Engine And Engine Cooling Problems of Hyundai Tucson - part 1

Excessive oil consumption. Mileage is 116. 7k miles. Over 4 quarts used in approximately 3,500 miles. Car went into "limp" mode with no power. Top speed on level ground was 45 mph, on a hill 25 mph. Had to pull over to the side of the road so that other cars could pass. Drove to mechanic who saw about 1 quart remained in the car. Oil light didn't go on. Service engine light flashed when the car went into "limp" mode.

See all problems of the 2016 Hyundai Tucson 🔎.

Warning lamp included oil for several months prior. I added oil often. No oil was ever seen under car or leaking in any way. Car had been serviced several times during the oil warning lamp warning. Nothing was ever found. I continued adding oil on a regular basis. Engine completely stopped in the middle of a busy street.

See all problems of the 2015 Hyundai Tucson 🔎.

I have had 2 catalytic converters the original and a 2nd one. Now I need a 3rd due to excessive oil consumption. Corporate did a good will for a combustion cleaning and that did nothing. The dealership checked my oil and said there was excessive oil consumption and submitted for an engine replacement and it was rejected. Absolutely ridiculous.

See all problems of the 2019 Hyundai Tucson 🔎.

While driving on the highway 65 mph in our 2019 Hyundai Tucson awd, the vehicle suddenly experienced a severe power loss, loud engine knocking, engine light flashing, and the car in limp mode. This caused a terrifying hazard. We exited to safety, the car was towed and is at a Hyundai dealership. It pulled a diagnostic engine trouble code p1326 (knock sensor detection system). The dealership confirmed the code, but is refusing to replace the engine under the Hyundai engine ii class action settlement without an out-of-pocket 'combustion cleaning' fee, which, as seniors, we cannot afford on a fixed income. The dealership service manager told us that he requested goodwill from Hyundai corporate for the combustion engine cleaning. And because of a past denial, corporate denied it a 2nd time. So, we contacted our Hyundai corporate case manager, who said our request for “the engine replacement” was still pending and in review by their team. She saw no denials, except for a loaner, which would be approved, upon repair approval. We added the dealership service manager on this call to discuss confusion about goodwill be denied by corporate for the “combustion cleaning”. He said this case manager would not see the combustion cleaning requirement, because it was instructed by another department. His then pivoted the topic & said we received an estimate for combustion cleaning. My response “we never received an estimate & have no estimate in my email”. His response “I hate to use this word, but you’re a liar”. My husband then took the call saying “we did not receive an estimate in writing, although we had asked the tech for an estimate but nothing was final. ” the service manager cut him off and said “we are done come pick up your car” & hung up. This dealership phone interaction needed to be included in this incident because now we are being put in grave danger as he is expecting us to pick up our un-drivable, unsafe & hazardous car with no concern for safety.

While driving at highway speeds, my 2019 Hyundai Tucson se suddenly loses acceleration and drops into a 30 mph 'limp mode' while the engine overheats. This creates an immediate highway safety hazard with an imminent risk of a rear-end collision. The vehicle also suffers from excessive oil consumption, requiring manual top-offs twice a week. The servicing dealership diagnosed a fuel system failure, quoting $5,847 to replace the fuel pump, fuel injectors, and oil gasket. Hyundai corporate (case #43358088) officially denied warranty coverage on October 12, 2026, falsely claiming wear and tear despite active txxm 150,000-mile extended warranty framework protections. Furthermore, there is a data discrepancy: the dealership pulled diagnostic trouble code p0172, but corporate claims the vehicle threw code p0173 and is withholding the physical diagnostic printout behind a fee paywall.

