Kia Forte misfire problems

Filed Jul 6, 2026 · Engine · IN

respectfully submit this correspondence to request formal assistance regarding my 2015 Kia Forte EX, a vehicle covered under the class settlement. The vehicle is exhibiting severe symptoms consistent with KSDS‑related engine failure, yet the required diagnostic protocol has not been completed by the servicing dealership. The KSDS software update was performed in May 2022, and the vehicle currently has only 92,000 miles on the odometer, placing it well within the settlement’s mileage parameters. Despite this, the dealership has failed to follow KSDS procedures and has not produced any written documentation of its findings. All communication with the dealership has occurred exclusively by telephone. Despite repeated attempts to obtain information, I have not received a diagnostic sheet, video recording, code report, KSDS documentation, or any written summary of the vehicle’s condition. All statements provided to me have been verbal and inconsistent. My **primary symptoms** include: - Persistent and worsening **engine ticking** - **Burning excessive amounts of oil** - Activation of **limp mode** - A **flashing check engine light** These symptoms align with known indicators of KSDS‑related engine failure and warrant immediate and proper diagnostic evaluation under the settlement terms. The dealership has verbally stated that the issue may be related to **spark plugs and ignition coils**. However, plugs and coils are a **well‑documented secondary symptom** of rod bearing failure, caused by oil contamination and misfires resulting from internal engine damage. This further supports the likelihood of KSDS‑related engine failure. Kia corporate has not referenced documentation of any kind. They have not requested it, indicated they are awaiting it, or provided guidance regarding its submission. Instead, corporate has repeatedly stated that they “must defer to the dealership,” despite the dealership’s failure to perform or submit the required KSDS diagnostic materials.

Filed Jun 16, 2026 · Engine · 39,000 miles · CA

The contact owns a 2024 Kia Forte. The contact stated while driving at an undisclosed speed, the check engine warning light was illuminated and the "all cylinders misfiring" message was displayed on the instrument panel. The vehicle was taken to a dealer where it was diagnosed that there was bad fuel in the tank that needed to be drained. The vehicle was repaired however, the failure persisted. The vehicle was taken back to the dealer where it was diagnosed that there was diesel in the tank. The vehicle was repaired however, the failure persisted; the contact stated while driving at an undisclosed speed the vehicle loss automotive power while the accelerator pedal was depressed. A dealer was contacted however, the vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 39,000.

Filed May 4, 2026 · Engine · 113,922 miles · GA

The contact owns a 2017 KIA Forte. The contact stated while operating the vehicle at an undisclosed speed, the vehicle was misfiring, severely shaking and was losing motive power suddenly while operating on multiple constantly for about 3 weeks, and state she noticed a check engine warning light illuminated. The vehicle was driven to a independent mechanic where it was diagnosed to be a timing chain failure. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 113,922.

Filed Mar 30, 2026 · Electrical, Engine · LA

I am reporting a serious and ongoing safety issue involving my 2023 Kia Forte GT. The vehicle has experienced persistent mechanical problems, including a check engine light and multiple diagnostic trouble codes, including P0420 (catalyst system efficiency below threshold – Bank 1), P0300 (random/multiple cylinder misfire), P0304 (cylinder 4 misfire), and P0301 (cylinder 1 misfire). These codes have appeared as stored, pending, and permanent, indicating ongoing and unresolved engine and emissions system issues. In addition to these mechanical problems, the vehicle is emitting strong and concerning chemical fumes into the cabin during operation. These fumes are noticeable while driving and create a hazardous environment for occupants, raising concerns of toxic exposure and making the vehicle unsafe to operate. The vehicle also exhibits drivability issues, including jerking and performance irregularities when accelerating. Despite multiple attempts to have the vehicle diagnosed and repaired under warranty at authorized Kia dealerships, including All Star Kia East and All Star Kia Seigen Lane, the dealerships have refused to properly diagnose or repair the vehicle. I have been informed that my vehicle or account is “flagged in all systems,” and service has been denied on that basis. The refusal to address an emissions-related defect, combined with active misfires and the presence of chemical fumes entering the cabin, presents a serious safety risk. I am requesting that this issue be investigated as a potential safety defect affecting this vehicle.

