Kia Optima engine failure problems

Filed Nov 5, 2026 · Engine · AZ

My Kia experienced catastrophic engine failure while I was driving on the freeway, creating an extremely frightening and dangerous situation. The sudden loss of engine power put my safety and the safety of surrounding motorists at risk, as I was traveling at freeway speeds when the engine gave out. Leading up to the failure, my vehicle experienced excessive oil consumption despite regular maintenance. I was repeatedly adding oil between scheduled oil changes. Previous repairs, including replacement of spark plugs and a thermostat, did not resolve the underlying issue. Following the engine failure, a Kia dealership reported a cracked engine valve and multiple severely damaged or melted spark plugs, including spark plugs that had recently been replaced. These findings raise serious concerns about progressive internal engine damage and a potentially defective engine. Despite my concerns regarding known Kia engine defects and possible connecting rod bearing issues, the dealership stated it could not perform the bearing clearance test due to the condition of the valves. My case was never submitted to Kia Techline for further investigation. I was initially instructed to provide oil change and maintenance records for consideration of engine replacement assistance, only to later be told that excessive oil consumption was not relevant to my claim. I am extremely concerned that a potentially defective engine experienced progressive damage before suddenly failing on the freeway, placing my life and others at risk. I am requesting that the federal safety agency investigate this failure and determine whether it is related to known Kia engine defects or an unresolved safety issue affecting other vehicles.

Filed Nov 4, 2026 · Engine · WA

I was driving to work when all of the sudden I was pressing my gas, but I wasn't accelerating. I noticed my brakes and steering wheel were hard to push and turn. My car stopped in the middle of the road. I turned off my car and tried to turn the ignition and all I got was a single click. My engine, battery and oil lights were now on. They were not before. After 25 minutes in the middle of the road a sheriff came and pushed me to the side. When I put my car in neutral it was hard to steer and my brakes were hard to push. I was terrified that I was not going to be able to stop. I was scared I was going to be hit and someone would get seriously injured. I then received a call from Cascade Automotive saying that my engine seized from rod bearing failure but my engine was under warranty under the Kia Engine Class Settlement. I called Kia Consumer service and they said my Vin# qualified and was under warranty. I then had it towed to Kia of Puyallup. They confirmed it was a Rod Bearing failure that caused the seizure and told me it did qualify for the warranty. But then told me since I didn't get the HECU fuse update its void. I told them I never got a notice for the recall. They said it didn't matter and said to fix it, it would be $6700. I called Kia Consumer again and asked what can be done and they said nothing. I asked if they had any record of sending me or my dad ([XXX]) the recall notice and they said no and he wasn't in their records as the registered owner. I then asked since they have no record of sending the recall notice to me or my dad and I had no way of knowing about the HECU fuse if the warranty is good now and they said no, I should have looked for recall. There were no warning signs. I have maintained my car and had the oil changed regularly. My safety was put in jeopardy because Kia failed to notify me of a faulty engine and the HECU fuse. I asked for the records saying no notice was given and they said it was against their policy to send that. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORM

Filed Oct 23, 2026 · Engine · NC

There is a known issue with this vehicle and the fix by KIA is not safe nor fair to the consumer. Kia's knock sensor recall centers on the Knock Sensor Detection System (KSDS) software update for Theta II GDI engines. The update listens for rod bearing wear, triggers a check engine light and limp mode via Code P1326, and extends the engine warranty up to a lifetime or 15 years/150,000 miles. My problem is that we had to car in on May of 2026 after in went into limp mode. They updated the software. The car again went into limp mode on 10/21/2026, they updated the software again. My focus here is the fact that it is a known issue and they say it still does not meet the parameters for an engine replacement. It is a severe issue that is dangerous and inconvenient to the driver. You are afraid to take it on a trip or even take it on a highway. My 20 year old daughter drives this to college. Can you imagine a car going into limp mode on a majory US highway? Limp mode essentially does not allow a vehicle to go above 2K RPM. You cant go up a hill over 35 and on a highway, on a flat road you "might" be able to go 55 MPH. My daughter goes to college 4 hours away. This creates a very unsafe, dangerous and inconvenient environment. KIA is hoping that they can buy time until these vehicles fail for some other reason and they dont have to pay the cost for a new engine.... ALL at the consumers peril. To put this in perspective, if you have a vehicle with a "low tire pressure" warning, does lowering the sensors parameters fix the problem.... No, it just turns off the warning and you are driving a car with low tire pressure.

Filed Oct 21, 2026 · Engine, Transmission · CA

My 2018 Kia Optima has the Theta II 2.4L engine. In February 2026, the dealer performed an engine/powertrain computer reprogramming. In August 2026, the engine failed and the vehicle was taken to an authorized Kia dealer, where the engine was replaced under the Theta II engine warranty. The vehicle was at the dealer from August 8 until the repair was completed on September 29, 2026. When I picked up the vehicle on October 9, it felt shaky and vibrated on the drive home. On October 11, the vehicle began giving off a distinct, unfamiliar smell that is not like burning fuel or oil. On October 21, I found the vehicle leaking an opaque, milky tan fluid onto my garage floor. The type and source of the fluid are UNKNOWN. I have photos of the leak. My family and I have stopped driving the vehicle because we believe it is unsafe. We were driving it with our children before these symptoms appeared. Given the history of Theta II engine failures, we are concerned about the risk of engine failure, stalling, or fire while driving. The new symptoms have not yet been diagnosed or confirmed by a dealer. I am arranging for the vehicle to be towed to a Kia dealer for warranty diagnosis. The vehicle and leak are available for inspection. I have reported these issues to the manufacturer under an open customer case.