The new 2019 Hyundai Tucson equipped with the nu2. 0l gdi engine, I purchased in 1/2020 as the original owner to this day has been diagnosed with a burnt exhaust valve due to heavy oil consumption that has been an uncorrected documented manufacturer’s defect within Hyundai motor corporation. The excessive engine oil consumption has poisoned and destroyed the first catalytic converter, has fouled the combustion chamber which has consequently choked and burnt the exhaust valve with the excess oil ash and carbon buildup. The car was approved for a second catalytic converter install last week which my car currently sits at 125,000 miles and the dealership through the authority of approval with Hyundai motor America has replaced under warranty however subsequently running the excess consumption test, the car now has a burnt exhaust valve which Hyundai motor America is extending a “good faith” proposal which they are willing to replace 60% of the burnt valve and I’m responsible for the 40% even though I have complied fully with the dealership’s recommended preventive maintenance schedule which has been solely performed at the same dealership since the day I bought the car and drove off the lot up until the 100k mile warranty. And now discovering my particular motor has been extended to the 15/150,000 warranty due to the lawsuit settlement. I have continued with my diligence with keeping up with the oil, instead of ignoring the issue that the car burns excessive oil to potentially has the engine fail while driving to be fully covered on the rod bearing failure settlement. Help in my concerns would be greatly appreciated through NHTSA.

On xxx, while driving at freeway speed in [xxx] with my [xxx] son in the back seat, the engine of my 2020 Hyundai Tucson (2. 4l theta ii gdi, approx. 99,108 miles) seized suddenly and without warning. I lost all motive power in moving traffic and coasted to the shoulder, where my son and I sat stranded for 30 minutes with smoke and a burning smell coming from the engine while waiting for a tow. No warning lamps or messages appeared before the failure. Component failed: engine. Tustin Hyundai ([xxx]) diagnosed the failure on ro xxx: engine seized; connecting rod pierced through the bottom of the engine block due to internal catastrophic failure at the crankshaft/bearings; starter had a burnt smell. The dealer recommends full long block replacement. The vehicle remains at tustin Hyundai and is available for inspection upon request. Confirmed Hyundai dealership technician (diagnosis on ro xxx) and an insurance adjuster (national general/allstate claim xxx, estimate of record on file). A goodwill request was submitted to Hyundai motor America and denied. Relevant defect history: this is the same connecting rod bearing failure mode for which Hyundai extended a limited lifetime warranty on 2018-2019 Tucson vehicles with the same theta ii 2. 4l gdi engine (TSB 22-em-001h-1/txxi). Hyundai service campaign 9c2 (theta ii ecu software update, issued xxx) was open and incomplete on my VIN at the time of failure and was performed only at the post-failure service visit. Oil consumption without external leaks, a documented characteristic of this engine defect, was present before the failure. Safety risk: sudden total loss of motive power at highway speed in traffic with a child aboard created a serious risk of collision, and the 30-minute roadside wait exposed us to passing traffic. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

See all problems of the 2020 Hyundai Tucson 🔎.

I had bought my car in may of 2025 and within 12 hours of owning it. The check engine light came on. They replaced the sensor well. A couple days later, the check engine light came on again, and they had to rebuild my whole engine had the car for a month at this time. When they rebuilt the engine, they had the car for over a month. And ever since I got it back, it's always something the same thing has to get repaired. Well, I took it to the shop. Yesterday because it was misfiring, and I needed to have some spark plugs replaced, and they said that the ignition coil needed to be replaced, but there was a recall on that not too long ago. And they fixed that on the recall. There's no reason that should have already went a few months later. Well, the problem is when I bought my car, I bought it from tar. Hyundai, it's now rusty, while it's Hyundai. They charged me $200 just to get my car out of their lot. Because I refused service because they were trying to charge me. $2500 to fix my car. Now mind you, I've already put over $4000 extra into this car. After purchasing it for over 21000 now they're not wanting to honor any work that tara. Hyundai done because they don't be responsible. They don't want to honor the tar. Hyundai warranty or anything I've had it with this Hyundai company. I've been driving this lemon. It is yet again in the shop. Being fixed, although the engine was rebuilt a year ago, there is no reason. This car should keep having engine failure. They don't want to honor it. They don't want to give me a new car, they don't want to, they're acting like they don't care like, 00 well, it's your fault, but I did not buy the car, as is it came with a warranty. When they reserved my engine and had to rebuild it. They extended my warranty 2 hundred and fifty thousand miles.