Filed Jan 5, 2026 · Engine · 137,408 miles · GA

The contact owns a 2014 Kia Forte. The contact stated that while attempting to start the vehicle, the vehicle failed to start. In addition, the contact stated that sometimes after the vehicle was started, the engine shut off unexpectedly. The vehicle was towed to an independent mechanic, where it was diagnosed with engine misfire and engine issues. In addition, the contact was informed that the check engine warning light was illuminated; however, the check engine warning light was off. The contact was informed of the federal safety agency Campaign Numbers: 17V773000 (Service Brakes, Hydraulic) and 20V750000 (Engine). The contact was advised to take the vehicle to the dealer because of the open recalls. The vehicle was towed to the dealer; however, the vehicle was not inspected. The vehicle was not repaired. The contact stated that the vehicle was inoperable. The manufacturer was made aware of the failure but provided no assistance. The contact was informed of the unrepaired recalls; however, the failure of the vehicle was not related to the recall repairs. The failure mileage was approximately 137,408.

Filed Dec 18, 2025 · Engine, Fuel system · WA

The vehicle began experiencing persistent engine misfires and rough running. Fuel contamination was found in the engine oil, and the spark plugs were fouled with oil and fuel. The catalytic converter has become clogged and failed multiple times due to excess fuel and oil entering the exhaust system. The Kia dealership documented these conditions but refused to perform recall-related engine repairs. Kia Consumer Affairs stated the vehicle does not meet warranty extension guidelines and would not repair the engine. Due to fuel in the oil, misfires, overheating exhaust components, and repeated catalytic converter failure, the vehicle is unsafe to drive and presents a potential fire risk.

Filed Jul 24, 2025 · Engine, Transmission · IL

1. the federal safety agency Safety Complaint Draft Vehicle Info: Make: Kia Model: Forte5 SX Year: 2016 VIN: [XXX] Engine: 1.6L GDI (G4FJ Nu engine) Issue: This vehicle uses the 1.6L GDI Nu engine (engine code G4FJ), which is the same engine involved in Kia’s engine defect recalls and class action settlements related to connecting rod bearing failure and engine seizure risks. However, Kia is refusing to provide the Knock Sensor Detection System (KSDS) update, and no internal campaigns or recalls are listed for my VIN despite the identical mechanical risk. I purchased the vehicle in 2017 and was unaware of the extended warranty and safety campaigns until now. I am experiencing symptoms of rough idle and pre-knock concerns, and yet Kia and my local dealership are unwilling to escalate my case or even verify warranty eligibility. This defect poses a risk of sudden engine failure and should be addressed under expanded recall coverage. I am requesting the federal safety agency investigate inclusion of later-production 2016 vehicles like mine, which clearly share the same defective power train. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed May 10, 2025 · Acceleration, Engine · MN

The engine in my 2015 Kia Forte (VIN: [XXX] ) experienced failure tied to recall code P1326, which is associated with bearing wear and potential engine seizure. The vehicle entered limp mode around [XXX] at 152,170 miles, despite early signs of failure starting at 131,000 miles. These included loss of power, rough idle, and a check engine light (CEL) which triggered the P1326 code confirmed by both a pre-scan and Kia dealership. System that failed: The engine and powertrain system. Issue stems from rod bearing wear as identified in Kia’s engine class-action settlement. Vehicle is available for inspection upon request. Safety risk: Limp mode drastically reduced engine power on a main road. I could not safely accelerate, which created a hazard in traffic. Additionally, oil loss was confirmed on multiple occasions, and misfire codes were detected. This could have led to engine stall or seizure if I continued driving. Was issue confirmed by a dealer or service center? Yes. Lupient Kia confirmed P1326 at 133,703 miles. Luther Kia later confirmed limp mode and conducted a diagnostic at 152,170 miles. Was vehicle/component inspected by others? Yes. Jiffy Lube documented "no oil on stick" at 130,367 miles. O’Reilly Auto and Economy Muffler later confirmed related secondary issues. Were there symptoms or warnings prior to failure? Yes. CEL appeared at 131,000 miles. Knock sensor was replaced at 131,165 miles. P1326 and oil loss symptoms were consistently documented between April 2024 and April 2025. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Mar 7, 2025 · Engine · 150,000 miles · IN

The contact owns a 2018 Kia Forte. The contact stated that while driving 35, the vehicle slowed down, there was an engine misfire, and the vehicle stalled. There were no warning lights illuminated. The contact called the local dealer, but the vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 150,000.

Filed Apr 30, 2024 · Engine · 72,000 miles · CA

The contact owns a 2014 Kia Forte. The contact received notification of the federal safety agency Campaign Number: 20V705000 (Engine and Engine Cooling) however, the part to do the recall repair was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The contact stated that while driving at an undisclosed speed, the check engine warning light illuminated, and the vehicle started making an abnormal sound. The contact turned off and restarted the vehicle, but the sound persisted prior to the vehicle stalling. The contact stated an independent mechanic diagnosed the vehicle with a piston misfire. The vehicle could not be restarted. The dealer was made aware of the failure but confirmed that parts were not yet available. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 72,000. The VIN was not provided.