2018 Hyundai Tucson Cruise Control Problems

Van Hyundai Dealership in Carrollton, TX has confirmed excessive oil consumption causing catalytic converter failure that results in the engine stalling and unable to accelerate. We’ve already replaced the catalytic converter once in 2024 because it was full of oil and causing engine failure. Less than a year later (less than 10,500 miles) the same problem was reproduced.

The contact owns a 2018 Hyundai Tuscan. The contact stated that while her daughter was operating the vehicle, the check engine warning light illuminated, and the vehicle inadvertently decelerated to 30 MPH. The vehicle was taken to the local dealer and the contact was informed that the failure was due to a faulty sensor, which had malfunctioned when the oil change was due. The contact stated that the failure had occurred on several occasions when the oil change was due. The vehicle was not yet repaired. The manufacturer was not yet notified of the failure. The failure mileage was 30,000. The VIN was not available.

The car will jerk while driving. The problem was fixed last year and again it is happening now.Worse..the car while being driven will suddenly slow down inspite stepping more on the gas pedal.

Knock sensor recall was done in May 2022. Brought vehicle into service for Ac problem and oil change, which was completed. Was on highway going home 65 mph speed limit hit a hill, my engine light started flashing, my transmission downshifted and I lost all accelaration while on hill, speed wouldn’t go any higher then 50 at that point. Got to closest gas station and had car towed back to dealership, I just want to point out that the knock sensor is going to put people in danger in certain situations like myself, I am not to happy.

The contact owns a 2018 Hyundai Tucson. The contact stated that while driving up a hill, the vehicle lost motive power. While driving the vehicle at undisclosed speeds and turning, the vehicle hesitated and then accelerated. There were no warning lights illuminated. The vehicle was taken to the local dealer where however, the mechanic was unable to duplicate the failure. The vehicle was not diagnosed. The manufacturer was not contacted. The failure mileage was approximately 100,000.

TL* THE CONTACT OWNS A 2018 HYUNDAI TUCSON. ON SEVERAL OCCASIONS, WHILE DRIVING APPROXIMATELY 1 MPH AND ATTEMPTING TO MAKE A LEFT TURN, THE ACCELERATOR PEDAL WAS DEPRESSED; HOWEVER, THE VEHICLE FAILED TO RESPOND. THE CONTACT STATED THAT THE ACCELERATOR PEDAL WAS PUMPED 5-6 TIMES BEFORE THE VEHICLE RESPONDED. THE VEHICLE WAS TAKEN TO FAULKNER HYUNDAI (11500 ROOSEVELT BLVD, PHILADELPHIA, PA 19116, (215) 673-7462) TO BE DIAGNOSED AND THE CONTACT WAS INFORMED THAT THE VEHICLE PERFORMED AS INTENDED. THE VEHICLE WAS NOT REPAIRED. THE FAILURE RECURRED THREE TIMES. THE CONTACT STATED THAT THE FAILURE ONLY OCCURRED DURING LEFT TURNS. THE MANUFACTURER WAS NOT NOTIFIED OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 300.

ONCE MY BRAND NEW TUCSON HIT 500 MILES ON IT, IT SUDDENLY UNINTENTIONALLY ACCELERATES WHILE MY FOOT IS ALREADY PRESSING FIRMLY ON THE BREAK PEDAL. THE FIRST TIME, IT HAPPENED AS I WAS APPROACHING THE PEAK OF A HILL. I WAS GOING 25 MPH. MY FOOT WAS ALREADY PRESSING ON THE BREAKS, ANTICIPATING THE DECLINE, WHEN MY CAR JOLTED FORWARD AND TOOK OFF. MY FOOT SLAMMED ON THE BREAKS EVEN HARDER, HOWEVER I WATCHED MY SPEEDOMETER HIT 40 MPH WHILE SIMALTANEOUSLY, MY RPM DECREASED TO 1... (YES, DOWN A HILL.) FOR ABOUT 5-7 SECONDS THE RPM AND SEPPDOMETER WOULD NOT INCREASE OR DECREASE ONCE HITTING 40 MPH AND 1 RPM. I HAD TO LEAN OVER THE WHEEL AND SLAM MY BREAKS TO THE FLOOR BEFORE I REGAINED CONTROL OF THE VEHICLE. ONCE THIS OCCURRED, THE CAR LAGGED, STRUGGLING TO ACCELERATE THROUGHOUT THE REMAINDER OF THE DRIVE (ALL FLAT ROADS). IT IS NOW DAY 5 OF EXPERIENCING THIS, AND IT NOW OCCURS MULTIPLE TIMES EVERY TIME THE VEHICLE IS IN MOTION, WHETHER BREAKS ARE BEING APPLIED PRIOR, OR NOT, REGARDLESS OF THE TYPE OF ROAD I AM ON (FLAT, HILL ETC.) I WAS EXITING A PARKING GARAGE THAT HAD A MEDIOCRE RAMP TO EXIT THE GARAGE. MY VEHICLE WAS GOING 12 MPH WHEN I TURNED RIGHT TO PROCEED DOWN THE RAMP. MY FOOT SLOWLY PRESSED THE BREAK PEDAL, AND MY VEHICLE ACCELERATED TO 28 MPH, AND MAINTAINED THAT SPEED FOR 3 SECONDS, BEFORE RESPONDING TO MY BREAKS. YES, MY FOOT HAD THE BREAKS PRESSED ALL THE WAY DOWN. ANOTHER EXAMPLE, YESTERDAY I WAS ON A FLAT ROAD DRIVING AT 27 MPH WHEN IT SUDDENLY ACCELERATED TO 45 MPH, AND THE RPM DROPPING SUDDENLY FROM 2, TO 1. AFTER A FEW SECONDS OF MY FOOT SLAMMED ON THE BREAKS I REGAINED CONTROL AND PULLED THE CAR OVER. I TURNED THE ENGINE OFF AND WAITED ABOUT 5 MINUTES. WHEN I TURNED IT BACK ON, AND BEGAN DRIVING (3 MINUTES LEFT IN MY DRIVE), THE CAR CONTINUED TO LAG, LUNGE FORWARD, AND COULD NOT REACH SPEEDS HIGHER THAN 30 MPH. THIS CAR IS BRAND NEW.

THE VEHICLE IS EXPERIENCING SEVERE INTERMITTENT FAILURES TO ACCELERATE. FAILURES OCCURR FROM A STOP AND WHILE IN MOTION. ALL GEAR LEVELS APPEAR TO BE AFFECTED. FAILURES WERE FIRST NOTICED AT APPROXIMATELY 7000 MILES.