2019 Hyundai Tucson Speed Control & Cruise Problems

The vehicle was brought in just after a month of owning it due to it was accelerating slow and driving bad salesmans sent it to Hyundai dealership for diagnosis and it came back that the motor needed to be replaced due to recall vehicle was in repair shop for over 3 months to get a new motor once returned the very next day the check engine light came back on so I brung it back to the Hyundai dealership per Hub City's salesmans instruction to have vehicle diagnosis again. Hyundai advised that the vehicle needed a catalyst converter among other codes detected on vehicle.

On 05/11/2024, I accelerated onto the freeway at which point my vehicle would no longer go past 50 mph with the pedal to the floor. I had my two small children in the car at the time. It was dangerous as cars around us were going 65+ mph. The check engine light started blinking when this was occurring. Prior to that the check engine light had been on because the dealership claimed they didn’t know why it was triggering and that they have to take my engine out and replace it just to explore the issue. I don’t have the money for that. It has a knocking sound, a pungent fuel smell and it still won’t accelerate. I only have 85k miles on the car.

Almost got killed!!! This car is dangerous!!! I feel lucky I can still write to you. Hyundai 2019 Tucson (TL) 2.0L has been plagued by a recall and related known defects that create dangerous and life-threatening situations on the highways 3 times in 10 months for us!!! Vehicle year, make & model: Hyundai 2019 Tucson (TL) 2.0L car Approximate mileage: Current ~37,000 How many repairs visits to the dealer? total 4 (First time was Hyundai recall, 3 times Check engineer light flash on interstate highway and the car went to limp mode and reduced speed drastically) A short description of the problem: Car has been plagued by a recall and related known defects that create dangerous and life-threatening situations on highway. 1). Recall on [XXX] (with only 19395 miles on it); 2). [XXX]. The car only had 22036 miles on it, on [XXX] near San Francisco; 3). [XXX] while driving on [XXX] north of Portland; 4). [XXX] during the afternoon pre rush hour traffic before 3:00 PM on highway [XXX] near Tigard (currently undergoing road construction with no shoulder, and many cars driving at high speed) Almost hit by a car behind me. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The contact owns a 2019 Hyundai Tucson. The contact stated that while his wife was driving at low speeds, pulling into a parking spot on an incline, the vehicle accelerated and failed to stop. Then the vehicle traveled through several 15-gallon pots with trees, a patio, elliptical machines, and a wooden fence. The driver veered to the left, went down a mountain approximately 30 feet, continued down the hill, and crashed into a pine tree where it came to a halt. The occupant in the front passenger seat sustained a concussion. The driver sustained injuries to her lip and medical attention was provided. There were no warning lights illuminated. The vehicle was towed to the police station. A police report was filed. There was no reported fire. The driver's side front and passenger side front air bags were deployed. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was contacted, who provided claim number 21135585, and had the vehicle inspected but indicated the brake pedal had not been depressed but no additional assistance was provided. The failure mileage was approximately 27,000.

I have been experiencing serious safety issues with the 2019 Hyundai Tucson I purchased that have been ongoing since February of 2023. The check engine light comes on, begins to flash, and the car goes into 'limp mode' and will not allow me to accelerate faster than 45/50 mph. Consequently, it will further stall on hills due to the inability to accelerate. Below is a brief timeline of this incident: - February 21: Bring in vehicle to dealer as recommended for oil change, tire rotation, cabin air filter, and a recall. The recall issue was as follows: 966 engine monitoring logic, 22-01-028H-1, caused by ecm update, 966 campaign, ecm update op code 10d021r9.3 - February: 24: Check engine light comes on, flashing, and unable to accelerate past 45-50 mph. - February 27: Return to dealer and bring in vehicle for check engine/no acceleration issue. - March 2: Pick up vehicle from dealer - March 8: Check engine light comes on again, flashing, and unable to accelerate past 45-50 mph. - March 9: Return to dealer and bring in vehicle for check engine/no acceleration issue. - April 5: Pick up vehicle from dealer - April 8: Check engine light comes on again, flashing, and unable to accelerate past 45-50 mph. - April 10: Return to dealer and bring in vehicle for check engine/no acceleration issue - April 25: Pick up vehicle from dealer - May 3: Check engine light comes on again, flashing, and unable to accelerate past 45-50 mph. - May 4: Return to dealer and bring in vehicle for check engine/no acceleration issue; car is still at dealer as of May 25