Vehicle fuel injector code p053f84 reading on 9/9/26, this is the second time vehicle was taken to the dealership for the exact same problem, the idle button in orange, and displayed, first visit while vehicle within warranty limits technician stated couldn't find anything wrong, now vehicle is out of warranty and dealership wants $1300 to fix the same issue. Also the engine was hesitating at each occurrence.

See all problems of the 2022 Hyundai Tucson 🔎.

Engine and recall notification malfunction: my 2015 hundai tuscon exerperienced a catastrophic engine failure/seizure while driving. Hyundai is denying an engine replacement under their extended warranty under the ksds software update (campaign 966) because the software update wasn't completed. However, Hyundai failed to notify me of this requirement; I purchased the automobile in Jan 2024. The ksds recall was sent out in 2021. I recently received an official physical mailer from Hyundai motor America titled 'important vehicle service required' for my VIN. On that official notice, there is a dedicated section explicitly titled 'other recalls and/or improvement repairs needed (associated with my VIN). ' Hyundai corporate left this b ox completely blank, officially misinforming me that no other active campaigns existed for my vehicle. This represents a critical malfunction in Hyundai's automated recall and campaign notification mailing systems, which actively misleads consumers and keeps them in the dark about mandatory preservation updates. Either Hyundai's automated notification systems completely failed to inform me of mandatory nature of campaign 966 - which is directly proven by my official printed mailer leaving the open campaign box completely blank - or the service was performed during a prior dealership visit and failed to register in the corporate database due to an administrative tracking error. I am requesting an audit of the vehicle's engine control module rom id to confirm if the calibration updates is physically present on the vehicle computer.

Engine has defect that causes oil to heat at an unusual levels there for damaging other vehicle components such as the exhaust system parts clogging up and triggering check engine warning lights for emissions.

While going down the highway at around 72 mph , my car went into limp mode. I was unable to accelerate, the brake and wheel locked. And then the engine light began flashing. The limp mode , non acceleration, and flashing engine light have happened twice before this instance. The first two times the pulled the p1326 knock sensor code and replaced it. Did the update, and sent me on my way saying it was fine. Now this most recent time (the 3rd time), the engine has failed. A carfax report says my car already had the engine replaced at 52k miles, meaning there’s 1 something internally wrong and 2 it’s still well within mileage warranty for another engine replacement. This car is extremely dangerous as it can literally stop in the middle of the highway. I went from 72 to about 15 mph in seconds, I was unable to get over or accelerate. It was terrifying. Now dealing with Hyundai - they don’t want to take fault.

See all problems of the 2017 Hyundai Tucson 🔎.

I am reporting a suspected safety defect involving my daughter's 2017 Hyundai Tucson, VIN [xxx], with approximately 77,940 miles. The vehicle experienced an engine failure beginning with the illumination of the oil-pressure warning light and check engine light, followed by a pronounced engine knocking noise. The vehicle subsequently could not continue running. The vehicle was inspected by a Hyundai dealership, which diagnosed an engine failure. I am aware of Hyundai safety recall 209 / NHTSA recall 21v-727 involving certain 2017 Hyundai Tucson vehicles equipped with the 2. 0-liter nu gdi engine. Hyundai's recall documentation identifies premature connecting-rod-bearing wear and specifically identifies abnormal engine knocking and illumination of the oil-pressure warning light as symptoms that can precede engine damage and stalling. My daughter's vehicle experienced these same symptoms. Hyundai has informed us that this particular VIN is not included in recall 209 and Hyundai motor America has denied our request for assistance. I am therefore asking NHTSA to review this complaint as a potential safety defect and determine whether there may be additional 2017 Tucson vehicles outside the current recall 209 population experiencing the same or substantially similar engine failure. I am not claiming that the vehicle is definitively covered by recall 209. Rather, I am asking NHTSA to investigate whether the exclusion of this vehicle is appropriate given the similarity between the actual failure symptoms and the defect identified in recall 209. I can provide the dealership's diagnostic documentation, Hyundai motor America's denial, photographs, maintenance records, and other supporting information upon request. Vehicle: 2017 Hyundai Tucson, VIN: [xxx], mileage: approximately 77,940 miles failure: engine knocking, oil-pressure warning light, check engine light, engine failure/stalling related recall: Hyundai recall 209 / NHTSA 21v-727. I information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 5.

