2019 Hyundai Tucson Driver assistance Problems

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.

NHTSA ID

11730664

Incident

Feb 14, 2023

My 2019 Hyundai Tuscan has been burning oil and the oil has to be topped off every 1,000 miles or so. There are multiple check engine lights illuminated: abs, front collision, traction. These lights have flashed off and on for 3 years but are not light up solid. This sounds like an issue.

NHTSA ID

11711137

Incident

Oct 22, 2025

My 2019 Hyundai Tucson, VIN [XXX] , has developed engine knocking, which may indicate internal engine failure. A mechanic has suggested a possible loss of cylinder compression, though the exact cause has not been confirmed. Hyundai vehicles from similar model years have experienced engine failures related to bearing wear and metal debris, leading to stalling, loss of power, and complete engine failure. These failures present a serious safety risk, particularly if the engine fails while driving. I am concerned that this defect could result in sudden loss of power or engine seizure, increasing the risk of an accident. I am submitting this complaint to ensure the issue is properly investigated and addressed. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ID

11705929

Incident

Nov 27, 2025

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.

NHTSA ID

11680676

Incident

Feb 24, 2025

I have been having a number of things happen; 1- my car will lurch forward at times when I release the brake and hit the gas pedal. 2- the forward collision warning keeps coming on. 3- My heating and oil cooler hoses leaking as well as metal lines, all started to leak at the same time.

NHTSA ID

11653785

Incident

Apr 6, 2025

Unknown

NHTSA ID

11635378

Incident

Dec 6, 2024

The contact owned a 2019 Hyundai Tucson. The contact stated while driving 45 MPH, the Forward Collision Avoidance warning light illuminated. The contact stated that the vehicle automatically brake, independently without the brake pedal being depressed. The vehicle was taken to an independent mechanic where several codes were illuminated and advised the contact to take vehicle to the local dealer. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was 16,803.

NHTSA ID

11628339

Incident

Oct 2, 2024

Mileage

16,803 mi

’ve replaced the catalytic converter two times , the check engine light is on so it says I need another catalytic converter, that was in June 2024. The car was at the shop yesterday, needs catalytic converter and oil is pooling all throughout the car , fumes from the exhaust are coming back into the car which makes me physically ill. The engine revs and slows down by itself, it goes through oil on such a regular basis that I have to carry a full size jug of oil with me at all times because I need to put it in before I leave work and when I am on my way back home , the dipstick will be dry.

NHTSA ID

11606361

Incident

Jun 4, 2024

The TSB needs to be replaced according to the Hyundai Dealership. This is a known problem and would normally be covered under warranty but I am just outside of my warranty window and it just started happening. The entire audio system, touch screen controls, and hands-free controls do not work. The touch screen freezes after a few seconds and freezes on my backup camera creating a major driving distraction. The audio system does not shut of once the vehicle has been turned off creating a problem for the battery which I have to manually disconnect or it will continue to power my touchscreen system even after I leave the vehicle. The lane assist, blind spot indicator, and any beeping warning sounds do not work because of the failing TSB. I cannot change my cars settings or hear any warnings from the car's sensors. I believe this is a major manufacturing flaw and Hyundai will not fix it even though those warning sounds are part of the safety features of the vehicle and are a major player in driver safety. The radio controls do not work - volume included. I cannot adjust any noises in the car and beeping warnings are no longer sounding. I am worried that this problem is also affecting any and all car audio warnings such as the forward collision warning, parking collision warning, and lane departure warning.

NHTSA ID

11598013

Incident

Jun 24, 2024

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.

NHTSA ID

11591436

Incident

May 11, 2024

Check engine light comes on it has come more then 5 times. I take it to the dealership. They tell me they are doing an oil consumption test this makes the 5th one. Lane assist when trying to move away from a vehicle it pulls back almost getting you into an accident.