The component involved is the engine and associated knock detection system (KSDS). The system triggered a P1326 code indicating abnormal engine knock associated with a known defect condition. On February 14, 2023, while driving on the freeway, the vehicle suddenly entered reduced power (“limp mode”) and lost acceleration capability in active traffic. This created a safety risk, as the vehicle was unable to maintain speed with surrounding traffic or accelerate as needed for normal driving conditions. There were no sufficient warnings prior to the event to allow safe planning or avoidance of the loss of power condition. The system activation itself (P1326 and limp mode) was the first indication of the severity of the issue. The problem has been reproduced multiple times, with repeated P1326 events occurring after the initial incident. The condition has been inspected and partially confirmed by a Hyundai dealership. In March 2026, dealership records documented that oil contamination was causing catalytic converter failure, indicating ongoing engine-related deterioration consistent with the defect condition identified by the knock detection system. Despite these findings, the underlying engine condition has not been resolved. The KSDS system is designed to detect a potentially serious engine defect and limit engine power to prevent further damage. However, it does not correct the underlying defect. As a result, the vehicle may continue to operate with a known compromised condition that can trigger reduced power unexpectedly. This creates an ongoing safety concern. A vehicle that can suddenly lose acceleration due to a known defect presents a risk to the driver, passengers, and other motorists, particularly during freeway driving, merging, or other situations requiring normal engine performance. The vehicle remains available for inspection upon request.

The contact owns a 2019 Hyundai Tucson. The contact stated that while driving at an undisclosed speed, the vehicle hesitated to accelerate while the engine revved loudly. The vehicle then jerked forward while driving. Additionally, there was an abnormal rubber odor detected. The vehicle was taken to the dealer; however, the dealer was unable to duplicate the failure. The failure recurred, and the vehicle was taken back to the dealer, where it remained unrepaired. The manufacturer was made aware of the failure and a case was opened. The failure mileage was 10,724.

The contact owns a 2019 Hyundai Tucson. The contact stated that the vehicle was consuming oil. The contact stated while her daughter was driving approximately 40 MPH, the RPM increased from 2,000 to 3,000 RPM. There was no warning light illuminated. The vehicle was taken to the local dealer where they were unable to duplicate the failure. The vehicle was not diagnosed or repaired. The vehicle was taken back to the local dealer and diagnosed that an oil change was needed, and the PCV valve needed to be replaced. The vehicle was repaired however, the failure recurred. Additionally, while her daughter was driving the vehicle hesitated and failed to accelerate. The vehicle was taken back to the local dealer and it was determined that an oil consumption test needed to be performed. The manufacturer was notified however, no further assistance was provided. The failure mileage was approximately 41,580.

2019 HYUNDAI A TUCSON WAS STOPPED IN DRIVEWAY WITH AUTO HOLD ON WHILE SPEAKING WITH AN INDEPENDENT WITNESS. FEET WERE NOT TOUCHING ANY PEDALS AND AUTO HOLD WAS ENGAGED WITH VERIFICATION ON DASH. VEHICLE SUDDENLY ACCELERATED DOWN DRIVEWAY AND INTO STREET TRAVELING TOWARDS MAILBOX ACROSS STREET. WAS ABLE TO APPLY BRAKES WITH A LOT OF PRESSURE AND STOPPED VEHICLE. VEHICLES RPM'S AND SPEED WENT UP LIKE PRESSING HARD ON GAS PEDAL. VEHICLE HAS 1800 MILES

DRIVING FROM LIBERTY,MO. TO CHICAGO, SMART CRUISE CONTROL SET AT 70-75 MPH, VERY LITTLE TRAFFIC, AFTER AROUND 2 1/2 HOURS OF DRIVING ,ABOUT 40 MILES FROM HANNIBAL,MO. CAR ACCELERATED TO 90 MPH BY ITSELF. VEHICLE CRUISE CONTROL WOULD NOT SHUT OFF BY CRUISE BUTTON, CANCEL BUTTON, OR BRAKE. GOT OFF AT FIRST RAMP WITH CAR RUNNING AT 90 MPH BY BRAKING HARD. PULLED OVER AND PUT CAR IN PARK. MOTOR SURGING AT HIGH RPM, WOULD NOT STOP RUNNING UP AND DOWN. CRUISE INDICATOR LIGHTS OFF. SHUT OFF ENGINE. CALLED BLUE LINK, REFERRED TO NEAREST DEALER, NO CODES SHOWING ON CAR. AFTER HALF HOUR RESTART CAR, NO PROBLEMS. CHECKED FLOOR MATS AND REMOVED. ON RETURN TRIP AROUND 2 1/2 HOURS FROM START AT AROUND 70-75MPH SETTING, THE CAR ACCELERATED TO 90MPH BY ITSELF, WITH THE SMART CRUISE CONTROL ON, NO TRAFFIC, NO FLOOR MATS, AND TURNED CRUISE CONTROL OFF,CRUISE BUTTON, CANCEL BUTTON, BRAKE, BUT ENGINE KEPT RUNNING AT 90 MPH. BRAKED HARD, PULLED OVER, ENGINE SURGING IN PARK. SHUT OFF, WAITED 1/2 HOUR, NO FURTHER PROBLEM ON WAY HOME. DEALERSHIP COULDN'T FIND ANY CODES OR ENGINE OR CRUISE CONTROL PROBLEMS. NOTED MATS IN CAR, DIDN'T COMMENT WHEN WHEN STATED THEY WERE INFORMED MATS OUT OF CAR WHEN SECOND OCCURRENCE.