The car was shaking, idling and accelerating and engine lights on.

I took my Tucson to my local Hyundai dealership on Friday, August 28, 2026. It was there for a standard oil change and tire rotation. When I scheduled the appointment online the system also said there was a recall. I always stay on top of that so I let them take care of that as well. The recall didn’t seem like anything major, it was something to do with emissions. Ok, when I left the dealership that day the engine was warm so there was no noticeable difference. I didn’t use my vehicle at all for the next few days. When I got into it Monday morning for work I noticed immediately after starting the car and taking off the engine was hesitating and bucking. This lasted a few minutes. The problem seems to improve once the engine is warm but others are reporting online that they’re having issues with engines stalling as well. There’s something wrong with the software update that’s being used and no one seems to have a fix. I reached out to Hyundai with my concern and they recommended I take it back to the dealership to be diagnosed and see if my warranty would cover any repairs. My vehicle was free of problems before that update and now it’s falling back on me to pay for a potential problem they caused. There has been no accidents for me personally with this but it’s most definitely a safety hazard.

See all problems of the 2018 Hyundai Tucson 🔎.

Sudden uncommanded high engine revving 4000 rpm with loss of forward acceleration while driving. Isg (idle stop n go) indicator on dashboard turned yellow and system could not manually override. Vehicle was turned off. After car turned back on after about 30 minutes it entered a protective limp home mode, which cleared the systems. All seemed back to normal. It was advised to have vehicle towed to the dealer where purchased. The vehicle has only 4,000 miles and 9 months old. To date the dealer could not replicate the malfunction and could not find any abnormalities in the codes.

The vehicle unexpectedly entered 'limp mode' due to engine tracking code p1326. The vehicle severely restricts engine power and rpms while driving on public roads, preventing normal acceleration. This creates a severe safety hazard as the vehicle cannot safely merge into oncoming traffic, accelerate away from intersections, or maintain basic road speeds, putting me at a high risk of being rear-ended. The fault is under Hyundai theta ii txxm. I have been given the runaround by both hyunday corporate and the local dealer.

Onxxx my car experienced sudden knocking in the engine. I pulled over to the service station on the [xxx] and had my car towed to empire Hyundai in [xxx]. I had just changed oil on xxxand upon inspection oil level was fine. Problem is the theta 2 engine and though the car is under extended warranty Hyundai is requesting maintenance records before repairing this. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

The contact owns a 2022 Hyundai Tucson. The contact stated while driving at an undisclosed speed, several unknown warning lights illuminated. The vehicle was taken to an independent mechanic, where it was diagnosed with ecu software error. The contact was advised to contact the dealer. The dealer was made aware of the failure and advised the contact to report the failure to the NHTSA hotline. The contact referenced an unknown recall; however, the VIN was not associated with a recall related to the failure. The manufacturer was not made aware of the failure. The failure mileage was approximately 108,565.

Franchise dealer preson Hyundai is actively obstructing a court-ordered settlement tracking test for an engine burning 2. 0 qts internally, forcing a young driver with child to operate an oil starving vehicle at risk of highway engine seizure and fire.