NHTSA ID

11586802

Incident

Apr 26, 2024

I believe that this car is a lemon. Ever since we bought it we have problems with the engine not performing right. I have got the engine system cleaned multiple times one at the dealership and one at Valvoline Oil Change facility. The engine still didn't run smooth. I would always get the oil changed on time and the vehicle has never been in a accident. Now just yesterday the vehicle while driving on the highway just stalled and wouldn't accelerate past 60mph. Now the check engine light is blinking and all of the lights on the dash are on. Also lately sometimes the forward collision lights will come on and other warning lights and sometimes they wont. Another light that intermittently comes on are the auto hold and epb light and this has been happening since we bought the vehicle. I have taken into Hyundai and they basically were like yea sometimes that happens. I have not gotten the new check engine light checked but I am sure that it is something serious because the car won't accelerate past 60mph. I have read on other discussions that there are many problems with Hyundai engines and believe that I am victim to very poor quality manufacturing in this engine. I also have a 2013 Toyota Camry with 180,000 miles and haven't had one problem with it. This car is a lemon and would like to have some help with this please. I have also made a complaint with Hyundai under their drive train warranty.

NHTSA ID

11580406

Incident

Feb 16, 2021

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)

NHTSA ID

11579429

Incident

Feb 12, 2024

I have a Hyundai Tuscon 2019, which was pre-certified by Hyundai. This particular car was part of a lawsuit because of a knock sensor issue. The lawsuit information is here: [XXX] The knock sensor failing is not really what causes the safety issue. The engine symptoms when the sensor fails is the issue. The engine goes into "safety mode" which limits the car to a significant slower speed. The problem is that Hyundai has now tried to fix this issue twice on my vehicle, and the knock sensor continues to fail. To be clear, they've replaced the sensor twice. Based on the lawsuit, the court mandated them to fix the knock sensor. They have done that free of charge, but the sensor continues to fail. To me this sounds like a manufacture issue. It is incredibly dangerous when you're on a highway and the sensor fails. It happened to me, and it was almost catastrophic. The car slowed down and there is nothing you can do about it. I noticed there was something wrong very quickly and put my hazards on. If I didn't, I may not be writing you here. You could easily get into a significant accident, and from that could lead to injury or loss of life. I am asking for a review of this. I have my service records as well as recorded conversations with Hyundai corporate regarding this issue. Service records are attached. I live very close to NHTSA HQ and willing to come in if necessary. To me, this is concerning enough for that.. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ID

11578977

Incident

Mar 4, 2024

My truck keeps showing lights and is displaying that the crash collision is disabled.

NHTSA ID

11571598

Incident

Feb 12, 2024

At approximately 69000 miles my engine stalled as I was pulling onto a highway and would not accelerate beyond a low mph. I turned back into gas station I had left and checked the oil. It did not register any oil and had a burning smell. There were never any dash lights indicating low oil. I put almost 2 quarts in vehicle. I then proceeded to drive as it seemed okay. I have had oil changes where the technicians have told me I was low on oil even though it was a normal time frame for oil change. I recently checked my oil just right as my oil change is due and the oil level did not register, nor were there any low oil indicators on dash. I had to add a quart of oil. This poses a hazard/safety problem. If not checked more often than normal, oil could go low and stall again. If pulling into a busy traffic area and a stall occurs, there could be an accident etc not to mention damage to the motor/engine itself. I have to frequently check the oil levels which should not have to happen for a vehicle with 70k+ miles.

NHTSA ID

11524229

Incident

Mar 31, 2023

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

NHTSA ID

11523832

Incident

Feb 24, 2023

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.

NHTSA ID

11522591

Incident

Mar 7, 2023

Mileage

27,000 mi

Vehicle engine light has been on for months, it would come and go. I’ve taken it to Hyundai but they kept saying nothing comes up and maybe it was the gas cap needing to be changed. My car also burns oil TOO fast and the dealership has expressed concern. I’ve also been getting a front collision camera disabled message on the dashboard for the last two days. On 3/23/23, my Tucson not only start making a loud noise but the engine light is blinking and barely drives. I almost didn’t make it home safely or at all

NHTSA ID

11513531

Incident

Mar 23, 2023

FEEL LIKE THE EMEGENCY BRAKE IS GETTING STUCK BUT THE DEALER TELLS ME IM WRONG BUT THEY NEVER TEST DROVE IT

NHTSA ID

11507975

Incident

Feb 1, 2023

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.

