Hyundai
Tucson

Part(s) Affected: Engine / Engine Control / Stall / Loss of Power Summary: My 2016 Hyundai Tucson (VIN: [XXX] ) has an active P1326 – Knock Sensor Detection System (KSDS) code, which indicates rod bearing wear and imminent engine failure. The vehicle experiences: •loss of power •inability to accelerate •engine hesitation •risk of stalling while driving These are serious safety risks. This issue is part of the Hyundai/Kia engine defect settlement XXX), yet Hyundai refuses to provide towing or address the safety risk despite the P1326 code being a known precursor to engine seizure. The vehicle is currently unsafe to drive, and Hyundai Customer Care has refused to escalate my case according to settlement requirements. This is a safety hazard that can cause engine seizure and sudden loss of power while driving. Details: •Hyundai Case #: XXX •Engine settlement code P1326 confirmed •Hyundai refusing proper support •Vehicle should not be driven NHTSA intervention is needed due to Hyundai’s failure to address a known safety defect. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Engine failure at 67k, Hyundai denied warranty

The contact owns a 2016 Hyundai Tucson. The contact stated that while driving at an undisclosed speed, the vehicle failed to accelerate as intended while depressing the accelerator pedal. In addition, the contact stated that the vehicle stalled, and there was an abnormal sound coming from the engine. The check engine warning light was illuminated. The contact took the vehicle to Auto Zone, and a scanner was used to diagnose the vehicle. And it was determined that the catalytic converter had failed. The contact took the vehicle to an independent mechanic, who diagnosed the vehicle with oil intrusion into the catalytic converter. The contact stated that the failure persisted. The contact stated that on a separate occasion, the vehicle failed to accelerate as intended while depressing the accelerator pedal. The contact stated that the engine was consuming an excessive amount of engine oil, and an abnormal sound was coming from the engine. The contact stated that the vehicle stalled again. The contact was adding seven quarts of oil for every 3,000 miles driven. In addition, the catalytic converter failed to function as intended. No warning light was illuminated. The contact was concerned that the engine could fail. The manufacturer was made aware of the failure. The failure mileage was unknown.

Brought vehicle in on 07/10/25 to dealership with very low oil, it was determined vehicle was burning oil and combustion cleaning was recommended. Hyundai Corp. denied claim due to 2nd owner. We are not 2nd owner had to transfer title upon my father's death, vehicle owned by family. Hyundai then approved claim and combustion cleaning was done. We were then told by dealership to bring in vehicle every 1000 to check oil. On 2nd 1000 check it was determined to be burning oil and needed engine replacement. Hyundai Corp. denied claim this time stating gross maintenance neglect from 01/2018-06/2019 period but only 3084 miles were put on between oil change. This was not brought up during combustion denial. Also Hyundai stating out of warranty which expired 08/24/25 but issues started in 07/2025. I have asked Hyundai Case Manager to provide written proof in owner's manual where it shows we did not maintain vehicle in accordance to manual.

My 2016 Hyundai Tucson has a severe engine defect that causes excessive oil consumption and poses a safety risk while driving. It constantly throws the P1326 engine issue, which is the knock sensor.The issue is not due to any misuse or neglect on my part. The vehicle consumes approximately one quart of oil per week, and I have been advised by two different Hyundai dealerships not to invest any money into repairs because the engine should be replaced under Hyundai’s extended engine warranty (15 years/150,000 miles).Despite multiple attempts to get the issue resolved over the past year, Hyundai continues to deny the engine replacement, leaving me with no resolution and forcing me to drive an unsafe vehicle.The engine burns an excessive amount of oil and needs frequent refilling to prevent damage.The vehicle has stalled and runs rough at times, creating a safety concern.Both Hyundai dealerships I’ve visited confirmed that this is a known issue and advised me not to spend money on repairs since the engine qualifies for replacement under the extended warranty.Hyundai corporate continues to deny coverage and has not repaired or replaced the engine despite the clear warranty terms.The issue has persisted for nearly a year, and the vehicle continues to deteriorate.I believe this defect poses a serious safety hazard because the engine can fail without warning while driving. The excessive oil consumption also increases the risk of engine seizure, stalling, or fire. I am currently forced to operate the vehicle in unsafe conditions due to Hyundai’s inaction. I am requesting that NHTSA investigate this ongoing engine defect and Hyundai’s repeated denial of warranty coverage for affected Tucson models. Owners should not be forced to drive unsafe vehicles or pay for repairs that should be covered under Hyundai’s extended

car often does not accelerate when hitting the gas. Was turning onto highway from a stop car did not accelerate causing other vehicle to swerve to avoid hitting me as my car would not move. Couple seconds later it moved

Have had to replace all four window regulators. From searching online, it appears there are quite a few other people who have had the same issue. Raising this issue in case others have to to create a recall. Thank you

Oil consumption is uneven, unpredictable, and has been a problem for at least 30,000 miles and since 2020. The car has ~74k miles on it and I carry a case of oil in the trunk. A couple years ago our catalytic converter clogged (I suspect from burning oil) and we were stuck on the roadside. Dealer replaced the catalytic converter under the power train warranty, but has not addressed the oil beyond a few consumption tests. They say it's "within normal parameters" but last night at a rest stop I had to add oil AGAIN. I feel like they're trying to wait until the warranty is up and then tell me it's not their problem.