Vehicle turned itself off with no warning while being driven @ 40 moh. Dealer suspects fuel injectors, but could be ignition coil.

Vehicle is losing a lot of oil. But there is no oil leaking on the ground. Upon looking at the safety recall, it says it might be fire hazardous. I noticed smoke coming from under the hood. Vehicle run rough and also hear sounds.

?on Thursday, August 6, 2026, while driving my 2018 Hyundai Tucson on interstate 81, the vehicle experienced sudden, severe engine vibration and a loud metallic ticking sound before losing power and stalling completely on the highway. I was stranded on the side of the highway in a high-speed traffic zone, creating an immediate and hazardous safety situation. ?because the vehicle was completely inoperable, I was forced to pay $200 out-of-pocket to have the vehicle towed 35 miles to the nearest authorized Hyundai dealership service center. ?upon arrival at the dealership, an on-site service technician performed an obd-ii diagnostic scan on the lot and confirmed diagnostic trouble code p1326 (engine knock sensor detection system / connecting rod bearing failure). Despite the technician confirming the presence of this critical safety defect, the dealership service desk explicitly refused to enter the diagnostic code into Hyundai’s corporate system, stating they would not process or submit the vehicle for inspection or warranty authorization for over a month. ?Hyundai motor America customer care was contacted immediately and witnessed the dealership’s refusal to log the safety defect. While corporate assigned a case manager, Hyundai and the dealership have continually stalled the intake process under service campaign 966 / t6g and refused to provide direct-bill rental transportation or loaner support while the car sits disabled on the dealer lot. ?as a direct result of this sudden highway engine failure, the manufacturer's failure to address a known safety defect, and the refusal to provide recall mobility support, I have suffered ongoing financial loss, out-of-pocket towing expenses, and forced leave from employment. I am filing this report to document the hazardous highway failure of code p1326 and the refusal of the manufacturer and dealer to process a critical safety recall intake in a timely manner. My husband is the registered owner but I am the driver.

I bought my 2012 Hyundai Tucson from a used car dealership back in November of 2024 . When I bought the vehicle it only had 55,000 miles on it and came with a 2 year unlimited mile warranty on the drive train and a full carfax history in which everything came back clean , regular oil changes with synthetic oil every 4,000 miles and for my warranty through the used car dealership requirements I have continued to honor the every 4,000 mile oil change with synthetic oil every time . I have my carfax that shows that my vehicle was brought to a certified Hyundai dealership back in 2019 for maintenance and the dealership never applied the required ksds software update to extend my warranty. Flash forward to 8/06/2026 my vehicle with only 94,000 miles on it is sitting at a Hyundai dealership with the engine blown . I filed a claim with Hyundai and of course they denied it . I filed a complaint with corporate because it was at a certified Hyundai dealership back in 2019 they have had the updated ksds software available at the time knew that it was a requirement for the extended warranty and didn't add the software update to my vehicle. I have asked for a good faith gesture and was also denied . I'm on a fixed income with a disabled husband and a disabled son . I still owe a considerable amount on the vehicle since I've only owned it for 1 year 7 months . The used car dealership I bought it from will only cover up to $2,900. 00 of the repairs and the new engine is costing me $7,601. 01 . Leaving me with a remaining bill of $4,701. 01 . While that's pennies to them to me that's 4 months rent and my family not eating for 4 months . . I even tried to work with them to split the cost and again was denied . They know their 2. 4 theta engine is inferior and was court ordered to extend their warranty. I was informed when I brought it to the dealership that is fixing which is also a certified Hyundai dealership that it has 4 open recalls attached to my vehicle that needed to be fixed.

See all problems of the 2012 Hyundai Tucson 🔎.

Vehicle was operating normally and when arriving at a gas station to refuel the vehicle would not start after turning off. Vehicle was towed to the dealership (larry miller Hyundai albuquerque, and a seized motor was described as the discrepancy. No further maintenance has been performed.