Filed Oct 15, 2026 · Engine · 145,848 miles · NC

The contact's daughter owns a 2014 Kia Optima. The contact stated that while driving at 45 MPH, the engine stalled and shut off. The vehicle coasted to the shoulder of the road. The contact stated that while attempting to start the vehicle, the engine failed to restart. The vehicle was towed to the dealer, where it was diagnosed with an engine failure and it was determined that the engine required replacement. The contact was informed that the repair was not covered under the federal safety agency Campaign Number: 17V224000 (Engine and Engine Cooling) due to insufficient service records. The manufacturer was notified of the failure, and a case was filed. The failure mileage was approximately 145,848.

Filed Oct 8, 2026 · Engine · FL

Vehicle shut off while driving at 40mph, engine seized ,will not crank .suspected conecting rod bearing failure under safety recall sc200, I call kia 18003334542 denied recall repair and bearing clearance test stating vehicle is rebuilt title. Federal safety recall cannot be denied due to rebuilt title per the federal safety agency .requesting recall remedy.

Filed Oct 8, 2026 · Driver assistance, Engine · SC

At around 103K miles, I took to the dealership for a multipoint inspection for knocking when braking and my forward collision/lane assist systems going offline mid drive. I learn I have to replace my axle, despite replacing my axle in sept 2025. I return a week after due to the red oil light blinking on randomly, and when I checked the oil myself it was dry. The braking and assumed wiring issues remained. I find out that my oil is low despite an oil change July 16th 2026. It is October 8th 2026 as I type this. I am doing an engine flush in hopes to improve oil consumption, but i have since learned that my engine may fail from these other Kia stories. I have not stalled or had engine failure yet but now I am worried about having to sell my car to avoid having to keep replacing the same flawed parts over and over, or worse injuring myself while driving it. I was hoping to take a trip but now I have to rent a car and play another 1,600 dollars for the engine flush which I have no guarantee will actually work. I am disgusted, and there should be consequences for KIA (and many other companies) for taking advantage of their customers. I need a new car now!

Filed Oct 5, 2026 · Steering · 153,000 miles · IL

The contact owns a 2014 Kia Optima. The contact’s son stated that while driving 30 MPH, the steering wheel became inoperable. The contact stated that the steering wheel seized, and significant effort was required to control or turn the steering wheel. The contact’s son also became aware of an electrical burning odor during the failure. The manufacturer was made aware of the failure by telephone. The failure mileage was approximately 153,000.

Filed Oct 1, 2026 · Engine · GA

purchased this vehicle on June 18, 2024, as a second owner with 125,019 miles on the odometer. Within months of purchase, the engine began exhibiting symptoms consistent with connecting rod bearing failure: engine knock, excessive oil burning (requiring oil top-ups every 2-3 weeks), and rough running. The check engine light illuminated with diagnostic code P1326 (Knock Sensor Detection System warning). I took the vehicle to Kia Stonecrest dealership for diagnosis. Kia informed me that the engine failure is not covered under warranty because I am not the original owner. A independent mechanic at Lions Auto evaluated the engine and quoted $4,800 for full engine replacement. THE DEFECT: This vehicle is equipped with a Theta II 2.4L GDI engine identical to engines in 2011-2019 Kia Optimas and Kia Sorento models that were subject to multiple recalls (including the federal safety agency Recall 17V‑224) and a $1.3 billion class action settlement. The defect is manufacturing debris left in the crankshaft oil passages during production, which restricts oil flow to connecting rod bearings, causing premature bearing wear, engine seizure, and potential engine fire. KIAS KNOWLEDGE AND RESPONSIBILITY: Kia had clear notice of this defect years before the 2020 model year was introduced. Despite this knowledge, Kia continued manufacturing 2020 and later Optimas with the identical Theta II 2.4L GDI engine without remedying the manufacturing process. The class action settlement litigation was filed in 2017 and covered model years through 2019; however, Kia’s decision to exclude 2020 models from coverage despite using the same defective engine creates an unjust gap in consumer protection. SAFETY CONCERN: Connecting rod bearing failure can cause sudden engine seizure while driving, resulting in loss of power steering and brake assist, creating an immediate crash hazard. The symptoms I experienced — engine knock and P1326 code — are documented precursors to catastrophic failure.

Filed Sep 29, 2026 · Engine · AR

The vehicle experienced a sudden and severe loss of engine power while being driven on the interstate at highway speeds. The vehicle lost the ability to accelerate normally beyond approximately 60 mph, the Check Engine Light began flashing rapidly, and the vehicle entered “Limp Home Mode.” This sudden loss of power occurred in heavy traffic and created an immediate risk of a high-speed rear-end collision. The vehicle was subsequently inspected by an authorized Kia dealership service center. Diagnostic testing confirmed DTC P1326 (Knock Sensor Detection System). The dealership performed the manufacturer’s Bearing Clearance Test (BCT), and the dealership paperwork documents a “NO PASS BCT” result. The dealership paperwork also documents that Service Campaign SC340 (Theta II 2.4L GDI ECM Software Upgrade) was performed on the vehicle. Despite the documented P1326 condition and the manufacturer’s “NO PASS BCT” result, the dealership is refusing to provide the engine replacement as a covered repair and has instead quoted approximately $9,000 for the engine replacement. I am requesting that the federal safety agency review this matter because the vehicle experienced a sudden loss of power at highway speeds, followed by a documented “NO PASS BCT” result from the manufacturer’s diagnostic procedure. The vehicle remains an unresolved safety concern. I am also requesting review of whether Kia is properly applying the applicable P1326/BCT engine-replacement procedure and associated coverage to this vehicle. The vehicle and all diagnostic and service paperwork are available for inspection upon request.