyundai Tucson. The contact stated that while operating the vehicle there was a knocking sound coming from the engine compartment. While inspecting the vehicle it was discovered that the engine oil was extremely low, even though the oil had been recently changed. The vehicle was taken to the local dealer who initiated an oil consumption test. No further information was available. The manufacturer was notified of the failure. The failure mileage was 75,000.

- Alexandria, VA, USA