2018 Hyundai Tucson: engine knocking or ticking

Filed Sep 14, 2026 · Brakes, Engine · 164,000 miles · FL

The contact owns a 2018 Hyundai Tucson. The contact stated that while driving approximately 65 MPH, there was a knocking sound coming from the engine compartment, and the vehicle started shaking aggressively. The brake pedal was depressed; however, the vehicle failed to respond as needed, and the vehicle lost power steering functionality. The vehicle was coasted to the side of the road, and the parking brake was engaged. The vehicle stalled and was towed to the nearest gas station. The vehicle failed to start and was towed to the residence. The failure mileage was approximately 164,000.

Filed Aug 12, 2026 · Engine · NY

​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.

Filed Jul 24, 2026 · Engine · GA

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.

Filed May 8, 2026 · Engine, Transmission · TX

The 2.0L engine catastrophically failed during normal highway driving, consistent with a thrown connecting rod. The vehicle suddenly lost power on a roadway with tractor-trailer traffic. The driver and a child passenger narrowly avoided being struck by a semi-truck before the vehicle could be brought to a safe stop. No prior warning lamps, no check engine light, no abnormal noises, and no indications of any kind preceded the failure. The failed engine is currently at a Hyundai dealership and is available for inspection. The dealer has confirmed catastrophic engine failure and submitted an engine replacement request to Hyundai Motor America. Hyundai Motor America declined the engine replacement request, citing incomplete status on Service Campaign 966 (Knock Sensor Detection System update for connecting rod bearing wear). The owner purchased the vehicle used and was never notified by Hyundai of Service Campaign 966. The owner also was never notified of the federal safety agency Recall 20V543000 (ABS module fire risk), which remains open and unrepaired on this vehicle, demonstrating a pattern of failed manufacturer notification to the current registered owner. This vehicle is a Class Vehicle in the Hyundai/Kia Theta II engine class action settlement (In re: Hyundai and Kia Engine Litigation), which extended powertrain coverage to a lifetime warranty for connecting rod bearing failure on 2018 Tucson vehicles equipped with the Theta II 2.0L engine. The failure mode experienced is precisely the defect this settlement and Campaign 966 were designed to address. Component that failed: engine, specifically connecting rod bearing/short block assembly. Component is available for inspection. Vehicle has approximately 71,000 miles. The failure created an immediate and severe risk of fatal collision involving a child passenger. Manufacturer has been contacted and has denied warranty coverage. the federal safety agency action is requested regarding both the engine defect denial pattern and the unrepaired ABS fire-ri

Filed Feb 23, 2026 · Engine · FL

I have experienced two near-fatal incidents involving a sudden, uncommanded loss of motive power while traveling at highway speeds (approx. 70 MPH). On February 11, 2026, the vehicle entered "Limp Home Mode" without warning, dropping speed to 60 MPH and 2000 RPM in heavy traffic. This caused an immediate and dangerous speed differential, nearly resulting in a high-speed rear-end collision. Simultaneously, the AC system disabled, indicating a severe engine protection event. Manufacturer Negligence: The vehicle was taken to Courtesy Hyundai of Tampa twice for this issue (Code P0087). They performed a "Knock Sensor" replacement and cleared data points, assuring me the vehicle was safe. The failure recurred immediately. I subsequently took the vehicle to Brandon Hyundai on February 13, 2026. Despite my reports of near-fatal highway failures, Brandon Hyundai was instructed by Hyundai Corporate to merely repeat the "Knock Sensor" replacement—a repair that had already failed to resolve the dangerous condition. Critical Safety Admission: On 02/23/2026, Brandon Hyundai Service Advisor Abel Gomez explicitly admitted that this repair is "not a fix, it is a temporary thing until it shows again," yet stated they must follow Corporate’s directive to release the car. Requested Action: Hyundai is knowingly releasing a vehicle with a recurring, life-threatening defect (P0087/Sudden Power Loss) by performing "band-aid" sensor swaps instead of addressing the high-pressure fuel system or internal engine failure. This practice is a direct violation of the Safety Act. I request an immediate investigation into Hyundai’s refusal to perform permanent repairs on GDI engines displaying these catastrophic failure codes.