NHTSA ID

11501230

Incident

Sep 29, 2022

Mileage

10,724 mi

I was merging onto a highway at high speeds when the car stuttered. The check engine light began to flash and I lost acceleration. I could push the gas pedal to the floor and the car would not accelerate at all. The car lost it's speed and I could not go anymore than 30mph, and it would not go higher than 2rpms. It put me and my baby (who was in the backseat) in danger as we were going fast on a highway and out of nowhere the car lost speed and I could not accelerate. I could've easily been hit by another driver going the regular speed limit. I drove it to the dealership that just happened to be down the street, and the car struggled to accelerate from a complete stop, as well as in general. From a complete stop, the car would sputter and jerk when pressing on the gas pedal. The dealership diagnosed it as a faulty Knock Sensor. They said they would replace the sensor as it was still under warrenty. When I left the dealership, the check engine light was off and the car was driving fine. Fast forward to the next day, I was driving again on a highway at about 65mph, when the SAME thing happens. The car stuttered, lost all acceleration, and the check engine light was flashing. I ended up driving it home (about 10 miles away) and the whole time I could not go faster than 30mph without the car shaking. This time the car would not go higher than 1.5rpms. I checked the engine at home and a P1326 code came up, which is a code for the Knock Sensor. I called the Hyundai dealership that I originally went to and they said there was nothing they can do about it at the moment since they had just replaced it. Prior to all of this, there was no warning sign at all that this was a potential hazard. It happened so suddenly and both times it happened put me in a dangerous situation.

NHTSA ID

11492656

Incident

Nov 5, 2022

While on the road, the 2019 Hyundai Tucson Value dashboard warning lights lit up and stated to check the Lane Keeping Assist and the Forward Collision Assist. The engine light, anti-skid light and power steering light came on as well as the car began to decelerate while in the middle of traffic. I pulled over and turned the car off. When trying to turn back on, the car would not start again until I began pumping the gas with my foot for a few seconds then it started; however, now the engine light was on although it drove normally after that. This has happened to me a few times now, but is very scary because it gives no warning and when I take it to the dealership they can never find anything wrong with it.

NHTSA ID

11486383

Incident

Sep 26, 2022

Blind spot warning becomes disabled sporadically? Engine needs to be turned off and restarted to reconnect Blind Spot Warning. This has been an ongoing problem for the last few years. It never shows up when brought into dealer for inspection? Nor are there any computerized “messages” in the system? The below “Additional Details” only reflect yesterday’s occurrence. This problem happens on a regular basis. with no regularity?

NHTSA ID

11451103

Incident

Feb 9, 2022

While driving down a busy road at 10:00 pm on New Years Eve, my vehicle's engine completely shut off. Immediately prior to the shut off, the vehicle's dash displayed the oil and battery lights. The vehicle's automatic emergency brake and steering wheel lock were both engaged, not allowing me (or the tow truck company) to move my vehicle out of this busy road. My car remained in this location for 3 and a half hours. The hazard lights stopped working after the first hour, making it extremely difficult to see that the vehicle was stopped. After the second hour, an officer parked behind my vehicle with their lights flashing as he said it was an extremely dangerous situation and my car was sure to be hit. He was able to get a tow truck to me before Hyundai. For hours, numerous people were forced to brake quickly/swerve into other lane to avoid hitting my car. This occurred right before an intersection, putting 4 directions of drivers at risk of collision. I stood in the rain, near my car, attempting to help direct drivers away from the lane until the police officer showed up. The vehicle is now at the dealership which confirmed engine failure, pending replacement. Possibly related, this vehicle had the catalytic convertor replaced 3 months prior. It is not yet confirmed if this contributed to the engine failure.

NHTSA ID

11446347

Incident

Dec 31, 2021