While driving my 2022 Hyundai Tucson hybrid, the vehicle suddenly lost power, began shaking, and all warning lights illuminated at once. The car would not accelerate properly and became unsafe to operate in traffic. After pulling over and restarting the vehicle, the warnings cleared, but the issue has occurred more than once. It first occurred 3/25/26. The dealer was not able to reproduce the issue but found numerous faults and reset them. This is a serious safety concern because the vehicle can unexpectedly lose motor power while driving, creating a risk of collision. The problem is intermittent and unpredictable.

My 2018 Hyundai Tucson with the 2. 0l engine has suffered catastrophic engine failure. The engine lost compression in cylinder 4 and now requires a full replacement . This is part of a broader pattern—the 2016–2018 Tucson is known for excessive oil consumption that leads to engine failure, with over 1,900 engine-related complaints filed with NHTSA across these model years . Prior to this failure, I reported excessive oil consumption and other engine issues to my dealership. Despite these reports, the problem was not resolved, and I was given inadequate guidance on how to address it. The engine ultimately failed while I was driving, creating a sudden loss of power that posed a safety risk. Other Hyundai Tucson vehicles with the same engine have been covered by recalls for related engine defects , but my specific VIN was not included, despite exhibiting identical symptoms. Meanwhile, other owners report that similar engine failures have been dismissed or denied coverage by Hyundai . This inconsistency in how the manufacturer handles a known, widespread defect is what prompted me to file this complaint.

I own a Hyundai Tucson 2018 sel plus. My problem is my vehicle is coming to the end of it's 100,000 mile warranty. This vehicle started burning oil about 30,000 miles and it got worse. I checked on recalls and there was no recalls for my VIN number for this vehicle. My Hyundai vehicle is burning a quart of oil every 300 miles and this is no exaggeration. I bought the car brand new and had to replace my 1st catalytic converter at 79,627 miles on 5/14/25 that was originally on the car. The second catalytic converter that I had put on I, had to replace that catalytic converter again at my cost at approximately $900. 00 and then after that it plugged up again at 91,928 miles on 7/28/26 and I, had to replace that one that is the third one now. The catalytic converter company had warranted the work and the converter to be installed. This has caused the car to not only misfire, but become a possible road hazard to miss enough and possibly cause it to stall or reduce the power output of the vehicle while in operation and on public roads in traffic and possibly create a major accident on the freeway. This is a major saftey concern being that you could not only lose power while in motion but could lock up the engine. We talked to mechanics, other people that own them and even the service guys at Hyundai knew it is problem. The service genteman said that they would clean the valves I, believe they talked about cleaning the valves with walnuts like sand blasting and I, told him cleaning the valves is not going to do anything for the oil consumption, because the oil consumption is the engine. The engine when it was originally made on the number 3 cyclinder was bored wrong. That is our problem because the oil rings and rings are letting the oil bypass the piston and filing out the iriadium spark plug and our car mileage has gone down because of this the rings are wearing faster and causing us to keep buying newer spark plugs. " check engine light flashes " plugged cat converter.

The contact owns a 2017 Hyundai Tucson. The contact stated that while driving at an undisclosed speed, the vehicle was shaking and vibrating abnormally, and the engine was making abnormal sounds. The check engine warning light was illuminated. The vehicle was taken to an independent mechanic, and an oil change was performed as associated with NHTSA campaign number: 21v727000 (engine); however, the VIN was not included in the recall. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 97,000.

While stopped at a traffic light, the engine began producing a loud metallic clattering and clanking sound, consistent with connecting rod bearing failure (rod knock). There was no prior warning light or indication of this specific failure. When the light changed, the vehicle would not accelerate normally, leaving me stalled in a lane of moving traffic. I was forced to make an emergency turn to get the vehicle out of the way of oncoming and crossing traffic. The engine would not hold an idle afterward and has not run since. The vehicle was towed to a Hyundai dealership, where a service department employee stated by phone that this 1. 6l turbocharged engine family has a known, documented history of severe factory defects affecting the connecting rod bearings.