Filed Feb 15, 2026 · Engine · FL

I am writing this letter to formally document a series of catastrophic safety failures and gross negligence regarding my 2018 Hyundai Tucson. On two separate occasions, including as recently as Wednesday, February 11, 2026, I narrowly escaped a fatal high-speed collision because this vehicle entered "Engine Protection Mode" while traveling at highway speeds. Incident Timeline: Previous Service: I have visited Courtesy Hyundai of Tampa twice for engine-related symptoms and code P0087. They replaced the knock sensor and assured me the vehicle was safe. Safety Incident (Feb 11, 2026): While driving on the highway, the vehicle suddenly lost power, dropping to 60mph and 2000 RPM (Limp Mode) in heavy traffic. This sudden deceleration nearly caused a high-speed rear-end collision. Current Status: The vehicle is currently at Brandon Hyundai (as of Feb 13, 2026). I have been told a review will take 3-5 business days, leaving me without safe transportation or a loaner vehicle. Negligence and Liability: Courtesy Hyundai of Tampa was aware of the recurring P0087 code and engine performance issues. By clearing codes or replacing minor sensors (knock sensor) without addressing the underlying high-pressure fuel or internal engine failure, they released a dangerous, defective product onto the road. This vehicle is clearly covered under the Theta II GDI Engine Settlement and Service Campaign 966. The local dealerships are willfully avoiding a necessary engine replacement to save on internal costs, despite knowing the vehicle is prone to sudden failure. Demand for Action: Immediate Loaner Vehicle: I require a safe rental/loaner vehicle immediately, paid for by Hyundai, while my car is being inspected. Full Engine Replacement: I am demanding a full engine replacement as previously indicated by technicians should the light return. Expedited Review: I am extremely unsatisfied to be told again I have to wait "3-5 business days" for a safety-critical evaluation of a vehicle that has alre

Filed Feb 11, 2026 · Engine · UT

My 2018 Hyundai Tucson experienced sudden catastrophic engine failure when a connecting rod threw while driving. The engine burned through its oil and the vehicle became inoperable. Hyundai denied warranty coverage for this engine failure because I had not completed the 2021 KSDS (Knock Sensor Detection System) recall. I was never notified of this recall. The KSDS recall is a software update intended to detect engine knock. It does not prevent mechanical engine failure. Denying warranty coverage due to a software update that I was unaware of raises safety concerns, as engine failure can occur suddenly while driving and creates risk of crash or injury. This appears related to known engine issues in Hyundai vehicles. I am concerned this is a broader safety defect affecting other consumers.

Filed Jan 20, 2026 · Engine · CA

The car began making a knocking sound on my 5.8 mile drive. On my drive home from work, the knocking was louder, and the car barely accelerated on the highway and over-revved trying to hit at least 50 mph to keep up with the flow of traffic. I took the car to the Hyundai Service Center immediately using city streets rather than the highway. I had a family member follow me to make sure I made it to the service center as well as give me a ride home after I dropped off the vehicle. As I was driving there, the car had a hard time accelerating from a stop and barely maintaining speed of the flow of traffic and the “Check Engine” light came on and flashed as I got closer to the dealer service center. The dealer service center confirmed that the engine needs to be replaced due to the connecting rod bearing failure, a common issue with the 2.0L I4 F DOHC 16 V engine in my 2018 Hyundai Tucson. The Hyundai Service Manager has repeatedly confirmed that the engine issues presented in my car are consistent with a recall for the same model engine found in my car.

Filed Jan 14, 2026 · Acceleration, Engine · MN

The engine and engine management system of my 2018 Hyundai Tucson experienced repeated failures resulting in loss of propulsion and unsafe drivability. In November 2025, while traveling approximately 75 mph on a freeway, the vehicle suddenly entered limp mode without any prior warning, causing an abrupt loss of power in active highway traffic. No warning lamps or messages appeared before the failure. After the loss of propulsion occurred, the check engine light, battery light, and oil light illuminated sequentially. Diagnostic trouble codes P1326 and P0326 were recorded. Initial inspection indicated severe oil consumption despite a recent oil change less than 2,000 miles earlier. A Hyundai dealership replaced knock sensors under warranty. Shortly after release (30 miles), the vehicle again exhibited severe drivability issues, including a flashing check engine light, and required immediate towing. A second Hyundai dealership replaced the short engine block under warranty. Approximately 180 miles after the engine replacement, the vehicle again developed unsafe drivability symptoms, including delayed throttle response, failure to accelerate unless the accelerator was fully depressed multiple times, jerking or lugging when slowing or stopped, and a faint whining noise. The check engine light illuminated again. These failures represent repeated loss of propulsion and unsafe operation following manufacturer-approved repairs, including full engine replacement. The vehicle has been out of service for approximately 57 days and remains in the custody of a Hyundai dealership awaiting diagnostics. The vehicle is available for inspection upon request. The sudden and unpredictable loss of power at highway speed created a significant risk of collision and serious injury to the driver and surrounding motorists.

Filed Aug 3, 2025 · Engine, Transmission · OH

29 days after I bought a 2018 Hyundai Tucson. The vehicle started making a ticking noise and stopped accelerating. I called the dealership and they said we didn't get a warranty. I said no that isn't correct, no warranty was offered and after seeing ALL the known engine problems I understand why ken ganley in medina wouldn't offer one. Now not even a month into having this vehicle, I have a brand new 5 year loan and a vehicle that won't move until I put a new engine in it and the dealership won't do anything for me. This is the worst experience I have ever had purchasing a vehicle

Filed Jul 19, 2025 · Engine, Transmission · MN

My 2018 Hyundai Tucson 2.0L GDI engine with only 79,000 miles was "knocking" and wouldn't accelerate. We pulled over and towed the vehicle to the local Hyundai Dealer who declared "oil level good but failed bearing clearance test". Diagnosed with a rod and bearing failure. They submitted to Hyundai Motor Warranty the vehicle needed new engine. They declined. I know this is covered under the Hyundai Engine 2 Class action lawsuit with the extended 15 year/150,000 mile warranty as a result of the catastrophic engine failures. I have all oil change service records for every 5,000-6,000 miles while I was the second owner, as well as, have obtained another from the dealer who bought it from a rental/lease company starting at 14,000 miles. Hyundai Corporate is claiming "exceptional maintenance neglect" because of one missing oil change record from the rental company that I may not be able to obtain as the paper trail for the rental car company only states first owner was rental/fleet

Filed Jun 4, 2025 · Engine · IA

I noticed my vehicle was burning through oil, initially indicated by a P011 code, when I called Hyundai they said its often a symptom related to low oil pressure. After oil changes, the code would clear, but it returned multiple times, and on two occasions, the dipstick showed no oil when checked. Despite staying current on oil changes and maintenance, I was dismissed as excessive oil burning being “common” for this engine. After recent recall updates at the dealership, a technician confirmed excessive carbon buildup and that my catalytic converter was beginning to plug. I inquired about an extended warranty offered due to the knock sensor installation but was told it only covers rod bearing failure. Hyundai Corporate echoed this, stating no coverage until catastrophic engine failure occurs, despite the ongoing damage from oil burning and converter clogging. Since my visit to the Hyundai dealership, the symptoms have rapidly escalated. Now, my vehicle is extremely loud and acceleration is poor. It takes a long time to get up to speed, and I worry about driving it as it may result in an accident.