High excessive oil consumption and premature piston ring failure leading to excessive oil consumption.

Complete engine failure in July of 2024. When the car was sold to us it was under recall and not repaired and we were not told there was a recall. When the engine failed we were told we were at fault because we failed to get the recall addressed.

See all problems of the 2014 Hyundai Tucson 🔎.

The engine lost power while driving, and the vehicle entered a reduced-power mode. The check engine light began flashing, and the engine made a loud knocking noise during acceleration. A diagnostic scan showed code p1326 (knock sensor signal range/performance). The knock sensor was replaced, and the engine oil was refilled after discovering an oil leak. The vehicle operated normally for a short time, but the same symptoms returned. The vehicle is available for inspection. The vehicle suddenly lost power while traveling approximately 70 mph on the highway, making it difficult to maintain speed and safely keep up with traffic. This created a risk of being struck by other vehicles or causing an accident. The problem has since recurred during normal driving. The problem has been reproduced multiple times. A diagnostic scanner consistently identified code p1326. The knock sensor was replaced and the engine oil was replenished, but the same symptoms returned after several trips. The vehicle has not yet been inspected by a Hyundai dealership. The vehicle has been inspected by the owner and a family mechanic who replaced the knock sensor and identified an engine oil leak. It has not yet been inspected by Hyundai, law enforcement, or an insurance representative. There were no warning lights or messages indicating low engine oil or an oil leak before the failure occurred. I had the engine oil changed approximately one month before the incident. While driving on the highway at approximately 70 mph, the vehicle suddenly lost power, the check engine light began flashing, and the engine started making a loud knocking noise. After inspecting the vehicle, we discovered it had an engine oil leak and the oil level was low. Before the loss of power, there were no warning signs that the engine was losing oil or that there was an oil leak.

2018 Hyundai Tucson catastrophic engine failure consistent with known Hyundai nu engine defect pattern documented across 141 prior owner-filed NHTSA complaints for this same vehicle. Obd codes p0326, p0301, p0302, p0303, p0304 documented July 19–25, 2026. Independent licensed mechanic confirmed in writing that engine requires replacement. Authorized Hyundai dealership service manager verbally confirmed coolant in oil — the exact failure mode documented in prior NHTSA complaints for this vehicle generation. Service campaign 966/ksds was completed and active when failure occurred and did not prevent it. Hyundai motor America denied goodwill claim case #43120457 citing out-of-warranty status and aftermarket parts — no written test results or inspection report has been produced to this household. Requesting federal investigation into pattern of engine failures in 2018 Hyundai Tucson consistent with acknowledged nu engine defects.

Incident summary: on 07/16/2026, my 2018 Hyundai Tucson experienced a severe engine failure resulting in sudden knocking sound from engine and stopped in middle of road. This sudden failure while operating the vehicle created an immediate safety risk on the roadway. ?the vehicle was taken to rick case Hyundai on 07/22/2026 , where diagnostics confirmed on 07/24/2026 internal engine damage tied to connecting rod bearing wear—a known, widespread safety hazard affecting Hyundai 2. 0l nu gdi engines. ?reason for complaint: Hyundai motor America denied warranty coverage and engine replacement, claiming that service campaign 966 / knock sensor detection system (ksds) software had not been installed prior to the failure. ?the ksds update is a software monitoring/warning tool, not a mechanical fix or routine maintenance requirement. Missing a software patch does not cause physical connecting rod bearing failure. Hyundai is using missing software updates to systematically deny coverage for known, dangerous engine defects. ?I am reporting this incident because sudden engine stalling on public roads poses a severe crash hazard, and Hyundai should not be permitted to avoid addressing safety-critical mechanical failures based on procedural software campaign exclusions.